AI-generatedHyannis, Cape Cod at a glance
- Best time
- Jul – Aug
- Warmest month
- Jul · 23°
- Warmest sea
- Aug · 21.0°
- Sunshine a year
- 2,210 h
- Rain a year
- 1,110 mm
- Climate
- Maritime
- Time zone
- UTC−5 / UTC−4
- Elevation
- 9 m
Climate in Hyannis, Cape Cod
Hyannis, Cape Cod has a maritime climate with moderate summers and cool, often grey winters. July is the warmest month with average highs of 23 °C, while January is the coolest at 3 °C. With around 2,210 hours of sunshine a year, Hyannis, Cape Cod is sunny; July is the sunniest month with 8.2 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: July – August
October is the peak of the hurricane season
Good forSightseeing & walks
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 13°
- Midday, 13:00: about 15°
- Afternoon, 16:00: about 15°
- Evening, 20:00: about 14°
- Night, 23:00: about 13°
06:5218:02
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:35–07:29 · evening 17:24–18:19
- Blue hour
- Morning 06:24–06:35 · evening 18:19–18:30
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Hyannis, Cape Cod in October?
In October, Hyannis, Cape Cod is cool: daytime highs average 16 °C, and nights cool down to about 12 °C. The sea averages 15.4 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 113 mm in total. All in all, October is not an ideal month for a holiday in Hyannis, Cape Cod.
More details for October
- Daylight
- 11 h 10 min06:52 – 18:02
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 26 km/haverage daily peakAll months
- Cloud cover
- 53 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 20 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Hyannis, Cape Cod
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 14.3 – 16.5 °C
Swimming season: Aug
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Hyannis, Cape Cod ranges from 2.8 °C in February to 21.0 °C in August. It is warm enough for a comfortable swim (20 °C and more) in August.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. From November to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 19.0 and 22.7 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 4.2° | 2.9° | 5.5° | cold |
| FebruaryFeb | 2.8° | 1.8° | 3.9° | cold |
| MarchMar | 3.6° | 2.3° | 4.9° | cold |
| AprilApr | 6.8° | 5.4° | 8.1° | cold |
| MayMay | 10.9° | 9.0° | 12.5° | cold |
| JuneJun | 15.7° | 13.9° | 17.8° | cold |
| JulyJul | 19.9° | 17.4° | 21.9° | fresh |
| AugustAug | 21.0° | 19.0° | 22.7° | refreshing |
| SeptemberSep | 19.3° | 17.7° | 20.8° | fresh |
| OctoberOct | 15.4° | 14.3° | 16.5° | cold |
| NovemberNov | 10.9° | 10.0° | 11.7° | cold |
| DecemberDec | 7.0° | 5.7° | 8.4° | cold |
Sunshine hours in Hyannis, Cape Cod
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.4 of 11.2 hours of daylight in Hyannis, Cape Cod, 48 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Hyannis, Cape Cod
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 4 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 35 min
- Fair skin
- about 45 min
- Light brown skin
- about 65 min
- Olive skin
- about 80 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Hyannis, Cape Cod: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Hyannis, Cape Cod has about 9 rainy days with 113 mm of rain in total.
Wind and clouds in Hyannis, Cape Cod
How breezy and how cloudy Hyannis, Cape Cod is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Hyannis, Cape Cod typically peaks at 26 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it gets there all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 53 % of the sky over Hyannis, Cape Cod: variable cloud, with about 5.4 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Hyannis, Cape Cod
How often the day gets hot in Hyannis, Cape Cod (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Hyannis, Cape Cod has about 0 hot days, with an average daytime high of 16 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Hyannis, Cape Cod
Snow is possible in Hyannis, Cape Cod, but no month makes it likely: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Hyannis, Cape Cod.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Hyannis, Cape Cod
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- muggy month (10+ muggy days)
CoolOctober: nights around 12°. A duvet at night and a jumper for the evening.
The coolest nights are in January (−2°), the warmest in August (20°). Tropical nights of 20 °C and more are the rule from July to August; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in June and in September. Nights fall below 8 °C on average from November to April, so the room should be heated. It is muggy (dew point 18 °C or more) on about 45 days a year, mostly from July to August.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 14 | 3° | −2° | 4.2° | 4.2 h | 11 | 105 |
| FebruaryFeb | 17 | 4° | −1° | 2.8° | 4.9 h | 10 | 89 |
| MarchMar | 20 | 6° | 1° | 3.6° | 5.9 h | 11 | 108 |
| AprilApr | 22 | 10° | 6° | 6.8° | 6.6 h | 11 | 98 |
| MayMay | 24 | 14° | 10° | 10.9° | 7.1 h | 11 | 85 |
| JuneJun | 31 | 19° | 16° | 15.7° | 7.9 h | 9 | 77 |
| JulyJul | 66 | 23° | 20° | 19.9° | 8.2 h | 9 | 70 |
| AugustAug | 66 | 23° | 20° | 21.0° | 7.5 h | 9 | 74 |
| SeptemberSep | 40 | 20° | 17° | 19.3° | 6.4 h | 9 | 94 |
| OctoberOct | 20 | 16° | 12° | 15.4° | 5.4 h | 9 | 113 |
| NovemberNov | 18 | 11° | 6° | 10.9° | 4.5 h | 9 | 91 |
| DecemberDec | 13 | 6° | 2° | 7.0° | 3.9 h | 11 | 109 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
41.65° N, 70.28° W · 9 m · America/New_York
Best time to visit Hyannis, Cape Cod
The best time to visit Hyannis, Cape Cod is from July to August. For a beach holiday with the sea above 21 °C, go in August. For sightseeing, day trips and hiking, conditions are most comfortable from June to October. The wettest month is October with 113 mm of precipitation.
