10-day forecast — Koh Samui
Refreshed hourly
Thu · Today · 12 Nov
Showers
27°
25°
1.50 in
Wind13 mph E
Gusts22 mph
UV index10 – Very high
Precip chance91%
Sunrise6:12 AM
Sunset5:55 PM
Fri · Tomorrow · 13 Nov
Showers
27°
25°
2.47 in
Wind10 mph SE
Gusts16 mph
UV index8 – Very high
Precip chance92%
Sunrise6:13 AM
Sunset5:55 PM
Saturday · 14 Nov
Showers
28°
26°
0.28 in
Wind8 mph SE
Gusts16 mph
UV index8 – High
Precip chance85%
Sunrise6:13 AM
Sunset5:55 PM
Sunday · 15 Nov
Showers
29°
26°
0.17 in
Wind6 mph SE
Gusts11 mph
UV index10 – Very high
Precip chance80%
Sunrise6:13 AM
Sunset5:55 PM
Monday · 16 Nov
Showers
29°
26°
0.11 in
Wind5 mph S
Gusts15 mph
UV index6 – High
Precip chance73%
Sunrise6:14 AM
Sunset5:55 PM
Tuesday · 17 Nov
Showers
29°
26°
0.03 in
Wind9 mph SE
Gusts15 mph
UV index7 – High
Precip chance55%
Sunrise6:14 AM
Sunset5:55 PM
Wednesday · 18 Nov
Showers
28°
27°
0.16 in
Wind9 mph E
Gusts21 mph
UV index6 – High
Precip chance75%
Sunrise6:14 AM
Sunset5:55 PM
Thursday · 19 Nov
Showers
28°
26°
0.48 in
Wind13 mph E
Gusts25 mph
UV index6 – High
Precip chance87%
Sunrise6:15 AM
Sunset5:55 PM
Friday · 20 Nov
Showers
28°
26°
0.63 in
Wind9 mph E
Gusts20 mph
UV index6 – High
Precip chance87%
Sunrise6:15 AM
Sunset5:55 PM
Saturday · 21 Nov
Showers
28°
26°
0.31 in
Wind10 mph SE
Gusts21 mph
UV index6 – High
Precip chance84%
Sunrise6:16 AM
Sunset5:55 PM
Sunday · 22 Nov
Showers
26°
25°
0.92 in
Wind10 mph E
Gusts20 mph
UV index6 – High
Precip chance91%
Sunrise6:16 AM
Sunset5:55 PM
Monday · 23 Nov
Showers
27°
25°
0.48 in
Wind7 mph E
Gusts17 mph
UV index6 – High
Precip chance89%
Sunrise6:17 AM
Sunset5:55 PM
Tuesday · 24 Nov
Showers
28°
26°
0.13 in
Wind5 mph SE
Gusts15 mph
UV index6 – High
Precip chance74%
Sunrise6:17 AM
Sunset5:55 PM
Wednesday · 25 Nov
Showers
28°
26°
0.09 in
Wind3 mph SE
Gusts12 mph
UV index6 – High
Precip chance75%
Sunrise6:17 AM
Sunset5:55 PM
About Koh Samui
CountryThailand
RegionGulf Islands
ContinentAsia
Time zoneAsia/Bangkok (+07:00)
Latitude9.5120°
Longitude100.0140°
Air QualityGood (AQI 38)
Details & indices
Wind
9 mph E
Gusts 17 mph
Humidity
91%
Dew point 24°
Pressure
29.88 inHg
Falling
UV index
10 — Very high
High today
Air Quality
Good
AQI 38 · US EPA
Visibility
6 mi
Clear view
Sun & moon
Sunrise6:12 AM
Sunset5:55 PM
Length of day11h 43m
Moonrise8:50 AM
Moonset8:34 PM
Moon phase🌔 Waxing Crescent
Local time8:46 PM (+07:00)
Koh Samui climate in December
8-year averages · when to visitBest months: January–December · December: Good
| November | December | January | |
|---|---|---|---|
| Average temperature | → 24°C | 24°C | → 24°C |
| Typical high | ▼ 26°C | 25°C | ▲ 26°C |
| Typical low | → 22°C | 22°C | → 22°C |
| Water temperature | ▼ 29.4°C | 28.5°C | ▲ 28.7°C |
| Precipitation | ▼ 283 mm | 194 mm | ▼ 87 mm |
| Wet days | ▼ 25 d | 19 d | ▼ 18 d |
| Humidity | ▼ 83% | 81% | ▼ 77% |
| Sunshine per day | ▲ 8.6 h | 9.7 h | ▲ 10.4 h |
| Cloud cover | ▼ 26% | 17% | ▼ 10% |
| Midday UV | → 9 | 9 | → 9 |
| Daylight | 11:41 | 11:35 | 11:38 |
| Our take | Good | Good | Good |
December temperatures day by day daily mean + smoothed trend · °C
December precipitation day by day mm
December UV day by day clear-sky midday value
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
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NBM + global weather models
Updated: 8:46 PM
Koh Samui, Thailand · 9.51°N, 100.01°E · Asia/Bangkok · Forecast computed for these exact coordinates