Weather in Koh Samui in July
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for July in Koh Samui.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youKoh Samui in July is hot — daytime temperatures average 30.0°C, dropping to 25.9°C at night. The month is fairly wet (22 rainy days on average), with roughly 8.8 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 July
Search flights to Koh Samui
Compare 100+ airlines for July — 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 July
- 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 July a good time to visit Koh Samui?
July rates 9/10 for visiting Koh Samui — excellent time to visit. Expect average highs of 30.0°C, 149.9mm of rain across the month and about 8.8 hours of daily sunshine.
What is the temperature in Koh Samui in July?
In July, Koh Samui has average highs of 30.0°C (86.0°F) and average lows of 25.9°C (78.6°F).
Does it rain in Koh Samui in July?
Some rain is likely. Koh Samui averages 149.9mm across about 22 rainy days in July, so a light waterproof layer is worth packing.
What should I wear in Koh Samui in July?
For Koh Samui in July (30.0°C highs / 25.9°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Koh Samui in July
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.