Hyannis, Cape Cod through the seasons
How the weather changes over the seasons, with averages for each.
Hyannis, Cape Cod in spring
Mar – May
Poor
- 6–14 °C by day
- Sea 7 °C
- 7 h of sun a day
- 32 rainy days in all
Hyannis, Cape Cod in summer
Jun – Aug
Fair
- 19–23 °C by day
- Sea 19 °C
- 8 h of sun a day
- 26 rainy days in all
Hyannis, Cape Cod in autumn
Sep – Nov
Poor
- 11–20 °C by day
- Sea 15 °C
- 5 h of sun a day
- 27 rainy days in all
Hyannis, Cape Cod in winter
Dec – Feb
Poor
- 3–6 °C by day
- Sea 5 °C
- 4 h of sun a day
- 32 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Hyannis, Cape Cod for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Compare two months in Hyannis, Cape Cod
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Hyannis, Cape Cod: score 66 against 20. In July, days are 7 °C warmer than in October. The sea is 4 °C warmer in July. The sun shines 3 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Weather score | 20 | 66better |
| Day high | 16° | 23° |
| Night low | 12° | 20° |
| Sea | 15.4° | 19.9° |
| Sunshine | 5.4 h | 8.2 hbetter |
| Rainy days | 9 | 9 |
| Rainfall | 113 mm | 70 mmbetter |
| Muggy days | 0better | 18 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Aug
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Jun – Oct
15–28 °C and not too much rain
Snow
Dec – Mar
Snow on 2 or more days
Hyannis, Cape Cod month by month
The typical weather for every month at a glance.
14January3° · Sea 4° · 4 h
In January, Hyannis, Cape Cod is cold: daytime highs average 3 °C, and nights often drop below freezing (−2 °C). The sea averages 4.2 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Precipitation, often as snow, falls on about 11 days, totalling 105 mm. Snow falls on about 4 days. It is often windy, with gusts of around 29 km/h. All in all, January is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in January17February4° · Sea 3° · 5 h
In February, Hyannis, Cape Cod is cold: daytime highs average 4 °C, and nights often drop below freezing (−1 °C). The sea averages 2.8 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Precipitation, often as snow, falls on about 10 days, totalling 89 mm. Snow falls on about 4 days. It is often windy, with gusts of around 29 km/h. All in all, February is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in February20March6° · Sea 4° · 6 h
In March, Hyannis, Cape Cod is cold: daytime highs average 6 °C, and nights cool down to about 1 °C. The sea averages 3.6 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 108 mm in total. Snow falls on about 3 days. It is often windy, with gusts of around 29 km/h. All in all, March is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in March22April10° · Sea 7° · 7 h
In April, Hyannis, Cape Cod is cold: daytime highs average 10 °C, and nights cool down to about 6 °C. The sea averages 6.8 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 98 mm in total. All in all, April is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in April24May14° · Sea 11° · 7 h
In May, Hyannis, Cape Cod is cool: daytime highs average 14 °C, and nights cool down to about 10 °C. The sea averages 10.9 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 85 mm in total. All in all, May is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in May31June19° · Sea 16° · 8 h
In June, Hyannis, Cape Cod is mild: daytime highs average 19 °C, and nights cool down to about 16 °C. The sea averages 15.7 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 9 rainy days and 77 mm in total. All in all, June is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in June66July23° · Sea 20° · 8 h
In July, Hyannis, Cape Cod is warm: daytime highs average 23 °C, and nights cool down to about 20 °C. The sea averages 19.9 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain falls on about 9 days, adding up to 70 mm. The air is often humid and muggy. All in all, July is a good month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in July66August23° · Sea 21° · 8 h
In August, Hyannis, Cape Cod is warm: daytime highs average 23 °C, and nights cool down to about 20 °C. The sea averages 21.0 °C – refreshing for a swim. The sun shines for around 8 hours a day. Rain falls on about 9 days, adding up to 74 mm. The air is often humid and muggy. All in all, August is a good month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in August40September20° · Sea 19° · 6 h
In September, Hyannis, Cape Cod is mild: daytime highs average 20 °C, and nights cool down to about 17 °C. The sea averages 19.3 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain falls on about 9 days, adding up to 94 mm. All in all, September is a so-so month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in September20October16° · Sea 15° · 5 h
In October, Hyannis, Cape Cod is cool: daytime highs average 16 °C, and nights cool down to about 12 °C. The sea averages 15.4 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 113 mm in total. All in all, October is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in October18November11° · Sea 11° · 5 h
In November, Hyannis, Cape Cod is cool: daytime highs average 11 °C, and nights cool down to about 6 °C. The sea averages 10.9 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain falls on about 9 days, adding up to 91 mm. All in all, November is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in November13December6° · Sea 7° · 4 h
In December, Hyannis, Cape Cod is cold: daytime highs average 6 °C, and nights cool down to about 2 °C. The sea averages 7.0 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 11 rainy days and 109 mm in total. Snow falls on about 2 days. It is often windy, with gusts of around 29 km/h. All in all, December is not an ideal month for a holiday in Hyannis, Cape Cod.
