AI-generatedSaint John at a glance
- Best time
- Jul – Aug
- Warmest month
- Aug · 21°
- Warmest sea
- Aug · 14.2°
- Sunshine a year
- 2,000 h
- Rain a year
- 1,356 mm
- Climate
- Continental
- Time zone
- UTC−4 / UTC−3
- Elevation
- 30 m
Climate in Saint John
Saint John has warm to hot summers and cold winters with occasional snow. August is the warmest month with average highs of 21 °C, while January is the coolest at −2 °C. With around 2,000 hours of sunshine a year, Saint John is moderately sunny; July is the sunniest month with 6.9 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: July – August
A typical day in October
- Morning, 08:00: about 7°
- Midday, 13:00: about 12°
- Afternoon, 16:00: about 12°
- Evening, 20:00: about 10°
- Night, 23:00: about 9°
07:3918:41
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:20–08:19 · evening 18:01–18:59
- Blue hour
- Morning 07:09–07:20 · evening 18:59–19:11
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 Saint John in October?
In October, Saint John is cool: daytime highs average 13 °C, and nights cool down to about 7 °C. The sea averages 11.9 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 133 mm in total. All in all, October is not an ideal month for a holiday in Saint John.
More details for October
- Daylight
- 11 h 3 min07:39 – 18:41
- UV index
- 3 · 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
- 59 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−3America/Moncton
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %30 %
- Few rainy daysweight 20 %51 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Saint John
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 10.9 – 12.9 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Saint John ranges from 2.6 °C in March to 14.2 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
From November to March 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 13.0 and 15.3 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 5.1° | 3.8° | 6.3° | cold |
| FebruaryFeb | 3.3° | 2.1° | 4.7° | cold |
| MarchMar | 2.6° | 1.3° | 3.9° | cold |
| AprilApr | 3.7° | 2.4° | 5.1° | cold |
| MayMay | 6.4° | 4.7° | 7.7° | cold |
| JuneJun | 9.7° | 8.3° | 11.0° | cold |
| JulyJul | 12.8° | 11.4° | 14.0° | cold |
| AugustAug | 14.2° | 13.0° | 15.3° | cold |
| SeptemberSep | 13.5° | 12.3° | 14.6° | cold |
| OctoberOct | 11.9° | 10.9° | 12.9° | cold |
| NovemberNov | 10.0° | 8.9° | 11.3° | cold |
| DecemberDec | 7.8° | 6.6° | 8.9° | cold |
Sunshine hours in Saint John
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 4.8 of 11.0 hours of daylight in Saint John, 44 % 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 Saint John
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · 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 45 min
- Fair skin
- about 55 min
- Light brown skin
- about 80 min
- Olive skin
- about 100 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 Saint John: 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, Saint John has about 11 rainy days with 133 mm of rain in total.
Wind and clouds in Saint John
How breezy and how cloudy Saint John 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 Saint John 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: Sep – Jul.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 59 % of the sky over Saint John: variable cloud, with about 4.8 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.
Snow in Saint John
When Saint John is likely to be white: 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 Saint John.
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 Saint John
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°
ColdOctober: nights around 7°. The room should be heated.
The coolest nights are in January (−10°), the warmest in August (15°). Nights are pleasant for sleeping (15 to 20 °C) from July to August. Nights fall below 8 °C on average from October to May, so the room should be heated.
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 | 12 | −2° | −10° | 5.1° | 4.0 h | 12 | 116 |
| FebruaryFeb | 17 | −1° | −9° | 3.3° | 5.0 h | 11 | 100 |
| MarchMar | 17 | 2° | −5° | 2.6° | 5.5 h | 12 | 117 |
| AprilApr | 18 | 8° | 1° | 3.7° | 6.0 h | 13 | 111 |
| MayMay | 20 | 14° | 6° | 6.4° | 6.6 h | 13 | 106 |
| JuneJun | 20 | 18° | 11° | 9.7° | 6.7 h | 13 | 109 |
| JulyJul | 34 | 21° | 15° | 12.8° | 6.9 h | 12 | 98 |
| AugustAug | 36 | 21° | 15° | 14.2° | 6.6 h | 10 | 89 |
| SeptemberSep | 22 | 18° | 12° | 13.5° | 6.1 h | 10 | 111 |
| OctoberOct | 16 | 13° | 7° | 11.9° | 4.8 h | 11 | 133 |
| NovemberNov | 12 | 7° | 1° | 10.0° | 3.8 h | 11 | 126 |
| DecemberDec | 9 | 2° | −5° | 7.8° | 3.6 h | 13 | 140 |
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
45.27° N, 66.06° W · 30 m · America/Moncton
Best time to visit Saint John
The best time to visit Saint John is from July to August. The sea stays too cool for a classic beach holiday: even in August it only reaches 14.2 °C. For sightseeing, day trips and hiking, conditions are most comfortable from July to September. Rain is most frequent from April to June and from December to January; the wettest month is December with 140 mm.
