Climate averages 1991–2020
Kalmunai weather
in September.
A hot, moderately wet month: the 5th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Kalmunai: daytime highs average 32.0°C and nights cool to about 25.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 67 mm of rain on roughly 14 days, which makes September a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 10 min on an average September day.
The nearest other city in this atlas is Batticaloa (37 km away). In September its highs average 33.2°C, 1.1°C warmer than Kalmunai, with 48 mm of rain.
Among the 12 cities listed in Sri Lanka, Kalmunai ranks 3rd of 12 for the warmest September highs and joint 4th of 12 for the driest September (rainfall, lowest first). The mean September high of those 12 cities is 29.9°C; Kalmunai is 2.2°C warmer than that mean.
From September to October, average highs fall by 1.8°C to 30.2°C, and monthly rainfall rises from 67 mm to 164 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
Kalmunai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.0°C24.0°C | 24.0°C | 186 | 17.8 | 11.712 h |
| February | 27.8°C24.1°C | 24.1°C | 96 | 13.2 | 11.912 h |
| March | 29.5°C24.7°C | 24.7°C | 60 | 10.0 | 12.112 h |
| April | 30.8°C25.8°C | 25.8°C | 70 | 13.3 | 12.312 h |
| May | 32.3°C26.6°C | 26.6°C | 59 | 11.6 | 12.512 h |
| June | 33.2°C26.6°C | 26.6°C | 31 | 6.7 | 12.513 h |
| July | 33.2°C26.4°C | 26.4°C | 31 | 7.5 | 12.513 h |
| August | 32.8°C26.1°C | 26.1°C | 42 | 9.3 | 12.412 h |
| September, selected | 32.0°C25.9°C | 25.9°C | 67 | 13.6 | 12.212 h |
| October | 30.2°C25.2°C | 25.2°C | 164 | 20.8 | 12.012 h |
| November | 28.2°C24.5°C | 24.5°C | 280 | 24.8 | 11.812 h |
| December | 27.2°C24.2°C | 24.2°C | 310 | 22.6 | 11.712 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
- Batticaloa in SeptemberSri Lanka · 37 kmHigh 33.2°C · Low 25.6°C · 48 mm rain
- Kandy in SeptemberSri Lanka · 133 kmHigh 27.1°C · Low 21.0°C · 121 mm rain
- Trincomalee in SeptemberSri Lanka · 146 kmHigh 33.0°C · Low 25.8°C · 65 mm rain
- Ambalantota in SeptemberSri Lanka · 169 kmHigh 30.9°C · Low 25.1°C · 87 mm rain
- Matara in SeptemberSri Lanka · 217 kmHigh 28.2°C · Low 24.6°C · 196 mm rain
- Negombo in SeptemberSri Lanka · 222 kmHigh 28.6°C · Low 24.9°C · 215 mm rain
- Colombo in SeptemberSri Lanka · 225 kmHigh 28.5°C · Low 24.5°C · 223 mm rain
- Dehiwala-Mount Lavinia in SeptemberSri Lanka · 226 kmHigh 28.2°C · Low 24.5°C · 232 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 Kalmunai) is explained once on the Kalmunai year overview and on the Sources, method and limits page.