Best Time to Visit
🇹🇭 Koh Samui, Thailand · Asia
Based on 30-year climate data (1991-2020) from Open-Meteo
Jan
25°
23°
Great
Feb
25°
23°
Great
Mar
26°
24°
Great
Apr
27°
24°
Great
May
27°
24°
Good
Jun
27°
24°
Good
Jul
27°
24°
Good
Aug
27°
24°
Good
Sep
26°
23°
Good
Oct
25°
23°
Good
Nov
25°
23°
Good
Dec
25°
23°
Good
| Month | High | Low | Rain Days | Sunshine | Humidity | UV | Rating | Details |
|---|---|---|---|---|---|---|---|---|
| JanuaryRecommended | 25°C | 23°C | 11 | 11h | 82% | 3 | Great | View |
| FebruaryRecommended | 25°C | 23°C | 6 | 11h | 82% | 3 | Great | View |
| MarchRecommended | 26°C | 24°C | 10 | 11h | 82% | 6 | Great | View |
| AprilRecommended | 27°C | 24°C | 12 | 11h | 82% | 6 | Great | View |
| May | 27°C | 24°C | 22 | 11h | 82% | 8 | Good | View |
| June | 27°C | 24°C | 19 | 10h | 82% | 8 | Good | View |
| July | 27°C | 24°C | 18 | 10h | 82% | 8 | Good | View |
| August | 27°C | 24°C | 18 | 10h | 82% | 8 | Good | View |
| September | 26°C | 23°C | 22 | 9h | 82% | 6 | Good | View |
| October | 25°C | 23°C | 26 | 9h | 82% | 6 | Good | View |
| November | 25°C | 23°C | 22 | 9h | 82% | 3 | Good | View |
| December | 25°C | 23°C | 14 | 10h | 82% | 3 | Good | View |
Data source: Open-Meteo ERA5 reanalysis archive, 30-year historical normals (1991-2020). Temperatures in Celsius. Sunshine hours are daily averages.
Avg: 27°C high, 24°C low
Comfortable warmth at 27°C (81°F), ideal for outdoor activities. Rain is frequent, waterproof gear recommended. Nights cool to 24°C (75°F).
Avg: 27°C high, 24°C low
Comfortable warmth at 27°C (81°F), ideal for outdoor activities. Rain is frequent, waterproof gear recommended. Nights cool to 24°C (75°F).
Avg: 25°C high, 23°C low
Comfortable warmth at 25°C (77°F), ideal for outdoor activities. Rain is frequent, waterproof gear recommended. Nights cool to 23°C (73°F).
Avg: 25°C high, 23°C low
Comfortable warmth at 25°C (77°F), ideal for outdoor activities. Occasional showers possible. Nights cool to 23°C (73°F).
The least favorable time to visit Koh Samui is May and June. During this period, you can expect heavy rainfall, high humidity.
May
Challenges: heavy rainfall, high humidity
June
Challenges: heavy rainfall, high humidity
July
Challenges: heavy rainfall, high humidity
Note: visiting during off-peak months often means lower prices, fewer crowds, and a more authentic experience.
Packing recommendations for visiting Koh Samui during the best travel months (February, January, March), when temperatures range from 23°C to 25°C:
Koh Samui has a tropical climate (Koppen classification: Am). The warmest month is August with highs of 27°C, while the coldest month is December at just 25°C. Annual rainfall averages 1530mm across approximately 200 rain days.
| Metric | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 25 | 25 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 25 | 25 | 25 |
| Low °C | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 |
| Rain Days | 11 | 6 | 10 | 12 | 22 | 19 | 18 | 18 | 22 | 26 | 22 | 14 |
| Rain mm | 81 | 36 | 89 | 96 | 115 | 87 | 82 | 91 | 140 | 282 | 284 | 147 |
| Sun h/day | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 10 |
| Humidity % | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 82 |
| UV Index | 3 | 3 | 6 | 6 | 8 | 8 | 8 | 8 | 6 | 6 | 3 | 3 |
Considering alternatives to Koh Samui? Compare the best travel months for nearby cities:
For a complete day-by-day weather breakdown including packing lists, activities, and local events, explore each month individually:
January
February
March
April
May
June
July
August
September
October
November
December
Explore weather guides for other popular destinations: