SeasonMapChiang Mai vs Ko Samui: which is better, month by month
Ko Samui beats Chiang Mai in 8 of 12 months — its lead peaks in August (82 vs 46) — while Chiang Mai wins November to December; they are within 3 points in January and October.
Each place is scored under the lens that suits its type — they are different kinds of destination, so the scores are each place at its own best. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.
Chiang Mai vs Ko Samui — all 12 months
| Month | Chiang Mai | Ko Samui | Winner | Gap |
|---|---|---|---|---|
| January | 87Ahot, dry | 84Ahot, rainy, muggy air | Tie | 3 |
| February | 82Asweltering, dry | 88Asweltering, a little rain, muggy air | Ko Samui | 6 |
| March | 65Csweltering, dry | 90Ssweltering, a little rain, muggy air | Ko Samui | 25 |
| April | 54Dsweltering, dry | 80Asweltering, rainy, clean air | Ko Samui | 26 |
| May | 52Dsweltering, rainy | 77Bsweltering, rainy, clean air | Ko Samui | 25 |
| June | 60Csweltering, rainy, clean air | 83Asweltering, a little rain, clean air | Ko Samui | 23 |
| July | 53Dsweltering, soaked, clean air | 78Bsweltering, rainy, clean air | Ko Samui | 25 |
| August | 46Fsweltering, soaked, clean air | 82Asweltering, a little rain, clean air | Ko Samui | 36 |
| September | 49Fsweltering, soaked, muggy air | 73Bsweltering, rainy, clean air | Ko Samui | 24 |
| October | 61Csweltering, soaked, muggy air | 62Csweltering, soaked, clean air | Tie | 1 |
| November | 74Bsweltering, a little rain, muggy air | 59Dsweltering, soaked, clean air | Chiang Mai | 15 |
| December | 84Ahot, dry | 70Bhot, soaked, muggy air | Chiang Mai | 14 |
A month is a tie when the two are within 3 points. The widest gap is August (46 vs 82). Tap a month for that month's temperature, rain, humidity and air quality side by side.