May · Thailand
Best time to visit Koh Lanta in May Weather, crowds & prices
Weather in Koh Lanta in May
Average temperature 29°C, 233 mm of rain, about 20 days with 6+ hours of sunshine and 84% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
6.3/10
Ranked #6 of 12 months
- Avg temp
- 29°C
- Rainfall
- 233 mm
- Humidity
- 84%
- Days with 6h+ sun
- 20
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
May in Koh Lanta scores 6.3/10 for beach and coastal travel - an above-average month (#6 of 12). Expect around 29°C, 233 mm of rain, and roughly 20 days with 6+ hours of sunshine this month.
Koh Lanta's quiet beaches and long sunsets suit families and travellers avoiding the crowds.
May in Koh Lanta — middling scores, decent value
Days in May average 29°C (83°F) and humidity near 84% — 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 233 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 6.3/10 on the same scale — 6th of 12 months, versus 8.7/10 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. That combination — decent conditions at the lowest rates of the year — is the best value window on this page.
If your dates are flexible, February is materially better in Koh Lanta — 2.4 points higher on the same scale.
Frequently asked
- What is the weather like in Koh Lanta in May?
- In May, Koh Lanta averages 29°C, 233 mm of rain, and about 20 days with 6+ hours of sunshine. Its climate-comfort score is 6.3/10.
- Is May a good time to visit Koh Lanta?
- May earns a 6.3/10 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 Lanta in May?
- Expect about 233 mm of rain in May. Average humidity is 84% and there are about 20 days with 6+ hours of sunshine.
Curated in Koh Lanta
Tickets & experiences
Things to do in Koh Lanta
Koh Lanta, Thailand. Live activities and tours from GetYourGuide, matched to this destination.