Jaffna weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: January – March
What is the weather like in Jaffna in September?
In September, Jaffna is hot: daytime highs average 30 °C, and even at night it stays warm at around 27 °C. The sea averages 28.7 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 72 mm in total. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. It is often windy, with gusts of around 31 km/h. All in all, September is a so-so month for a holiday in Jaffna.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 56 | 53 | 46 |
| Day | 30° | 30° | 29° |
| Night | 27° | 27° | 26° |
| Sea | 29° | 29° | 29° |
| Sun | 7 h | 7 h | 6 h |
| Rain days | 11 | 13 | 21 |
More details for September
- Daylight
- 12 h 11 min06:00 – 18:11
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 31 km/haverage daily peakAll months
- Cloud cover
- 75 %on averageAll months
- Hot days
- 16 days30 °C or moreAll months
- Time zone
- UTC+5:30Asia/Colombo
How the score comes together
- Temperatureweight 50 %61 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 30 %34 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
- Windproof jacket
Jaffna in September: quick answers
Is Jaffna hot in September?
Yes. In September, Jaffna is hot: daytime highs average 30 °C and nights stay around 27 °C. On about 16 days the thermometer climbs to 30 °C or more.
Can you swim in Jaffna in September?
Yes. In September the sea averages 28.7 °C – lovely and warm for swimming.
Does it rain much in Jaffna in September?
Rain is frequent, with about 13 rainy days and 72 mm in total.
Jaffna month by month
The whole year in JaffnaAll destinations: Sri LankaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences