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Trincomalee weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Trincomalee?
For a warm holiday, the best week has been 4–10 February (Weather Index 95). Favourable start dates for a 7-day trip run from 30 January to 16 February. June, July and August are warmest (33°C), June is driest and February to August have the most sun.
- Warmest
- June, July and August 33°C
- Coolest
- January 27°C
- Driest
- June 9% rain-day chance
- Wettest
- November 81% rain-day chance
- Sunniest
- February to August 11 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 Trincomalee
Trincomalee 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 | 27.4 | 24.8 | 47.7 | 14.8 | 148.1 | 10.1 |
| February | 28.0 | 25.1 | 36.4 | 10.2 | 68.5 | 11.1 |
| March | 29.5 | 25.7 | 30.3 | 9.4 | 43.4 | 11.2 |
| April | 31.4 | 26.7 | 33.3 | 10.0 | 49.3 | 11.4 |
| May | 32.5 | 27.2 | 34.2 | 10.6 | 85.5 | 10.7 |
| June | 33.2 | 27.3 | 9.3 | 2.8 | 15.1 | 11.2 |
| July | 32.9 | 27.1 | 22.6 | 7.0 | 35.8 | 10.7 |
| August | 32.6 | 26.7 | 27.4 | 8.5 | 47.8 | 10.7 |
| September | 32.4 | 26.5 | 30.7 | 9.2 | 47.3 | 10.4 |
| October | 30.7 | 25.9 | 63.5 | 19.7 | 206.5 | 9.8 |
| November | 28.6 | 25.2 | 81.0 | 24.3 | 404.3 | 8.6 |
| December | 27.8 | 25.0 | 68.1 | 21.1 | 243.3 | 9.3 |
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.