Koh Samui or Krabi in March?
On climate data, Koh Samui comes out ahead overall in March. See the per-criterion details below.
Koh SamuiPhoto: Sonia Selivonchik · CC BY-SA 4.0
KrabiPhoto: kallerna · CC BY-SA 3.0Key figures in March
| Criterion | Koh Samui | Krabi |
|---|---|---|
| Average daily high | 29 °C | 31 °C |
| Average daily low | 27 °C | 25 °C |
| Sea | 29 °C | 29 °C |
| Rainy days | 9 rainy days (est.) ★ | 12 rainy days (est.) |
| Sun | 8 h/day | 8 h/day |
| Humidity | 78 % | 78 % |
Winner by travel type
Trade-offs
- Krabi is about 2 °C warmer by day.
- Koh Samui is drier, with about 2 fewer rainy days.
Koh Samui or Krabi in March: the short answer
In March, Koh Samui comes out ahead on the overall climate score (Koh Samui 75/100 vs Krabi 63/100). That is a snapshot of one month, though — which one truly fits depends on what you want from the trip, so the breakdown below goes criterion by criterion.
This comparison focuses on March as a representative month for the pair; for any other month, use each destination's month-by-month pages. Across the whole year Koh Samui averages a climate score of 61/100, Krabi 59/100. Both profiles below are historical monthly averages, not a forecast.
Weather in March, side by side
The average daily high is about 29 °C in Koh Samui and 31 °C in Krabi — warmer in Krabi. Average daily lows are around 27 °C versus 25 °C.
On rain, Koh Samui sees about 9 rainy days in March and Krabi about 12 — drier in Koh Samui. Sunshine is comparable (8 vs 8 hours a day).
Sea temperature and swimming
In March the water is about 29 °C at Koh Samui and 29 °C at Krabi. Over the year, Koh Samui is comfortable for swimming (from ~21 °C) in January, February, March, April, May, June, July, August, September, October, November and December, Krabi in January, February, March, April, May, June, July, August, September, October, November and December. Peak sea warmth is May for Koh Samui and May for Krabi.
Rain and sun across the year
Over a full year Koh Samui records roughly 246 rainy days and Krabi about 243 — the drier of the two overall is Krabi. At their sunniest, Koh Samui reaches about 8 hours of sun a day (March) and Krabi about 8 (March). If dependable dry, sunny weather is your top priority, weigh these annual totals alongside the single month above.
Best time to visit each
Climatically, Koh Samui is at its best in January, February, March and December, while Krabi peaks in January, February, March and December. If your dates are fixed, pick the destination whose strong season overlaps them; if you are flexible, plan around these windows.
Which suits which kind of trip
Based on the March scores for each travel style:
Beach & swimming: Koh Samui scores higher in March (Koh Samui 83 vs Krabi 73).
City breaks: Koh Samui scores higher in March (Koh Samui 75 vs Krabi 62).
Active & hiking: Koh Samui scores higher in March (Koh Samui 58 vs Krabi 47).
Family: Koh Samui scores higher in March (Koh Samui 78 vs Krabi 64).
Verdict: which should you pick?
In March, Koh Samui leads across every scored category here — the overall score and each travel type — so on the climate data it is the clearer pick this month. Over the year, Koh Samui carries the higher overall climate score. Your own priority (sun, sea, low rain or sightseeing comfort) still matters, and the month-by-month pages for each destination give you the full picture before you book.