Koh Samui in Autumn — Weather & What to Expect
Autumn in Koh Samui (September, October, November) averages daytime highs of 28.6°C and lows of 24.9°C, with around 764.3mm of rain across the season (76 rainy days in total). It includes some of the best months of the year to visit (September, October, November).
In the northern hemisphere, autumn in Koh Samui covers September, October, November.
Autumn in Koh Samui month by month
| Month | High | Low | Rain | Rainy days | Rating |
|---|---|---|---|---|---|
| September | 29.2°C | 25.4°C | 196.8mm | 22 | 9/10 |
| October | 28.5°C | 24.8°C | 244.4mm | 28 | 8/10 |
| November | 28.1°C | 24.5°C | 323.1mm | 26 | 8/10 |
What to pack for Koh Samui in autumn
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Frequently Asked Questions
Is autumn a good time to visit Koh Samui?
Autumn in Koh Samui rates around 8/10 — good time to visit. Average highs are 28.6°C with 764.3mm of rain across the season.
How hot is Koh Samui in autumn?
Daytime highs average 28.6°C (83.5°F) across September, October, November, with nights around 24.9°C.
What months are autumn in Koh Samui?
Koh Samui is in the northern hemisphere, so autumn covers September, October, November.
See also: best time to visit Koh Samui · Koh Samui annual climate · Koh Samui in spring · Koh Samui in summer · Koh Samui in winter
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Once you know what autumn in Koh Samui looks like, find out exactly what to pack for Koh Samui at 247PackingList. For currency, language and country facts, see the Thailand guide at 247CountryInfo.
Autumn in Koh Samui — what to pack
Lightweight travel clothing
Lightweight, breathable clothing and a compact travel umbrella are essential in this climate.
Check Price →Check clothing sizes in Thailand at 247Sizing before you shop.
More autumn travel essentials
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.