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Weather & Climate in Ko Samui, Thailand
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ko Samui has a warm climate with an average annual temperature of 81°F (27°C). Winters average 79°F in January while summers reach 82°F in July / relatively mild seasonal variation. The area gets 223 sunny days per year, above the national average. Annual precipitation totals 65.8 inches (wetter than the 38-inch national average). The city sits at an elevation of 26 feet.
Temperature
79°F Jan (26°C)
82°F Jul (28°C)
| Annual Average | 81.1°F |
| 50% above US avg | |
| January Average | 79°F (26°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 223 days/yr |
Geography
| Elevation | 26 ft (8 m) |
| Area | 88.3 sq mi (228.7 km²) |
| Population Density | 566/sq mi |
| Coordinates | 9.5357°N, 99.9357°W |
| Timezone | Asia/Bangkok |
Precipitation & Snow
Air Quality
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 1997 | Linda | Category 1 | 52 mph | 199 km |
| 1989 | Gay | Category 3 | 132 mph | 109 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 79°F (26°C) | 3.2 in | |
| February | 80°F (27°C) | 1.9 in | Driest |
| March | 82°F (28°C) | 2.7 in | |
| April | 83°F (29°C) | 3.0 in | |
| May | 84°F (29°C) | 5.1 in | Warmest |
| June | 83°F (28°C) | 3.4 in | |
| July | 82°F (28°C) | 3.5 in | |
| August | 82°F (28°C) | 4.0 in | |
| September | 81°F (27°C) | 5.0 in | |
| October | 80°F (27°C) | 10.4 in | |
| November | 79°F (26°C) | 16.3 in | Wettest |
| December | 78°F (26°C) | 7.5 in | Coldest |
Ko Samui has a seasonal temperature swing of 5°F / from 78°F in December to 84°F in May. Total annual precipitation is 65.8 inches, with November being the wettest month (16.3") and February the driest (1.9").