Weather radar Koh Samui
Real-time precipitation radar · Surat Thani · Thailand
Koh Samui climate table – average temperature, precipitation & sunshine hours
The climate table for Koh Samui shows long-term monthly averages (2000–2023): average high and average low temperature in °C, monthly precipitation (mm), rainy days and sunshine hours per month. Data source: ERA5 reanalysis (ECMWF) via the WDTEC Climate Archive.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27.5° | 28.2° | 29.2° | 30.1° | 30.2° | 30.2° | 29.9° | 29.9° | 29.2° | 28.3° | 27.9° | 27.6° |
| Avg low (°C) | 25.2° | 25.6° | 26.3° | 27.1° | 27.1° | 27° | 26.7° | 26.6° | 26.2° | 25.6° | 25.5° | 25.4° |
| Precipitation (mm) | 91 | 38 | 98 | 107 | 117 | 83 | 82 | 80 | 134 | 257 | 299 | 155 |
| Rainy days | 12 | 8 | 10 | 14 | 21 | 17 | 18 | 17 | 21 | 26 | 22 | 15 |
| Sunshine hours | 319 | 304 | 329 | 320 | 316 | 291 | 288 | 292 | 267 | 265 | 255 | 295 |
| Humidity | – | – | – | – | – | – | – | – | – | – | – | – |
Best time to visit Koh Samui
The best time to visit Koh Samui is typically February. In this month the average high is 28.2°C, precipitation is 38 mm and sunshine duration is 304 hours. The annual average high is 29°C, total annual precipitation is 1541 mm (201 rainy days/year) and annual sunshine is 3541 hours.
Frequently asked questions about the weather in Koh Samui
How up to date is the weather radar for Koh Samui?
The weather radar for Koh Samui is updated every 5 minutes with new radar data from the OPERA composite radar. A 2-hour forecast animation is also available. Rainfall probability, wind gusts and UV index are available up to 14 days in advance.
What weather data is available for Koh Samui?
Besides the rain radar, RadarWeather provides for Koh Samui: rainfall probability, thunderstorm warning (CAPE index), wind gusts, UV index, air pressure, humidity, dew point, sunshine hours, snow line and a 14-day forecast based on ICON-D2, ECMWF IFS and GFS.
When are thunderstorms expected in Koh Samui?
The thunderstorm potential for Koh Samui is calculated from the CAPE index and lightning potential. Active storm cells and severe weather warnings are visible on the radar map in real time. Thunderstorm warnings are issued automatically as soon as storm cells are detected near Koh Samui.
What is the climate like in Koh Samui?
Koh Samui has an annual average high of 29°C. The warmest month is May (avg high 30.2°C), the coldest January (avg low 25.2°C). The wettest month is November with 299 mm, the driest February with 38 mm. Total annual precipitation is 1541 mm (201 rainy days). Annual sunshine is 3541 hours.
Weather radar near Koh Samui
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