Climate averages 1991–2020
Jaffna weather
in September.
A hot, moderately wet month: the 7th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Jaffna: daytime highs average 30.1°C and nights cool to about 26.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 67 mm of rain on roughly 12 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average September day.
The nearest other city in this atlas is Point Pedro (30 km away). In September its highs average 30.8°C, 0.7°C warmer than Jaffna, with 42 mm of rain.
Among the 12 cities listed in Sri Lanka, Jaffna ranks 6th 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; Jaffna is 0.3°C warmer than that mean.
From September to October, average highs fall by 1.1°C to 29.0°C, and monthly rainfall rises from 67 mm to 208 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
Jaffna climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.8°C24.4°C | 24.4°C | 62 | 6.7 | 11.612 h |
| February | 28.1°C24.8°C | 24.8°C | 26 | 4.3 | 11.812 h |
| March | 30.2°C25.9°C | 25.9°C | 22 | 3.3 | 12.112 h |
| April | 31.4°C27.3°C | 27.3°C | 45 | 7.5 | 12.312 h |
| May | 31.2°C28.1°C | 28.1°C | 58 | 7.6 | 12.613 h |
| June | 30.7°C27.9°C | 27.9°C | 27 | 5.6 | 12.713 h |
| July | 30.5°C27.5°C | 27.5°C | 33 | 9.0 | 12.613 h |
| August | 30.3°C27.1°C | 27.1°C | 48 | 10.4 | 12.412 h |
| September, selected | 30.1°C26.9°C | 26.9°C | 67 | 12.1 | 12.212 h |
| October | 29.0°C26.0°C | 26.0°C | 208 | 20.9 | 11.912 h |
| November | 27.6°C25.1°C | 25.1°C | 313 | 22.1 | 11.712 h |
| December | 26.8°C24.7°C | 24.7°C | 199 | 16.3 | 11.612 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
- Point Pedro in SeptemberSri Lanka · 30 kmHigh 30.8°C · Low 26.7°C · 42 mm rain
- Pattukkottai in SeptemberIndia · 113 kmHigh 33.9°C · Low 25.6°C · 116 mm rain
- Nagapattinam in SeptemberIndia · 123 kmHigh 31.7°C · Low 26.8°C · 80 mm rain
- Kāraikāl in SeptemberIndia · 140 kmHigh 31.8°C · Low 26.8°C · 72 mm rain
- Kāraikkudi in SeptemberIndia · 143 kmHigh 34.2°C · Low 25.1°C · 98 mm rain
- Pudukkottai in SeptemberIndia · 152 kmHigh 34.3°C · Low 25.2°C · 101 mm rain
- Paramagudi in SeptemberIndia · 156 kmHigh 34.8°C · Low 25.5°C · 99 mm rain
- Thanjavur in SeptemberIndia · 156 kmHigh 34.8°C · Low 25.7°C · 108 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 Jaffna) is explained once on the Jaffna year overview and on the Sources, method and limits page.