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Sri Lanka
Negombo weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Negombo?
For a warm holiday, the best week has been 29 December – 4 January (Weather Index 84). Favourable start dates for a 7-day trip run from 23 December to 6 January. February and March are warmest (34°C), February is driest and February, March and April have the most sun.
- Warmest
- February and March 34°C
- Coolest
- June to November 30°C
- Driest
- February 19% rain-day chance
- Wettest
- June 97% rain-day chance
- Sunniest
- February, March and April 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 Negombo
Negombo 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 | 31.7 | 23.6 | 26.8 | 8.3 | 67.4 | 10.3 |
| February | 33.6 | 24.3 | 18.6 | 5.2 | 28.9 | 11.2 |
| March | 33.9 | 25.5 | 49.7 | 15.4 | 71.5 | 10.9 |
| April | 32.9 | 25.9 | 83.7 | 25.1 | 164.9 | 10.6 |
| May | 31.1 | 26.2 | 96.1 | 29.8 | 335.1 | 8.9 |
| June | 30.3 | 26.2 | 96.7 | 29.0 | 229.4 | 9.8 |
| July | 30.1 | 26.0 | 86.8 | 26.9 | 183.4 | 10.0 |
| August | 29.9 | 25.8 | 86.8 | 26.9 | 215.9 | 9.9 |
| September | 29.9 | 25.5 | 91.7 | 27.5 | 224.4 | 9.3 |
| October | 30.0 | 25.0 | 91.6 | 28.4 | 367.4 | 8.5 |
| November | 30.4 | 24.5 | 78.3 | 23.5 | 397.3 | 8.1 |
| December | 30.9 | 24.0 | 43.5 | 13.5 | 113.7 | 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.