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Koh Tao weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Koh Tao?
For a warm holiday, the best week has been 4–10 February (Weather Index 96). Favourable start dates for a 7-day trip run from 9 January to 17 February. April, May and June are warmest (29°C), March is driest and February, March and April have the most sun.
- Warmest
- April, May and June 29°C
- Coolest
- October to February 27°C
- Driest
- March 20% rain-day chance
- Wettest
- October 85% 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 Koh Tao
Koh Tao 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 | 26.6 | 25.5 | 26.8 | 8.3 | 101.4 | 10.4 |
| February | 26.9 | 25.7 | 27.1 | 7.6 | 49.5 | 10.8 |
| March | 27.6 | 26.5 | 20.3 | 6.3 | 34.2 | 11.1 |
| April | 28.6 | 27.0 | 39.0 | 11.7 | 104.7 | 11.1 |
| May | 28.8 | 27.0 | 67.1 | 20.8 | 168.1 | 10.3 |
| June | 28.6 | 26.7 | 62.3 | 18.7 | 111.7 | 9.7 |
| July | 28.2 | 26.4 | 66.1 | 20.5 | 135.4 | 8.8 |
| August | 28.1 | 26.3 | 62.3 | 19.3 | 121.1 | 9.6 |
| September | 27.6 | 26.0 | 73.3 | 22.0 | 181.3 | 8.5 |
| October | 27.3 | 25.6 | 84.8 | 26.3 | 264.0 | 8.5 |
| November | 27.3 | 25.6 | 73.0 | 21.9 | 272.0 | 8.8 |
| December | 26.7 | 25.5 | 42.9 | 13.3 | 192.1 | 9.7 |
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.