May · Thailand
Best time to visit Koh Tao in May Weather, crowds & prices
Weather in Koh Tao in May
Average temperature 30°C, 261 mm of rain, about 21 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
6.6/10
Ranked #7 of 12 months
- Avg temp
- 30°C
- Rainfall
- 261 mm
- Humidity
- 78%
- Days with 6h+ sun
- 21
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
May in Koh Tao scores 6.6/10 for beach and coastal travel - ranked #7 of 12. Expect around 30°C, 261 mm of rain, and roughly 21 days with 6+ hours of sunshine this month.
Ko Tao is Thailand's dive-cert island-compact coves, training reefs, and a backpacker nightlife pocket in Mae Haad. Best window: the drier months outside peak monsoon.
May in Koh Tao: mixed conditions, plan around the weather
Days in May average 30°C (86°F) and humidity near 78% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 261 mm, but with about 21 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 6.6/10 on the same scale — 7th of 12 months, versus 9.2/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, March is materially better in Koh Tao — 2.6 points higher on the same scale.
Frequently asked
- What is the weather like in Koh Tao in May?
- In May, Koh Tao averages 30°C, 261 mm of rain, and about 21 days with 6+ hours of sunshine. Its climate-comfort score is 6.6/10.
- Is May a good time to visit Koh Tao?
- May earns a 6.6/10 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 Tao in May?
- Expect about 261 mm of rain in May. Average humidity is 78% and there are about 21 days with 6+ hours of sunshine.
Curated in Koh Tao
Tickets & experiences
Things to do in Koh Tao
Koh Tao, Thailand. Live activities and tours from GetYourGuide, matched to this destination.