Castletown Weather in May

May in Castletown brings moderate temperatures, with highs of 12°C (54°F) and nights dropping to 7°C (45°F). Rainfall is on the higher side this month, averaging around 69 mm (2.7 in), so keep a rain jacket handy.

Rainfall in Castletown in May

Typically, you can expect about 17 days of rain this month, with 69 mm (2.7 in) on average. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.

Temperature in Castletown in May

Daytime temperatures in Castletown reach 12°C (54°F) in May, dropping to 7°C (45°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Castletown in May

The city usually sees around 195 hours of sunlight, indicating many sunny days despite the cool temperatures, making it a good month for sightseeing.

If you prefer dry days with pleasant temperatures, June, July, August and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.