Sri Lanka weather by month
Sri Lanka is warmest in March (31°C average high) and coolest in August (28°C). For warm, mostly dry weather, go February 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
414 mm
Flight from London
11h
direct, estimated
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Sri Lanka temperature by month
Tap a month for the detail and warmer alternatives.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 29°C | 23°C | 28°C | 150 mm |
| February | 30°C | 23°C | 29°C | 108 mm |
| March | 31°C | 24°C | 30°C | 119 mm |
| April | 30°C | 25°C | 30°C | 176 mm |
| May | 29°C | 26°C | 30°C | 414 mm |
| June | 29°C | 25°C | 29°C | 277 mm |
| July | 29°C | 25°C | 28°C | 254 mm |
| August | 28°C | 25°C | 28°C | 271 mm |
| September | 28°C | 25°C | 29°C | 310 mm |
| October | 28°C | 24°C | 29°C | 309 mm |
| November | 29°C | 24°C | 29°C | 396 mm |
| December | 29°C | 23°C | 29°C | 189 mm |
When to go to Sri Lanka
What is the best month to visit Sri Lanka for sun?
For warm, mostly dry days, go February to March, going by our 10-year averages.
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 414 mm of rain.
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. Rain is the average monthly total.
Going to Sri Lanka?
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