Saint John through the seasons
How the weather changes over the seasons, with averages for each.
Saint John in spring
Mar – May
Poor
- 2–14 °C by day
- Sea 4 °C
- 6 h of sun a day
- 37 rainy days in all
Saint John in summer
Jun – Aug
Poor
- 18–21 °C by day
- Sea 12 °C
- 7 h of sun a day
- 34 rainy days in all
Saint John in autumn
Sep – Nov
Poor
- 7–18 °C by day
- Sea 12 °C
- 5 h of sun a day
- 32 rainy days in all
Saint John in winter
Dec – Feb
Poor
- -2–2 °C by day
- Sea 5 °C
- 4 h of sun a day
- 36 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Saint John for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Compare two months in Saint John
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Saint John: score 36 against 16. In August, days are 8 °C warmer than in October. The sea is 2 °C warmer in August. August has one rainy day fewer. The sun shines 2 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Weather score | 16 | 36better |
| Day high | 13° | 21° |
| Night low | 7° | 15° |
| Sea | 11.9° | 14.2° |
| Sunshine | 4.8 h | 6.6 hbetter |
| Rainy days | 11 | 10better |
| Rainfall | 133 mm | 89 mmbetter |
| Muggy days | 0better | 2 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Jul – Sep
15–28 °C and not too much rain
Rainy months
Apr – Jun, Dec – Jan
12 or more rainy days
Snow
Dec – Apr
Snow on 2 or more days
Saint John month by month
The typical weather for every month at a glance.
12January-2° · Sea 5° · 4 h
In January, Saint John is freezing cold: daytime highs average −2 °C, and nights often drop below freezing (−10 °C). The sea averages 5.1 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Precipitation, often as snow, falls on about 12 days, totalling 116 mm. Snow falls on about 7 days. It is often windy, with gusts of around 30 km/h. All in all, January is not an ideal month for a holiday in Saint John.
Saint John in January17February-1° · Sea 3° · 5 h
In February, Saint John is freezing cold: daytime highs average −1 °C, and nights often drop below freezing (−9 °C). The sea averages 3.3 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Precipitation, often as snow, falls on about 11 days, totalling 100 mm. Snow falls on about 7 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 Saint John.
Saint John in February17March2° · Sea 3° · 6 h
In March, Saint John is freezing cold: daytime highs average 2 °C, and nights often drop below freezing (−5 °C). The sea averages 2.6 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Precipitation, often as snow, falls on about 12 days, totalling 117 mm. Snow falls on about 6 days. All in all, March is not an ideal month for a holiday in Saint John.
Saint John in March18April8° · Sea 4° · 6 h
In April, Saint John is cold: daytime highs average 8 °C, and nights cool down to about 1 °C. The sea averages 3.7 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 111 mm in total. Snow falls on about 3 days. All in all, April is not an ideal month for a holiday in Saint John.
Saint John in April20May14° · Sea 6° · 7 h
In May, Saint John is cool: daytime highs average 14 °C, and nights cool down to about 6 °C. The sea averages 6.4 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 106 mm in total. All in all, May is not an ideal month for a holiday in Saint John.
Saint John in May20June18° · Sea 10° · 7 h
In June, Saint John is mild: daytime highs average 18 °C, and nights cool down to about 11 °C. The sea averages 9.7 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 109 mm in total. All in all, June is not an ideal month for a holiday in Saint John.
Saint John in June34July21° · Sea 13° · 7 h
In July, Saint John is warm: daytime highs average 21 °C, and nights cool down to about 15 °C. The sea averages 12.8 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 12 rainy days and 98 mm in total. All in all, July is not an ideal month for a holiday in Saint John.
Saint John in July36August21° · Sea 14° · 7 h
In August, Saint John is warm: daytime highs average 21 °C, and nights cool down to about 15 °C. The sea averages 14.2 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 89 mm in total. All in all, August is not an ideal month for a holiday in Saint John.
Saint John in August22September18° · Sea 14° · 6 h
In September, Saint John is mild: daytime highs average 18 °C, and nights cool down to about 12 °C. The sea averages 13.5 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 111 mm in total. All in all, September is not an ideal month for a holiday in Saint John.
