Climate averages 1991–2020
Ambalantota weather
in September.
A hot, moderately wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Ambalantota: daytime highs average 30.9°C and nights cool to about 25.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 87 mm of rain on roughly 17 days, which makes September a moderately wet month (the 7th 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 (57 km away). In September its highs average 28.2°C, 2.7°C cooler than Ambalantota, with 196 mm of rain.
Among the 12 cities listed in Sri Lanka, Ambalantota ranks 4th of 12 for the warmest September highs and 6th of 12 for the driest September (rainfall, lowest first). The mean September high of those 12 cities is 29.9°C; Ambalantota is 1.1°C warmer than that mean.
From September to October, average highs fall by 0.6°C to 30.3°C, and monthly rainfall rises from 87 mm to 141 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
Ambalantota climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.2°C | 23.2°C | 56 | 8.6 | 11.812 h |
| February | 30.7°C23.6°C | 23.6°C | 42 | 7.9 | 11.912 h |
| March | 31.7°C24.4°C | 24.4°C | 58 | 11.2 | 12.112 h |
| April | 31.3°C25.2°C | 25.2°C | 110 | 18.7 | 12.312 h |
| May | 31.0°C25.9°C | 25.9°C | 101 | 18.7 | 12.412 h |
| June | 31.0°C25.8°C | 25.8°C | 60 | 14.9 | 12.512 h |
| July | 31.2°C25.6°C | 25.6°C | 45 | 13.2 | 12.412 h |
| August | 31.2°C25.3°C | 25.3°C | 52 | 13.0 | 12.312 h |
| September, selected | 30.9°C25.1°C | 25.1°C | 87 | 16.6 | 12.212 h |
| October | 30.3°C24.7°C | 24.7°C | 141 | 20.3 | 12.012 h |
| November | 29.2°C24.1°C | 24.1°C | 231 | 23.0 | 11.812 h |
| December | 28.9°C23.6°C | 23.6°C | 153 | 16.9 | 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 · 57 kmHigh 28.2°C · Low 24.6°C · 196 mm rain
- Galle in SeptemberSri Lanka · 90 kmHigh 27.7°C · Low 24.7°C · 240 mm rain
- Kandy in SeptemberSri Lanka · 137 kmHigh 27.1°C · Low 21.0°C · 121 mm rain
- Dehiwala-Mount Lavinia in SeptemberSri Lanka · 150 kmHigh 28.2°C · Low 24.5°C · 232 mm rain
- Colombo in SeptemberSri Lanka · 158 kmHigh 28.5°C · Low 24.5°C · 223 mm rain
- Kalmunai in SeptemberSri Lanka · 169 kmHigh 32.0°C · Low 25.9°C · 67 mm rain
- Negombo in SeptemberSri Lanka · 178 kmHigh 28.6°C · Low 24.9°C · 215 mm rain
- Batticaloa in SeptemberSri Lanka · 192 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 Ambalantota) is explained once on the Ambalantota year overview and on the Sources, method and limits page.