AI-generatedCastletown at a glance
- Best time
- May – Sep
- Warmest month
- Jul · 18°
- Warmest sea
- Aug · 14.9°
- Sunshine a year
- 1,650 h
- Rain a year
- 992 mm
- Climate
- Maritime
- Time zone
- UTC+0 / UTC+1
- Elevation
- 13 m
Climate in Castletown
Castletown has a maritime climate with moderate summers and cool, often grey winters. July is the warmest month with average highs of 18 °C, while February is the coolest at 9 °C. With around 1,650 hours of sunshine a year, Castletown is moderately sunny; May is the sunniest month with 7.6 hours a day.
Holiday weather through the year
Best time to visit Castletown
The best time to visit Castletown is from May to September. The sea stays too cool for a classic beach holiday: even in August it only reaches 14.9 °C. For sightseeing, day trips and hiking, conditions are most comfortable from June to July. Rain is frequent from October to March; the wettest month is November with 127 mm.
Castletown through the seasons
How the weather changes over the seasons, with averages for each.
Castletown in spring
Mar – May
Fair
- 10–15 °C by day
- Sea 9 °C
- 5.9 h of sun a day
- 35 rainy days in all
Castletown in summer
Jun – Aug
Good
- 17–18 °C by day
- Sea 14 °C
- 6.6 h of sun a day
- 35 rainy days in all
Castletown in autumn
Sep – Nov
Fair
- 11–17 °C by day
- Sea 14 °C
- 3.5 h of sun a day
- 49 rainy days in all
Castletown in winter
Dec – Feb
Poor
- 9 °C by day
- Sea 9 °C
- 2.1 h of sun a day
- 50 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Jun – Jul
15–28 °C and not too much rain
Rainy months
Oct – Mar
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in Castletown for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Poor
Best time to visit: May – September
Where to go in OctoberSea temperature in October
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 10°
- Midday, 13:00: about 14°
- Afternoon, 16:00: about 14°
- Evening, 20:00: about 12°
- Night, 23:00: about 11°
07:4418:24
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 07:22–08:33 · evening 17:35–18:46
- Blue hour
- Morning 07:09–07:22 · evening 18:46–19:00
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.
October in Castletown compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 15° at the start of the month to 13° at the end. The sea cools from 14° to 13°. The days get 2.1 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 15° | 13° |
| Night-time low | 10° | 8° |
| Sea | 14° | 13° |
| Daylight | 11.7 h | 9.6 h |
What is the weather like in Castletown in October?
In October, Castletown is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 13.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3.4 hours a day. It rains often – on about 17 days, adding up to 119 mm. It is often windy: on a typical day the wind peaks at around 41 km/h. All in all, October is not an ideal month for a holiday in Castletown.
More details for October
- Daylight
- 10 h 40 min07:44 – 18:24
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 41 km/haverage daily peakAll months
- Cloud cover
- 72 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1offset from UTC
How the score comes together
- Temperatureweight 50 %67 %
- Sunshineweight 20 %7 %
- Few rainy daysweight 30 %10 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Compare two months in Castletown
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
June has the better holiday weather in Castletown: score 78 against 38. In June, days are 3 °C warmer than in October. The sea is 2 °C cooler in June. June has 6 fewer rainy days. The sun shines 4 hours longer a day in June.
| Month | October | June |
|---|---|---|
| Holiday weather score | 38 | 78better |
| Daytime high | 14° | 17° |
| Night-time low | 9° | 11° |
| Sea | 13.9° | 12.3° |
| Sunshine | 3.4 h | 7.1 hbetter |
| Rainy days | 17 | 11better |
| Rainfall | 119 mm | 62 mmbetter |
Based on the climate averages 1996–2025.
Castletown month by month
The typical weather for every month at a glance.
7January9° · Sea 9° · 1.8 h
In January, Castletown is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 9.2 °C – swimming is only for the hardy. The sun is scarce, with only about 1.8 hours a day. It rains often – on about 17 days, adding up to 95 mm. It is often windy: on a typical day the wind peaks at around 44 km/h. All in all, January is not an ideal month for a holiday in Castletown.
Castletown in January12February9° · Sea 8° · 2.9 h
In February, Castletown is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sea averages 8.3 °C – swimming is only for the hardy. The sun is scarce, with only about 2.9 hours a day. Rain is frequent, with about 14 rainy days and 73 mm in total. It is often windy: on a typical day the wind peaks at around 43 km/h. All in all, February is not an ideal month for a holiday in Castletown.
Castletown in February23March10° · Sea 8° · 4.1 h
In March, Castletown is cold: daytime highs average 10 °C, and nights cool down to about 5 °C. The sea averages 8.0 °C – swimming is only for the hardy. Expect around 4.1 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 65 mm in total. It is often windy: on a typical day the wind peaks at around 39 km/h. All in all, March is not an ideal month for a holiday in Castletown.
Castletown in March46April12° · Sea 9° · 6.1 h
In April, Castletown is cool: daytime highs average 12 °C, and nights cool down to about 6 °C. The sea averages 8.7 °C – swimming is only for the hardy. Expect around 6.1 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 55 mm in total. It is often windy: on a typical day the wind peaks at around 35 km/h. All in all, April is a so-so month for a holiday in Castletown.
