July · Thailand
Best time to visit Koh Samui in July Weather, crowds & prices
Weather in Koh Samui in July
Average temperature 26°C, 114 mm of rain, about 24 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
July score
8.0/10
Ranked #6 of 12 months
- Avg temp
- 26°C
- Rainfall
- 114 mm
- Humidity
- 78%
- Days with 6h+ sun
- 24
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
July in Koh Samui scores 8.0/10 for beach and coastal travel - an above-average month (#6 of 12). Expect around 26°C, 114 mm of rain, and roughly 24 days with 6+ hours of sunshine this month.
Koh Samui's ring road links Chaweng's beach, Bophut's Fisherman's Village, and the Big Buddha on the north coast.
July in Koh Samui — reliably good (6th best month)
With 26°C (78°F) on average, July delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
114 mm of rain makes this a wet month here, though with about 24 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 8/10 on the same scale — 6th of 12 months, versus 9.3/10 for the best month here.
Pack light clothing, swimwear and real sun protection, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Koh Samui in July?
- In July, Koh Samui averages 26°C, 114 mm of rain, and about 24 days with 6+ hours of sunshine. Its climate-comfort score is 8.0/10.
- Is July a good time to visit Koh Samui?
- July earns a 8.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Koh Samui in July?
- Expect about 114 mm of rain in July. Average humidity is 78% and there are about 24 days with 6+ hours of sunshine.
Curated in Koh Samui
Tickets & experiences
Things to do in Koh Samui
Koh Samui, Thailand. Live activities and tours from GetYourGuide, matched to this destination.