Castletown Weather in May

May in Castletown typically sees daytime highs of 13°C (55°F) and nighttime lows of 9°C (48°F). With the least rainfall of the year, it's a reliably dry month.

Rainfall in Castletown in May

You can expect the least amount of rain of the year this month. The dry conditions are a bonus, even if the cooler temperatures mean you'll need to dress accordingly. Records from the past 30 years suggest around 15 days of rain, with 58 mm (2.3 in) average for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Castletown in May

In May, Castletown gets moderate temperatures, with highs of 13°C (55°F). Nights cool to around 9°C (48°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights fall to 9°C (48°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July, August and September typically offer the best weather for Castletown.