Castletown Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castletown.
Climate overview of Castletown
The climate in Castletown, Isle of Man, United Kingdom, sees a moderate range of temperatures across the year, from 17°C (63°F) in August down to 9°C (48°F) in February.
With around 1085 mm (43 in) of annual rainfall, Castletown has a notably wet climate. The wettest month is November.
Castletown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castletown - and find the best time to visit.
Monthly Temperature in Castletown
The weather in Castletown changes moderately throughout the year, offering enough variation to appreciate each season. Average daytime temperatures reach a moderate 17°C (63°F) in August. In February, the coolest month of the year, temperatures drop to a chilly 9°C (48°F).
At night, temperatures range from around 14°C (57°F) in August to 6°C (43°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castletown
Castletown experiences significant rainfall throughout the year, averaging 1085 mm (43 in) of precipitation annually. Castletown can be quite wet during November, receiving approximately 135 mm (5.3 in) of precipitation over 19 rainy days.
In contrast, during the driest month (May), you will experience much drier conditions, with 58 mm (2.3 in) of precipitation spread across 15 rainy days. For more details, please visit our Castletown Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Castletown
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July, August and September
Frequently asked questions about the climate in Castletown
What is the best time to visit Castletown?
June, July, August and September typically offer the most optimal weather in Castletown. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Castletown?
Daytime highs range from 9°C (48°F) in February to 17°C (63°F) in August. Nighttime lows range from 6°C (43°F) to 14°C (57°F).
How much rain does Castletown get?
Annual rainfall is around 1085 mm (43 in). November is the wettest month with 135 mm (5.3 in), while May is the driest with 58 mm (2.3 in).
Castletown 3-Day Forecast
Castletown 3-Day Forecast
Castletown on the map
Castletown is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
London
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21°C (70°F) Edinburgh
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