Saint John in September16October13° · Sea 12° · 5 h
In October, Saint John is cool: daytime highs average 13 °C, and nights cool down to about 7 °C. The sea averages 11.9 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 133 mm in total. All in all, October is not an ideal month for a holiday in Saint John.
Saint John in October12November7° · Sea 10° · 4 h
In November, Saint John is cold: daytime highs average 7 °C, and nights cool down to about 1 °C. The sea averages 10.0 °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 126 mm in total. Snow falls on about 2 days. It is often windy, with gusts of around 28 km/h. All in all, November is not an ideal month for a holiday in Saint John.
Saint John in November9December2° · Sea 8° · 4 h
In December, Saint John is freezing cold: daytime highs average 2 °C, and nights often drop below freezing (−5 °C). The sea averages 7.8 °C – swimming is only for the hardy. The sun is scarce, with only about 4 hours a day. Precipitation, often as snow, falls on about 13 days, totalling 140 mm. Snow falls on about 6 days. It is often windy, with gusts of around 30 km/h. All in all, December is not an ideal month for a holiday in Saint John.
Saint John in DecemberSaint John compared
Put Saint John side by side with another destination.
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Saint John vs. Fredericton
In October the holiday weather in Saint John and Fredericton is about equally good (score 16 vs. 13). During the day Fredericton is 1 °C cooler than Saint John. Fredericton gets one hour less sunshine a day.
| in October | Saint John | Fredericton |
|---|---|---|
| Holiday score | 16 | 13 |
| Daytime high | 13° | 12° |
| Sea | 12° | – |
| Sunshine | 5 h | 4 h |
| Rainy days | 11 | 11 |
| Best time | Jul – Aug | May – Sep |
Through the year
Canada in October: the best places
In October, Saint John ranks 23 among the 31 nearest destinations in this country.
- Hamilton15°53
- 2Toronto14°52
- 3Niagara-on-the-Lake15°51
- 4Niagara Falls15°51
- 5London15°50
- 6Halifax14°14°49
- 7Collingwood (Blue Mountains)13°47
- 8Ottawa13°44
- 23Saint JohnThis page13°12°16
Planning a trip to Saint John
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Saint John 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.
Saint John has its best school-holiday weather during the summer holidays (score 35) and its weakest during the Christmas holidays (score 11).
- 18
Easter holidays
Mar – Apr
Poor
- 6 °C by day
- Sea 3 °C
- 5.9 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain, Snow
- 20
May half-term
May – Jun
Poor
- 14 °C by day
- Sea 7 °C
- 6.6 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 35
Summer holidays
Jul – Aug
PoorBest holidays
- 21 °C by day
- Sea 14 °C
- 6.7 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 16
October half-term
Oct
Poor
- 13 °C by day
- Sea 12 °C
- 4.8 h of sun a day
- 11 rainy days a month
- 11
Christmas holidays
Dec – Jan
Poor
- 0 °C by day
- Sea 6 °C
- 3.8 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 6 h 10 min
- Distance
- 4,730 km
- Time zone
- UTC−3
- Jet lag
- About 3 days (4 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.
Frequently asked questions about Saint John
When is the best time to visit Saint John?
The best time to visit Saint John 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 Saint John?
The sea temperature in Saint John ranges from 2.6 °C in March to 14.2 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Saint John in October?
Only if you don't mind cold water: in October the sea averages just 11.9 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Saint John?
August is the warmest month, with average highs of 21 °C and nights around 15 °C. January is the coolest month at −2 °C.
When does it rain most in Saint John?
Rain is most frequent from April to June and from December to January; the wettest month is December with 140 mm. The driest month is August with 89 mm.
How many hours of sunshine does Saint John get?
Saint John gets around 2,000 hours of sunshine a year. The sunniest month is July with 6.9 hours a day; in December there are 3.6 hours a day.
What time zone is Saint John in?
Saint John uses the time zone America/Moncton: UTC−4 in January and UTC−3 in July.
How long is the flight from London to Saint John?
A nonstop flight from London to Saint John takes about 6 h 10 min, for a straight-line distance of about 4,730 km.
Which school holidays are best for Saint John?
Saint John has its best school-holiday weather during the summer holidays (score 35) and its weakest during the Christmas holidays (score 11). Holiday ratings (0–100): Easter holidays 18, May half-term 20, Summer holidays 35, October half-term 16, Christmas holidays 11.
Near Saint John
Other destinations close by.
Places with a climate like Saint John
Destinations whose weather through the year is closest to Saint John's – good alternatives.