Weather in Koh Samui in August
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn August, Koh Samui sees average highs of 30.4°C (86.7°F) and lows of 26.0°C. Conditions are hot and fairly wet (21 rainy days on average), with roughly 9.4 hours of sunshine a day. It is one of the best months of the year to visit. 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 August
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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 August
- Lightweight, breathable clothing
- High SPF sunscreen
- Sunglasses
- Sun hat
- Reusable water bottle
- 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 August a good time to visit Koh Samui?
August rates 9/10 for visiting Koh Samui — excellent time to visit. Expect average highs of 30.4°C, 114.2mm of rain across the month and about 9.4 hours of daily sunshine.
What is the temperature in Koh Samui in August?
In August, Koh Samui has average highs of 30.4°C (86.7°F) and average lows of 26.0°C (78.8°F).
Does it rain in Koh Samui in August?
Some rain is likely. Koh Samui averages 114.2mm across about 21 rainy days in August, so a light waterproof layer is worth packing.
What should I wear in Koh Samui in August?
For Koh Samui in August (30.4°C highs / 26.0°C lows), pack lightweight, breathable clothing plus high spf sunscreen, sunglasses, sun hat.
More essentials for Koh Samui in August
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
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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.