April · Thailand
Best time to visit Koh Samui in April Weather, crowds & prices
Weather in Koh Samui in April
Average temperature 26°C, 89 mm of rain, about 28 days with 6+ hours of sunshine and 76% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
April score
8.4/10
Ranked #5 of 12 months
- Avg temp
- 26°C
- Rainfall
- 89 mm
- Humidity
- 76%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
April in Koh Samui scores 8.4/10 for beach and coastal travel - an above-average month (#5 of 12). Expect around 26°C, 89 mm of rain, and roughly 28 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.
April holds up well in Koh Samui — 5th best month
Days in April average 26°C (79°F) and humidity near 76% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 89 mm of rain this month — a flexible day or two helps — with about 28 days with 6+ hours of sunshine and 12.3 hours of daylight to work around it.
That is 8.4/10 on the same scale — 5th of 12 months, versus 9.3/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
Expect mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Koh Samui in April?
- In April, Koh Samui averages 26°C, 89 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 8.4/10.
- Is April a good time to visit Koh Samui?
- April earns a 8.4/10 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 April?
- Expect about 89 mm of rain in April. Average humidity is 76% and there are about 28 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.