Climate averages 1991–2020
Galle weather
in September.
A warm, very wet month: one of the coolest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Galle: daytime highs average 27.7°C and nights cool to about 24.7°C. By daytime temperature it is one of the coolest months of the year.
Expect about 240 mm of rain on roughly 27 days, which makes September a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 09 min on an average September day.
The nearest other city in this atlas is Matara (38 km away). In September its highs average 28.2°C, 0.5°C warmer than Galle, with 196 mm of rain.
Among the 12 cities listed in Sri Lanka, Galle ranks 11th of 12 for the warmest September highs and 12th of 12 for the driest September (rainfall, lowest first). The mean September high of those 12 cities is 29.9°C; Galle is 2.2°C cooler than that mean.
From September to October, average highs rise by 0.1°C to 27.8°C, and monthly rainfall rises from 240 mm to 263 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Galle climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.3°C23.6°C | 23.6°C | 64 | 12.2 | 11.812 h |
| February | 29.0°C24.0°C | 24.0°C | 51 | 10.3 | 11.912 h |
| March | 29.6°C24.7°C | 24.7°C | 65 | 13.9 | 12.112 h |
| April | 29.2°C25.4°C | 25.4°C | 147 | 22.6 | 12.312 h |
| May | 28.6°C25.5°C | 25.5°C | 279 | 28.6 | 12.412 h |
| June | 28.1°C25.2°C | 25.2°C | 244 | 27.6 | 12.512 h |
| July | 27.8°C24.9°C | 24.9°C | 214 | 27.5 | 12.412 h |
| August | 27.7°C24.8°C | 24.8°C | 207 | 27.3 | 12.312 h |
| September, selected | 27.7°C24.7°C | 24.7°C | 240 | 26.5 | 12.212 h |
| October | 27.8°C24.5°C | 24.5°C | 263 | 26.5 | 12.012 h |
| November | 28.0°C24.2°C | 24.2°C | 250 | 23.5 | 11.912 h |
| December | 28.0°C23.9°C | 23.9°C | 148 | 18.5 | 11.812 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Matara in SeptemberSri Lanka · 38 kmHigh 28.2°C · Low 24.6°C · 196 mm rain
- Ambalantota in SeptemberSri Lanka · 90 kmHigh 30.9°C · Low 25.1°C · 87 mm rain
- Dehiwala-Mount Lavinia in SeptemberSri Lanka · 96 kmHigh 28.2°C · Low 24.5°C · 232 mm rain
- Colombo in SeptemberSri Lanka · 107 kmHigh 28.5°C · Low 24.5°C · 223 mm rain
- Negombo in SeptemberSri Lanka · 136 kmHigh 28.6°C · Low 24.9°C · 215 mm rain
- Kandy in SeptemberSri Lanka · 146 kmHigh 27.1°C · Low 21.0°C · 121 mm rain
- Kalmunai in SeptemberSri Lanka · 235 kmHigh 32.0°C · Low 25.9°C · 67 mm rain
- Batticaloa in SeptemberSri Lanka · 247 kmHigh 33.2°C · Low 25.6°C · 48 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Galle) is explained once on the Galle year overview and on the Sources, method and limits page.