← Weather to Go When
Thailand
Best time to visit Koh Samui
Based on 0 years of real historical weather data (2015–2026). Sunshine hours, rainfall, and temperature — week by week.
⭐ Best week
W6 · Feb 5–11
🌡 25.5°C avg☀️ 11.0h sun/day🌧 1.0mm/day
Weather score: 83/100
28.0°C
Avg summer temp
25.3°C
Avg winter temp
9.9h
Avg sunshine / day
4.3mm
Avg rainfall / day
Month-by-month weather
January77/100
🌡 25.1°C☀️ 10.0h🌧 Moderate rain
February83/100
🌡 25.7°C☀️ 10.7h🌧 Light showers
March79/100
🌡 27.1°C☀️ 10.9h🌧 Light showers
April74/100
🌡 28.0°C☀️ 11.1h🌧 Moderate rain
May66/100
🌡 28.2°C☀️ 10.6h🌧 Moderate rain
June70/100
🌡 28.0°C☀️ 9.9h🌧 Light showers
July73/100
🌡 27.9°C☀️ 9.5h🌧 Moderate rain
August74/100
🌡 28.0°C☀️ 9.8h🌧 Light showers
September59/100
🌡 26.9°C☀️ 8.5h🌧 Moderate rain
October60/100
🌡 26.0°C☀️ 9.0h🌧 Heavy rain
November58/100
🌡 25.6°C☀️ 8.7h🌧 Heavy rain
December77/100
🌡 25.2°C☀️ 9.7h🌧 Moderate rain
All weeks ranked by weather score
| Week | Dates | Avg temp | Range | Sun / day | Rain / day | Score |
|---|---|---|---|---|---|---|
| W6 | Feb 5–11 | 25.5°C | 20.8°–26.3° | 11.0h | 1.0mm | 83 |
| W7 | Feb 12–18 | 25.7°C | 21.5°–26.5° | 10.9h | 1.6mm | 81 |
| W9 | Feb 26–Mar 3 | 26.0°C | 22.0°–26.7° | 10.9h | 1.4mm | 80 |
| W10 | Mar 4–10 | 26.6°C | 21.7°–27.2° | 10.9h | 1.2mm | 79 |
| W11 | Mar 11–17 | 27.1°C | 22.0°–27.6° | 11.1h | 0.8mm | 79 |
| W5 | Jan 29–Feb 4 | 25.3°C | 21.3°–26.1° | 10.5h | 1.9mm | 78 |
| W2 | Jan 8–14 | 25.2°C | 21.4°–25.9° | 10.6h | 2.2mm | 77 |
| W4 | Jan 22–28 | 25.1°C | 20.7°–25.8° | 10.5h | 2.3mm | 77 |
| W51 | Dec 16–22 | 25.2°C | 21.6°–26.2° | 10.3h | 2.4mm | 77 |
| W8 | Feb 19–25 | 25.8°C | 21.7°–26.5° | 10.0h | 2.4mm | 76 |
| W12 | Mar 18–24 | 27.5°C | 22.4°–28.4° | 11.2h | 1.4mm | 75 |
| W15 | Apr 8–14 | 28.3°C | 23.4°–29.1° | 11.6h | 1.3mm | 74 |
| W33 | Aug 12–18 | 28.1°C | 23.4°–28.8° | 10.5h | 1.4mm | 74 |
| W28 | Jul 8–14 | 27.9°C | 23.2°–28.9° | 9.9h | 1.7mm | 73 |
| W52 | Dec 23–29 | 25.3°C | 21.3°–26.0° | 9.7h | 3.3mm | 72 |
| W3 | Jan 15–21 | 25.2°C | 21.2°–25.9° | 10.0h | 3.7mm | 71 |
| W26 | Jun 24–30 | 28.2°C | 23.2°–29.1° | 9.9h | 2.1mm | 70 |
| W31 | Jul 29–Aug 4 | 27.9°C | 23.4°–28.9° | 9.4h | 2.0mm | 70 |
