Ko Samui vs Krabi: which is sunnier?
🇹🇭 Thailand vs 🇹🇭 Thailand · 200 km apart · long-term climate normals (NASA POWER, 2001–2020)
Ko Samui is the sunnier overall: about 2,342 hours of sunshine a year to Krabi's 2,260. Month by month it's balanced: each has the higher Sunshine Score in 1 month, with 10 within 2 points.
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| Ko Samui | Krabi | |
|---|---|---|
| Sunshine hours / year | 2,342 | 2,260 |
| Sunniest month | February (86/100) | February (87/100) |
| Nov–Feb average score | 71/100 | 74/100 |
| Jun–Aug average score | 65/100 | 65/100 |
| Rain / year | 2,088 mm | 2,384 mm |
| Warmest sea | 33°C / 91°F | 33°C / 91°F |
| Peak midday UV | 11 (extreme) | 11 (extreme) |
Ko Samui vs Krabi month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| Ko Samui | Krabi | Ko Samui | Krabi | Ko Samui | Krabi | Ko Samui | Krabi | |
| January | 68 | 75 | 28° | 28° | 135 | 93 | 29° | 30° |
| February | 86 | 87 | 28° | 29° | 38 | 25 | 30° | 30° |
| March | 72 | 73 | 29° | 31° | 114 | 106 | 30° | 31° |
| April | 76 | 68 | 30° | 31° | 90 | 130 | 32° | 33° |
| May | 65 | 65 | 30° | 29° | 170 | 237 | 33° | 33° |
| June | 65 | 65 | 30° | 29° | 167 | 259 | 31° | 31° |
| July | 65 | 65 | 29° | 28° | 166 | 243 | 31° | 31° |
| August | 66 | 65 | 29° | 28° | 144 | 277 | 31° | 31° |
| September | 65 | 65 | 29° | 28° | 181 | 326 | 30° | 30° |
| October | 65 | 65 | 28° | 28° | 246 | 317 | 31° | 31° |
| November | 65 | 65 | 28° | 28° | 375 | 232 | 30° | 30° |
| December | 65 | 67 | 28° | 28° | 262 | 139 | 29° | 30° |
The sunnier month by month: Jan Krabi · Feb even · Mar even · Apr Ko Samui · May even · Jun even · Jul even · Aug even · Sep even · Oct even · Nov even · Dec even.
When to pick which
- November–February: Krabi (average score 74/100 vs 71). Daytime highs are similar (28°C vs 28°C). See the winter sun ranking.
- March–May: too close to call — Ko Samui averages 71/100, Krabi 69/100. Daytime highs are similar (30°C vs 30°C).
- June–August: too close to call — Ko Samui averages 65/100, Krabi 65/100. Daytime highs are similar (29°C vs 28°C).
- September–October: too close to call — Ko Samui averages 65/100, Krabi 65/100. Daytime highs are similar (29°C vs 28°C).
Sea temperature
Both seas peak at 33°C / 91°F. Swimmable water (21°C+): Ko Samui all year, Krabi all year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: Ko Samui weather by month · Krabi weather by month · Best time to visit Thailand.
More comparisons: Ko Samui vs Nakhon Si Thammarat · Ko Samui vs Surat Thani · Ko Samui vs Rayong · Krabi vs Nakhon Si Thammarat · Krabi vs Surat Thani · Krabi vs Phuket · all head-to-heads