Weather in Koh Samui in October
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for October in Koh Samui.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youKoh Samui in October is hot — daytime temperatures average 28.5°C, dropping to 24.8°C at night. The month is very wet, with around 28 rainy days, with roughly 8.5 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit Koh Samui — every month compared. Once you know when to go, find your Koh Samui packing list at 247PackingList.
Get ready for Koh Samui in October
Search flights to Koh Samui
Compare 100+ airlines for October — one search, best price.
Search Flights →Lightweight travel clothing
Lightweight, breathable clothing and a compact travel umbrella are essential in this climate.
Check Price →What to pack for Koh Samui in October
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Koh Samui
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 28.5°C | 43.1mm | 10/10 |
| February | 29.0°C | 58.2mm | 10/10 |
| March | 30.5°C | 36.5mm | 10/10 |
| April | 31.1°C | 106.9mm | 9/10 |
| May | 31.0°C | 134.5mm | 9/10 |
| June | 30.6°C | 102.4mm | 9/10 |
| July | 30.0°C | 149.9mm | 9/10 |
| August | 30.4°C | 114.2mm | 9/10 |
| September | 29.2°C | 196.8mm | 9/10 |
| October | 28.5°C | 244.4mm | 8/10 |
| November | 28.1°C | 323.1mm | 8/10 |
| December | 27.9°C | 161.7mm | 9/10 |
Full month-by-month guide: best time to visit Koh Samui →
For facts about Thailand — currency, language and dialling code — see our Thailand country guide at 247CountryInfo. Travellers also find it useful to keep a Koh Samui travel guide to hand. Check clothing sizes in Thailand before you shop.
Frequently Asked Questions
Is October a good time to visit Koh Samui?
October rates 8/10 for visiting Koh Samui — good time to visit. Expect average highs of 28.5°C, 244.4mm of rain across the month and about 8.5 hours of daily sunshine.
What is the temperature in Koh Samui in October?
In October, Koh Samui has average highs of 28.5°C (83.3°F) and average lows of 24.8°C (76.6°F).
Does it rain in Koh Samui in October?
Yes — October is one of the wetter months in Koh Samui, averaging 244.4mm of rain over roughly 28 rainy days. Pack for heavy showers.
What should I wear in Koh Samui in October?
For Koh Samui in October (28.5°C highs / 24.8°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Koh Samui in October
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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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.