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Sri Lanka
Jaffna weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Jaffna?
For a warm holiday, the best week has been 5–11 February (Weather Index 97). Favourable start dates for a 7-day trip run from 29 January to 21 February. April is warmest (31°C), March is driest and March has the most sun.
- Warmest
- April 31°C
- Coolest
- January and December 27°C
- Driest
- March 14% rain-day chance
- Wettest
- November 78% rain-day chance
- Sunniest
- March 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Jaffna
Jaffna historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 26.9 | 25.2 | 25.5 | 7.9 | 78.6 | 10.4 |
| February | 27.7 | 25.5 | 15.4 | 4.3 | 36.3 | 11.3 |
| March | 29.3 | 26.7 | 13.9 | 4.3 | 17.1 | 11.5 |
| April | 30.6 | 28.1 | 22.7 | 6.8 | 42.0 | 11.5 |
| May | 30.5 | 28.5 | 34.5 | 10.7 | 95.9 | 10.7 |
| June | 29.9 | 28.4 | 29.0 | 8.7 | 37.0 | 11.1 |
| July | 29.7 | 28.0 | 39.4 | 12.2 | 53.4 | 10.3 |
| August | 29.4 | 27.6 | 41.0 | 12.7 | 63.9 | 10.4 |
| September | 29.2 | 27.4 | 45.3 | 13.6 | 70.4 | 10.3 |
| October | 28.8 | 26.7 | 66.8 | 20.7 | 213.1 | 9.3 |
| November | 27.8 | 26.0 | 78.3 | 23.5 | 404.9 | 8.1 |
| December | 27.1 | 25.5 | 56.5 | 17.5 | 202.9 | 9.6 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.