Click on a day for an hourly weather forecast
The temperatures in Koh Samui during July are extremely high, between 27°C and hot as 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of July in Koh Samui. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Koh Samui in July 2025.
If you’re planning to visit Koh Samui in the near future, we highly recommend that you review the 14 day weather forecast for Koh Samui before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 27° / 26° | 8 | 23 | 0 | 326 mm | Good | Koh Samui in January |
| February | 28° / 26° | 3 | 25 | 0 | 87 mm | Perfect | Koh Samui in February |
| March | 28° / 27° | 5 | 26 | 0 | 178 mm | Perfect | Koh Samui in March |
| April | 29° / 28° | 7 | 23 | 0 | 171 mm | Ok | Koh Samui in April |
| May | 30° / 28° | 7 | 24 | 0 | 155 mm | Ok | Koh Samui in May |
| June | 30° / 28° | 9 | 21 | 0 | 184 mm | Ok | Koh Samui in June |
| July | 29° / 27° | 8 | 23 | 0 | 163 mm | Ok | Koh Samui in July |
| August | 29° / 27° | 8 | 23 | 0 | 150 mm | Ok | Koh Samui in August |
| September | 29° / 27° | 10 | 20 | 0 | 188 mm | Ok | Koh Samui in September |
| October | 29° / 27° | 14 | 17 | 0 | 368 mm | Ok | Koh Samui in October |
| November | 29° / 27° | 17 | 13 | 0 | 565 mm | Ok | Koh Samui in November |
| December | 28° / 27° | 11 | 20 | 0 | 368 mm | Good | Koh Samui in December |