10-day forecast — Koh Samui
Refreshed hourly
Fri · Today · 13 Nov
Showers
81°
77°
1.30 in
Wind10 mph E
Gusts19 mph
UV index8 – Very high
Precip chance92%
Sunrise6:13 AM
Sunset5:55 PM
Sat · Tomorrow · 14 Nov
Showers
82°
78°
0.74 in
Wind8 mph SE
Gusts15 mph
UV index8 – High
Precip chance87%
Sunrise6:13 AM
Sunset5:55 PM
Sunday · 15 Nov
Showers
83°
80°
0.20 in
Wind4 mph SE
Gusts9 mph
UV index10 – Very high
Precip chance78%
Sunrise6:13 AM
Sunset5:55 PM
Monday · 16 Nov
Showers
83°
79°
0.16 in
Wind5 mph S
Gusts13 mph
UV index6 – High
Precip chance76%
Sunrise6:14 AM
Sunset5:55 PM
Tuesday · 17 Nov
Showers
84°
80°
0.07 in
Wind7 mph SE
Gusts13 mph
UV index7 – High
Precip chance63%
Sunrise6:14 AM
Sunset5:55 PM
Wednesday · 18 Nov
Showers
83°
79°
0.62 in
Wind9 mph E
Gusts20 mph
UV index7 – High
Precip chance84%
Sunrise6:14 AM
Sunset5:55 PM
Thursday · 19 Nov
Showers
83°
78°
0.91 in
Wind11 mph E
Gusts23 mph
UV index6 – High
Precip chance84%
Sunrise6:15 AM
Sunset5:55 PM
Friday · 20 Nov
Showers
83°
79°
0.21 in
Wind9 mph E
Gusts21 mph
UV index6 – High
Precip chance80%
Sunrise6:15 AM
Sunset5:55 PM
Saturday · 21 Nov
Showers
81°
79°
0.44 in
Wind10 mph E
Gusts20 mph
UV index6 – High
Precip chance90%
Sunrise6:16 AM
Sunset5:55 PM
Sunday · 22 Nov
Showers
79°
78°
1.27 in
Wind12 mph E
Gusts22 mph
UV index6 – High
Precip chance92%
Sunrise6:16 AM
Sunset5:55 PM
Monday · 23 Nov
Showers
82°
78°
0.99 in
Wind11 mph E
Gusts22 mph
UV index6 – High
Precip chance88%
Sunrise6:17 AM
Sunset5:55 PM
Tuesday · 24 Nov
Showers
83°
78°
0.17 in
Wind10 mph NE
Gusts19 mph
UV index6 – High
Precip chance82%
Sunrise6:17 AM
Sunset5:55 PM
Wednesday · 25 Nov
Showers
83°
80°
0.61 in
Wind8 mph NE
Gusts18 mph
UV index6 – High
Precip chance84%
Sunrise6:17 AM
Sunset5:55 PM
Thursday · 26 Nov
Showers
82°
79°
0.53 in
Wind17 mph NE
Gusts20 mph
UV index6 – High
Precip chance86%
Sunrise6:18 AM
Sunset5:56 PM
About Koh Samui
CountryThailand
RegionGulf Islands
ContinentAsia
Time zoneAsia/Bangkok (+07:00)
Latitude9.5120°
Longitude100.0140°
Air QualityGood (AQI 36)
Details & indices
Wind
9 mph E
Gusts 19 mph
Humidity
93%
Dew point 75°
Pressure
29.85 inHg
Falling
UV index
8 — Very high
High today
Air Quality
Good
AQI 36 · US EPA
Visibility
6 mi
Reduced
Sun & moon
Sunrise6:13 AM
Sunset5:55 PM
Length of day11h 42m
Moonrise9:43 AM
Moonset9:28 PM
Moon phase🌔 Waxing Crescent
Local time4:03 AM (+07:00)
Koh Samui climate in May
8-year averages · when to visitBest months: January–December · May: Good
| April | May | June | |
|---|---|---|---|
| Average temperature | → 79°F | 79°F | → 79°F |
| Typical high | → 84°F | 84°F | → 84°F |
| Typical low | → 75°F | 75°F | → 75°F |
| Water temperature | ▲ 89°F | 90°F | ▼ 88°F |
| Precipitation | ▲ 3.8 in | 4.8 in | ▼ 3.0 in |
| Wet days | ▲ 16 d | 20 d | ▼ 17 d |
| Humidity | ▲ 74% | 80% | ▼ 75% |
| Sunshine per day | ▼ 10.9 h | 10.4 h | ▼ 9.9 h |
| Cloud cover | ▲ 12% | 17% | ▲ 22% |
| Midday UV | → 12 | 12 | ▼ 11 |
| Daylight | 12:20 | 12:34 | 12:40 |
| Our take | Good | Good | Good |
May temperatures day by day daily mean + smoothed trend · °F
May precipitation day by day in
May 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: 4:03 AM
Koh Samui, Thailand · 9.51°N, 100.01°E · Asia/Bangkok · Forecast computed for these exact coordinates