14-day forecast — Koh Samui
Updated every hour
Fri · Today · 11 Sep
Showers
+29°
+28°
18,0 mm
Sat · Tomorrow · 12 Sep
Showers
+28°
+26°
9,8 mm
Sunday · 13 Sep
Showers
+27°
+25°
40,5 mm
Monday · 14 Sep
Showers
+27°
+25°
33,4 mm
Tuesday · 15 Sep
Showers
+29°
+26°
14,6 mm
Wednesday · 16 Sep
Cloudy
+29°
+27°
15,4 mm
Thursday · 17 Sep
Showers
+29°
+27°
5,7 mm
Friday · 18 Sep
Showers
+28°
+27°
15,9 mm
Saturday · 19 Sep
Showers
+29°
+27°
6,2 mm
Sunday · 20 Sep
Showers
+29°
+27°
13,6 mm
Monday · 21 Sep
Showers
+29°
+27°
1,3 mm
Tuesday · 22 Sep
Cloudy
+29°
+28°
3,7 mm
Wednesday · 23 Sep
Cloudy
+29°
+28°
2,1 mm
Thursday · 24 Sep
Showers
+29°
+28°
3,1 mm
About Koh Samui
Île tropicale du golfe de Thaïlande, plages et chaleur moite.
CountryThailand
RegionGolfe de Thaïlande
ContinentAsia
Time zoneAsia/Bangkok (+07:00)
Latitude9.5120°
Longitude100.0136°
Air qualityFair (EAQI 23)
Climate in Koh Samui in September
Normals 8 years · best time to visit · Open-MeteoBest time to visit Koh Samui: January–December. With good weather, September is a recommended month to visit.
| August | September | October | |
|---|---|---|---|
| Average temperature | ▼ 26°C | 25°C | ▼ 24°C |
| Highest temperature | ▼ 29°C | 27°C | ▼ 26°C |
| Lowest temperature | → 23°C | 23°C | ▼ 22°C |
| Sea temperature | ▼ 30,9°C | 30,1°C | ▲ 30,3°C |
| Precipitation | ▲ 92 mm | 131 mm | ▲ 226 mm |
| Days with precipitation | ▲ 19 d | 21 d | ▲ 28 d |
| Humidity | ▼ 79% | 78% | ▲ 83% |
| Sunshine hours per day | ▼ 9,4 h | 8,9 h | ▼ 8,8 h |
| Cloud cover | ▲ 24% | 27% | ▼ 26% |
| UV index (midday) | → 12 | 12 | ▼ 11 |
| Day length | 12:26 | 12:11 | 11:55 |
| Our rating | Good | Good | Good |
Temperature day by day in September mean + moving average
Precipitation day by day in September mm
UV index day by day in September midday value, clear-sky
Climate normals calculated from Open-Meteo (ERA5 archive 8 years, sea temperature Marine API). UV estimated from solar elevation.
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Data source
Global weather models — international forecasts
Météo de Koh Samui (Thailand) : conditions actuelles et prévisions à 24 h et 14 jours pour préparer votre voyage. Sur place actuellement, il fait +28°, showers, vent 25 km/h. Sur les 7 prochains jours, les températures varient de 25 à 29 °C et 137 mm de pluie. Heure locale (fuseau Asia/Bangkok). Données Open-Meteo et WeatherAPI.