Weather in Galle in May

How May compares

May is the 4th warmest month of the year in Galle and ranks 28th of 134 destinations we compare for May - see where else is hot in May. Against London's average high of 16.6°C in May, Galle is 12.1°C warmer by day and 17.3°C warmer at night.

Daytime and night-time in May

The typical May day in Galle peaks at 28.7°C, but that is an average: the warmest 10% of days reach 29.8°C or more. About 100% of days top 25°C and 1 in 18 pass 30°C. Nights average 25.6°C; one night in ten drops to 24.8°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest May day here reached 31.2°C (1998-05-07) and the coldest night 24.2°C (1999-05-26).

Rain in May

Wet (more than 8 rainy days): about 30 days with 1 mm or more, 305 mm in total. Year to year it varies a lot - the wettest May was 2016 with 667 mm, the driest 2012 with 123 mm. Humidity averages 86%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in May

The sea averages 28.9°C - warm enough to swim (22°c+). Depending on the year it ranges from 28.4°C to 29.5°C. For the warmest sea here, come in April (29.5°C).

Sunshine and daylight

Around 2.1 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 05:54 and sets about 18:17 local time in mid-May. Average cloud cover is 83%.

Is May a good time to visit Galle?

It is a reasonable choice: hot days but expect showers. The best months for Galle on our scoring are March, February, January; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Warm sea, hot days and little relief at night

The heat is consistent rather than extreme: days reaching 30°C are uncommon, but humidity of 86% can make outdoor time feel sticky. Plan a gentler pace around midday, choose loose, lightweight clothing and consider accommodation with air conditioning, especially if warm nights disturb your sleep. Evening plans will not call for much extra warmth, as average lows remain around 26°C. The sea averages 28.9°C, so water temperature is comfortably warm for swimming. That makes May more appealing if warm water matters more to you than clear skies, though sea temperature alone does not tell you whether conditions are safe for a swim.

Rain is the main reason to reconsider

With rain on about 30 days, you should build wet weather into the trip rather than treat it as an occasional interruption. That does not mean every day is a complete washout, but the sunshine average is only about 2.1 hours out of 12.3 hours of daylight. Keep outdoor plans flexible, carry rain protection and pack clothing that dries easily. May is a weaker fit if your holiday depends on long, sunny afternoons outside. Given the long-haul journey from London, that compromise deserves thought before booking. If your dates are flexible, March, February and January are better-rated months for Galle overall, rather than assuming May's warmth makes it the best choice.