Hyannis, Cape Cod in DecemberHyannis, Cape Cod compared
Put Hyannis, Cape Cod side by side with another destination.
No destination found
Hyannis vs. Edgartown
In October the holiday weather in Hyannis and Edgartown is about equally good (score 20 vs. 20). During the day it is about as warm in Edgartown as in Hyannis. The sea in Edgartown is 1 °C warmer.
| in October | Hyannis | Edgartown |
|---|---|---|
| Holiday score | 20 | 20 |
| Daytime high | 16° | 16° |
| Sea | 15° | 16° |
| Sunshine | 5 h | 5 h |
| Rainy days | 9 | 9 |
| Best time | Jul – Aug | Jul – Aug |
Through the year
USA in October: the best places
In October, Hyannis, Cape Cod ranks 26 among the 31 nearest destinations in this country.
- Raleigh22°84
- 2Richmond21°82
- 3Washington20°19°81
- 4Philadelphia19°18°79
- 5Baltimore19°18°79
- 6New York18°18°77
- 7Providence17°17°70
- 8Pittsburgh18°69
- 26HyannisThis page16°15°20
Planning a trip to Hyannis, Cape Cod
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Hyannis, Cape Cod in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Hyannis, Cape Cod has its best school-holiday weather during the summer holidays (score 66) and its weakest during the Christmas holidays (score 14).
- 21
Easter holidays
Mar – Apr
Poor
- 9 °C by day
- Sea 6 °C
- 6.4 h of sun a day
- 11 rainy days a month
Keep in mind: Snow
- 25
May half-term
May – Jun
Poor
- 15 °C by day
- Sea 12 °C
- 7.3 h of sun a day
- 10 rainy days a month
- 66
Summer holidays
Jul – Aug
GoodBest holidays
- 23 °C by day
- Sea 21 °C
- 7.7 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 20
October half-term
Oct
Poor
- 16 °C by day
- Sea 15 °C
- 5.4 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 14
Christmas holidays
Dec – Jan
Poor
- 5 °C by day
- Sea 6 °C
- 4.1 h of sun a day
- 11 rainy days a month
Keep in mind: Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 6 h 50 min
- Distance
- 5,240 km
- Time zone
- UTC−4
- Jet lag
- About 3 days (5 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Hyannis, Cape Cod lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Hyannis, Cape Cod
When is the best time to visit Hyannis, Cape Cod?
The best time to visit Hyannis, Cape Cod is from July to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Hyannis, Cape Cod?
The sea temperature in Hyannis, Cape Cod ranges from 2.8 °C in February to 21.0 °C in August. It is warm enough for a comfortable swim (20 °C and more) in August.
Can you swim in Hyannis, Cape Cod in October?
Only if you don't mind cold water: in October the sea averages just 15.4 °C. Comfortable swimming is possible in August.
What is the warmest month in Hyannis, Cape Cod?
July is the warmest month, with average highs of 23 °C and nights around 20 °C. January is the coolest month at 3 °C.
When does it rain most in Hyannis, Cape Cod?
The wettest month is October with 113 mm of precipitation. The driest month is July with 70 mm.
How many hours of sunshine does Hyannis, Cape Cod get?
Hyannis, Cape Cod gets around 2,210 hours of sunshine a year. The sunniest month is July with 8.2 hours a day; in December there are 3.9 hours a day.
What time zone is Hyannis, Cape Cod in?
Hyannis, Cape Cod uses the time zone America/New_York: UTC−5 in January and UTC−4 in July.
How long is the flight from London to Hyannis, Cape Cod?
A nonstop flight from London to Hyannis, Cape Cod takes about 6 h 50 min, for a straight-line distance of about 5,240 km.
When is hurricane season in Hyannis, Cape Cod?
Hyannis, Cape Cod lies in an area that Atlantic hurricanes can reach. The hurricane season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Hyannis, Cape Cod?
Hyannis, Cape Cod has its best school-holiday weather during the summer holidays (score 66) and its weakest during the Christmas holidays (score 14). Holiday ratings (0–100): Easter holidays 21, May half-term 25, Summer holidays 66, October half-term 20, Christmas holidays 14.
Near Hyannis, Cape Cod
Other destinations close by.
Places with a climate like Hyannis, Cape Cod
Destinations whose weather through the year is closest to Hyannis, Cape Cod's – good alternatives.