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Gampaha Weather by Month
Average temperatures, rainfall and humidity for Gampaha, Sri Lanka, month by month, built from OpenWeather’s historical records. Use it to see what a typical Gampaha month looks like before you travel — then check the live Gampaha forecast for the days ahead.
Warmest month
February
32°C average high
Coolest month
January
23°C average low
Wettest month
November
107 mm of rain
Driest month
February
21 mm of rain
Average temperature and rainfall in Gampaha by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 31°C | 23°C | 18°C / 36°C | 23 mm | 78% | 14 km/h |
| February | 32°C | 23°C | 19°C / 37°C | 21 mm | 75% | 13 km/h |
| March | 32°C | 24°C | 19°C / 36°C | 43 mm | 78% | 9 km/h |
| April | 32°C | 25°C | 22°C / 35°C | 65 mm | 80% | 9 km/h |
| May | 31°C | 26°C | 22°C / 36°C | 88 mm | 85% | 14 km/h |
| June | 30°C | 26°C | 23°C / 34°C | 56 mm | 83% | 16 km/h |
| July | 30°C | 26°C | 22°C / 32°C | 37 mm | 81% | 15 km/h |
| August | 30°C | 26°C | 22°C / 39°C | 54 mm | 82% | 16 km/h |
| September | 30°C | 25°C | 23°C / 33°C | 57 mm | 83% | 15 km/h |
| October | 30°C | 25°C | 22°C / 34°C | 74 mm | 85% | 11 km/h |
| November | 30°C | 24°C | 21°C / 34°C | 107 mm | 84% | 9 km/h |
| December | 31°C | 23°C | 19°C / 39°C | 60 mm | 81% | 11 km/h |
Best time to visit Gampaha
The most comfortable time to visit Gampaha is generally January and July to August, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around November, totalling about 684 mm a year.
Travellers who prefer heat should aim for February, when highs average 32°C. November is the month to avoid if rain would spoil your plans — it averages 107 mm, roughly 5× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Gampaha forecast for what is happening now.