Sri Lanka weather by month
Sri Lanka is warmest in March (31°C average high) and coolest in August (28°C). Rain is part of every month in Sri Lanka (at least 17 rainy days a month by our count). The driest months are January to March. The sea is warm enough for easy swimming all year.
Warmest month
March
31°C
Coolest month
August
28°C
Wettest month
May
30 rainy days
Flight from London
11h
direct, estimated
Sri Lanka temperature by month
Tap a month for the detail and warmer alternatives.
When to go to Sri Lanka
What is the best month to visit Sri Lanka for sun?
Rain is part of every month in Sri Lanka (at least 17 rainy days a month by our count). The driest months are January to March.
What is the hottest month in Sri Lanka?
March averages 31°C. August is the coolest at 28°C.
When does it rain most in Sri Lanka?
May, with about 30 wet days.
When is the sea warm enough to swim in Sri Lanka?
all year, when the sea averages 21°C or more.
How we measured this
Daily averages from 2016 to 2025 for south coast, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis); sea temperatures are 2023 to 2025 averages from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain.
Going to Sri Lanka?
Save the places you find on TikTok and Instagram for Sri Lanka to one map, and Dream Trip will plan the days around them.
