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Sri Lanka
Kalmunai weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Kalmunai?
For a warm holiday, the best week has been 7–13 February (Weather Index 94). Favourable start dates for a 7-day trip run from 2 February to 15 February. May, June and July are warmest (32°C), June is driest and February to August have the most sun.
- Warmest
- May, June and July 32°C
- Coolest
- January 27°C
- Driest
- June 22% rain-day chance
- Wettest
- November 82% 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 Kalmunai
Kalmunai 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 | 24.6 | 57.4 | 17.8 | 175.6 | 9.6 |
| February | 28.0 | 24.9 | 50.7 | 14.2 | 88.7 | 10.7 |
| March | 29.3 | 25.6 | 40.0 | 12.4 | 73.0 | 10.8 |
| April | 30.6 | 26.6 | 40.0 | 12.0 | 61.0 | 11.2 |
| May | 31.5 | 27.2 | 44.8 | 13.9 | 78.1 | 10.6 |
| June | 32.2 | 27.5 | 21.7 | 6.5 | 27.3 | 11.1 |
| July | 32.0 | 27.4 | 31.0 | 9.6 | 35.1 | 10.7 |
| August | 31.4 | 27.0 | 32.3 | 10.0 | 47.1 | 10.7 |
| September | 31.0 | 26.7 | 43.7 | 13.1 | 70.9 | 10.4 |
| October | 29.8 | 26.0 | 69.0 | 21.4 | 163.8 | 9.8 |
| November | 28.5 | 25.2 | 81.7 | 24.5 | 343.7 | 8.7 |
| December | 27.7 | 24.9 | 68.7 | 21.3 | 245.3 | 9.1 |
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.