| W32 | Aug 5–11 | 27.9°C | 23.1°–29.0° | 9.1h | 2.2mm | 70 |
| W34 | Aug 19–25 | 28.3°C | 23.1°–29.3° | 10.1h | 2.1mm | 70 |
| W16 | Apr 15–21 | 28.3°C | 23.6°–29.2° | 11.5h | 2.4mm | 69 |
| W13 | Mar 25–31 | 27.2°C | 22.3°–28.1° | 10.4h | 3.3mm | 68 |
| W24 | Jun 10–16 | 28.2°C | 23.3°–29.3° | 10.5h | 2.7mm | 67 |
| W27 | Jul 1–7 | 28.3°C | 23.4°–29.3° | 9.2h | 2.4mm | 67 |
| W17 | Apr 22–28 | 28.4°C | 23.5°–29.4° | 11.2h | 2.6mm | 66 |
| W19 | May 6–12 | 28.4°C | 23.6°–29.4° | 11.2h | 2.6mm | 66 |
| W23 | Jun 3–9 | 27.8°C | 23.5°–29.0° | 9.9h | 2.9mm | 66 |
| W25 | Jun 17–23 | 27.9°C | 22.9°–28.9° | 9.5h | 2.9mm | 66 |
| W30 | Jul 22–28 | 27.7°C | 22.7°–28.6° | 9.9h | 3.2mm | 66 |
| W22 | May 27–Jun 2 | 27.8°C | 23.4°–28.7° | 10.2h | 3.0mm | 65 |
| W35 | Aug 26–Sep 1 | 27.8°C | 22.7°–28.9° | 9.9h | 3.3mm | 65 |
| W21 | May 20–26 | 28.4°C | 23.3°–29.4° | 9.9h | 3.4mm | 63 |
| W20 | May 13–19 | 28.4°C | 23.3°–29.2° | 10.7h | 3.4mm | 62 |
| W50 | Dec 9–15 | 25.4°C | 21.6°–26.1° | 10.3h | 6.3mm | 61 |
| W41 | Oct 7–13 | 26.2°C | 21.9°–26.9° | 10.1h | 4.7mm | 60 |
| W36 | Sep 2–8 | 27.3°C | 22.7°–28.3° | 8.4h | 3.8mm | 59 |
| W37 | Sep 9–15 | 27.2°C | 22.6°–28.4° | 8.7h | 4.6mm | 58 |
| W47 | Nov 18–24 | 25.9°C | 21.6°–26.6° | 9.5h | 6.2mm | 58 |
| W29 | Jul 15–21 | 27.6°C | 22.7°–28.8° | 9.0h | 4.7mm | 57 |
| W18 | Apr 29–May 5 | 27.9°C | 23.2°–29.2° | 10.8h | 4.9mm | 56 |
| W39 | Sep 23–29 | 26.6°C | 22.4°–27.4° | 9.1h | 5.7mm | 56 |
| W1 | Jan 1–7 | 24.8°C | 21.4°–25.6° | 8.9h | 15.6mm | 53 |
| W46 | Nov 11–17 | 25.5°C | 21.7°–26.4° | 9.4h | 8.8mm | 53 |
| W14 | Apr 1–7 | 27.2°C | 22.5°–28.4° | 10.0h | 8.3mm | 52 |
| W43 | Oct 21–27 | 26.0°C | 21.6°–26.7° | 9.3h | 7.4mm | 52 |
| W38 | Sep 16–22 | 26.6°C | 22.1°–27.9° | 7.9h | 6.7mm | 51 |
| W49 | Dec 2–8 | 24.9°C | 21.6°–26.0° | 8.5h | 12.6mm | 50 |
| W40 | Sep 30–Oct 6 | 26.1°C | 22.3°–27.3° | 8.1h | 7.6mm | 49 |
| W42 | Oct 14–20 | 26.0°C | 21.8°–26.9° | 8.4h | 7.9mm | 49 |
| W44 | Oct 28–Nov 3 | 25.7°C | 21.7°–26.9° | 8.9h | 9.9mm | 49 |
| W48 | Nov 25–Dec 1 | 25.4°C | 21.6°–26.4° | 8.0h | 12.9mm | 47 |
| W45 | Nov 4–10 | 25.5°C | 21.6°–26.3° | 8.0h | 11.0mm | 45 |
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