Thailand
Best Time to Visit
Koh Samui
Visit in March — score 73/100 · avg high 82°F · 13 rainy days
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Monthly Travel Scores
How we scoreScores reflect weather comfort (35%), dry days (35%), daylight hours (15%), crowd levels (10%), and cost (5%) — weighted for typical travelers preferring warm, dry conditions. Customize weights in the interactive tool.January
February
#2March
#1April
#3May
June
July
August
September
October
November
December
Monthly Weather Data
| Month | Score | Avg °F | High °F | Low °F | Rain Days | Precip (mm) | Daylight | Crowds | Cost |
|---|---|---|---|---|---|---|---|---|---|
| January | 50 | 75° | 78° | 72° | 20 | 130 | 11.5h | High | Average |
| February | 62 | 75° | 79° | 72° | 16 | 63 | 11.7h | High | Average |
| March | 73 | 77° | 82° | 74° | 13 | 41 | 11.9h | Moderate | Average |
| April | 61 | 79° | 83° | 75° | 18 | 107 | 12.2h | Moderate | Average |
| May | 52 | 79° | 83° | 76° | 24 | 114 | 12.4h | Moderate | Below avg |
| June | 60 | 79° | 83° | 75° | 20 | 74 | 12.6h | Moderate | Below avg |
| July | 55 | 78° | 83° | 75° | 21 | 95 | 12.5h | Moderate | Average |
| August | 55 | 78° | 83° | 74° | 21 | 81 | 12.3h | Moderate | Average |
| September | 52 | 77° | 81° | 74° | 24 | 131 | 12.0h | Moderate | Below avg |
| October | 49 | 76° | 79° | 73° | 28 | 220 | 11.8h | Moderate | Average |
| November | 49 | 75° | 78° | 72° | 26 | 286 | 11.6h | Moderate | Average |
| December | 43 | 74° | 78° | 72° | 22 | 216 | 11.4h | High | Above avg |
Seasonal Breakdown
Spring
- Score
- 62/100
- High
- 83°F
- Low
- 75°F
- Rain days
- 18/mo
- Crowds
- moderate
Spring in Koh Samui (March, April, May) brings average highs of 83°F and lows of 75°F, with about 18 rainy days per month. Expect moderate tourist crowds and average accommodation rates. The overall travel score averages 62/100, with March being the strongest month of the season at 73/100.
Summer
- Score
- 57/100
- High
- 83°F
- Low
- 75°F
- Rain days
- 21/mo
- Crowds
- moderate
Summer in Koh Samui (June, July, August) brings average highs of 83°F and lows of 75°F, with about 21 rainy days per month. Expect moderate tourist crowds and average accommodation rates. The overall travel score averages 57/100, with June being the strongest month of the season at 60/100.
Fall
- Score
- 50/100
- High
- 80°F
- Low
- 73°F
- Rain days
- 26/mo
- Crowds
- moderate
Fall in Koh Samui (September, October, November) brings average highs of 80°F and lows of 73°F, with about 26 rainy days per month. Expect moderate tourist crowds and average accommodation rates. The overall travel score averages 50/100, with September being the strongest month of the season at 52/100.
Winter
- Score
- 52/100
- High
- 78°F
- Low
- 72°F
- Rain days
- 19/mo
- Crowds
- high
Winter in Koh Samui (December, January, February) brings average highs of 78°F and lows of 72°F, with about 19 rainy days per month. Expect high tourist crowds and above average accommodation rates. The overall travel score averages 52/100, with February being the strongest month of the season at 62/100.
Crowd and cost data estimated from regional travel patterns for this destination.
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Frequently Asked Questions
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Fine-Tune Your Koh Samui Trip
Want more control? Adjust the exact weight of every factor — temperature comfort, dry weather, daylight hours, crowd levels, and cost — with interactive sliders and see scores update in real time.