Castletown in April67May15° · Sea 10° · 7.6 h
In May, Castletown is cool: daytime highs average 15 °C, and nights cool down to about 8 °C. The sea averages 10.2 °C – swimming is only for the hardy. The sun shines for around 7.6 hours a day. Rain is frequent, with about 11 rainy days and 53 mm in total. It is often windy: on a typical day the wind peaks at around 33 km/h. All in all, May is a good month for a holiday in Castletown.
Castletown in May78June17° · Sea 12° · 7.1 h
In June, Castletown is mild: daytime highs average 17 °C, and nights cool down to about 11 °C. The sea averages 12.3 °C – swimming is only for the hardy. The sun shines for around 7.1 hours a day. Rain is frequent, with about 11 rainy days and 62 mm in total. It is often windy: on a typical day the wind peaks at around 32 km/h. All in all, June is a good month for a holiday in Castletown.
Castletown in June76July18° · Sea 14° · 6.6 h
In July, Castletown is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 14.0 °C – swimming is only for the hardy. The sun shines for around 6.6 hours a day. Rain is frequent, with about 12 rainy days and 63 mm in total. It is often windy: on a typical day the wind peaks at around 31 km/h. All in all, July is a good month for a holiday in Castletown.
Castletown in July71August18° · Sea 15° · 6.1 h
In August, Castletown is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 14.9 °C – swimming is only for the hardy. Expect around 6.1 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 73 mm in total. It is often windy: on a typical day the wind peaks at around 32 km/h. All in all, August is a good month for a holiday in Castletown.
Castletown in August66September17° · Sea 15° · 4.9 h
In September, Castletown is mild: daytime highs average 17 °C, and nights cool down to about 12 °C. The sea averages 14.8 °C – swimming is only for the hardy. Expect around 4.9 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 87 mm in total. It is often windy: on a typical day the wind peaks at around 36 km/h. All in all, September is a good month for a holiday in Castletown.
Castletown in September38October14° · Sea 14° · 3.4 h
In October, Castletown is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 13.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3.4 hours a day. It rains often – on about 17 days, adding up to 119 mm. It is often windy: on a typical day the wind peaks at around 41 km/h. All in all, October is not an ideal month for a holiday in Castletown.
Castletown in October18November11° · Sea 12° · 2.1 h
In November, Castletown is cool: daytime highs average 11 °C, and nights cool down to about 7 °C. The sea averages 12.3 °C – swimming is only for the hardy. The sun is scarce, with only about 2.1 hours a day. It rains often – on about 19 days, adding up to 127 mm. It is often windy: on a typical day the wind peaks at around 44 km/h. All in all, November is not an ideal month for a holiday in Castletown.
Castletown in November8December9° · Sea 11° · 1.5 h
In December, Castletown is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 10.6 °C – swimming is only for the hardy. The sun is scarce, with only about 1.5 hours a day. It rains often – on about 19 days, adding up to 120 mm. It is often windy: on a typical day the wind peaks at around 45 km/h. All in all, December is not an ideal month for a holiday in Castletown.
Castletown in DecemberClimate in detail
Year & climate table
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Castletown
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
CoolOctober: nights around 9°. A duvet at night and a jumper for the evening.
The coolest nights are in February (4°), the warmest in August (13°). Nights fall below 8 °C on average from November to April, 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 | 7 | 9° | 5° | 9.2° | 1.8 h | 17 | 95 |
| FebruaryFeb | 12 | 9° | 4° | 8.3° | 2.9 h | 14 | 73 |
| MarchMar | 23 | 10° | 5° | 8.0° | 4.1 h | 13 | 65 |
| AprilApr | 46 | 12° | 6° | 8.7° | 6.1 h | 11 | 55 |
| MayMay | 67 | 15° | 8° | 10.2° | 7.6 h | 11 | 53 |
| JuneJun | 78 | 17° | 11° | 12.3° | 7.1 h | 11 | 62 |
| JulyJul | 76 | 18° | 13° | 14.0° | 6.6 h | 12 | 63 |
| AugustAug | 71 | 18° | 13° | 14.9° | 6.1 h | 13 | 73 |
| SeptemberSep | 66 | 17° | 12° | 14.8° | 4.9 h | 13 | 87 |
| OctoberOct | 38 | 14° | 9° | 13.9° | 3.4 h | 17 | 119 |
| NovemberNov | 18 | 11° | 7° | 12.3° | 2.1 h | 19 | 127 |
| DecemberDec | 8 | 9° | 5° | 10.6° | 1.5 h | 19 | 120 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), 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
54.07° N, 4.65° W · 13 m · Europe/Isle_of_Man
Sea temperature
Sea temperature in Castletown
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 13.5 – 14.3 °C
Swimming season: Always below 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Castletown ranges from 8.0 °C in March to 14.9 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
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 14.6 and 15.4 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 9.2° | 8.5° | 9.8° | cold |
| FebruaryFeb | 8.3° | 7.6° | 9.0° | cold |
| MarchMar | 8.0° | 7.3° | 8.9° | cold |
| AprilApr | 8.7° | 8.0° | 9.3° | cold |
| MayMay | 10.2° | 9.6° | 11.0° | cold |
| JuneJun | 12.3° | 11.5° | 13.0° | cold |
| JulyJul | 14.0° | 13.5° | 14.6° | cold |
| AugustAug | 14.9° | 14.6° | 15.4° | cold |
| SeptemberSep | 14.8° | 14.2° | 15.3° | cold |
| OctoberOct | 13.9° | 13.5° | 14.3° | cold |
| NovemberNov | 12.3° | 11.7° | 13.0° | cold |
| DecemberDec | 10.6° | 10.0° | 11.2° | cold |
Sunshine
Sunshine hours in Castletown
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 3.4 of 10.7 hours of daylight in Castletown, 32 % of the daylight hours.
Sunshine hours: measured at the weather station 2 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
Rain
Rain in Castletown: 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, Castletown has about 17 rainy days with 119 mm of rain in total.
UV index
UV index in Castletown
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 7).
Minutes until sunburn in October
- Very fair skin
- about 85 min
- Fair skin
- about 105 min
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, 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.
Wind & clouds
Wind and clouds in Castletown
How breezy and how cloudy Castletown 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 Castletown typically peaks at 41 km/h during the day: Beaufort 6, strong 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 is that strong all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 72 % of the sky over Castletown: mostly cloudy, with about 3.4 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.
Planning a trip to Castletown
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Castletown 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.
Castletown has its best school-holiday weather during the summer holidays (score 73) and its weakest during the Christmas holidays (score 8).
- 39
Easter holidays
Mar – Apr
Poor
- 11 °C by day
- Sea 8 °C
- 5.5 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
- 69
May half-term
May – Jun
Good
- 15 °C by day
- Sea 11 °C
- 7.5 h of sun a day
- 11 rainy days a month
- 73
Summer holidays
Jul – Aug
GoodBest holidays
- 18 °C by day
- Sea 15 °C
- 6.3 h of sun a day
- 12 rainy days a month
- 38
October half-term
Oct
Poor
- 14 °C by day
- Sea 14 °C
- 3.4 h of sun a day
- 17 rainy days a month
Keep in mind: Frequent rain
- 8
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- Sea 10 °C
- 1.7 h of sun a day
- 18 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- Short trip – train or car is often quicker
- Distance
- 400 km
- Time zone
- UTC+1
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Good to know: Isle of Man
- Currency
- British Pound (GBP)
- Languages
- English, Manx
- Sockets
- Type G · 230 V
- Traffic
- Drives on the left
- Dialling code
- +44 1624
- Emergency number
- 999 · 112
UK plugs fit
Sources: GeoNames (CC BY 4.0) and Wikidata (CC0). Please check details before you travel.
Compare & alternatives
Compare with another place
Castletown compared
Put Castletown side by side with another destination.
Castletown vs Port Erin
In October the holiday weather in Castletown and Port Erin is about equally good (score 38 vs 37). During the day it is about as warm in Port Erin as in Castletown. The sea is about equally warm.
| in October | Castletown | Port Erin |
|---|---|---|
| Holiday weather score | 38 | 37 |
| Daytime high | 14° | 14° |
| Sea | 14° | 14° |
| Sunshine | 3 h | 3 h |
| Rainy days | 17 | 17 |
| Best time | May – Sep | May – Sep |
Through the year
Best places in the country
Isle of Man in October: the best places
In October, Castletown ranks 1 of 6 destinations in this country.
- CastletownThis page14°14°38
- 2Port Erin14°14°37
- 3Peel14°14°37
- 4Ramsey14°14°37
- 5Laxey14°14°36
- 6Douglas14°14°33
Places nearby
Near Castletown
Other destinations close by.
Places with a similar climate
Places with a climate like Castletown
Destinations whose weather through the year is closest to Castletown's – good alternatives.
Frequently asked questions about Castletown
When is the best time to visit Castletown?
The best time to visit Castletown is from May to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Castletown?
The sea temperature in Castletown ranges from 8.0 °C in March to 14.9 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Castletown in October?
Only if you don't mind cold water: in October the sea averages just 13.9 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Castletown?
July is the warmest month, with average highs of 18 °C and nights around 13 °C. February is the coolest month at 9 °C.
When does it rain most in Castletown?
Rain is frequent from October to March; the wettest month is November with 127 mm. The driest month is May with 53 mm.
How many hours of sunshine does Castletown get?
Castletown gets around 1,650 hours of sunshine a year. The sunniest month is May with 7.6 hours a day; in December there are 1.5 hours a day.
What time zone is Castletown in?
Castletown is on UTC+0 in January and UTC+1 in July.
Which school holidays are best for Castletown?
Castletown has its best school-holiday weather during the summer holidays (score 73) and its weakest during the Christmas holidays (score 8). Holiday ratings (0–100): Easter holidays 39, May half-term 69, summer holidays 73, October half-term 38, Christmas holidays 8.