May · Cambodia
Best time to visit Siem Reap in May Weather, crowds & prices
Weather in Siem Reap in May
Average temperature 29°C, 278 mm of rain, about 29 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
3.0/10
Ranked #12 of 12 months
- Avg temp
- 29°C
- Rainfall
- 278 mm
- Humidity
- 79%
- Days with 6h+ sun
- 29
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
May in Siem Reap scores 3.0/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 29°C, 278 mm of rain, and roughly 29 days with 6+ hours of sunshine this month.
Siem Reap is the base for Angkor's temples, with a river town of markets and cafés beside it.
May in Siem Reap: expect compromises
Days in May average 29°C (84°F) and humidity near 79% — 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 278 mm, but with about 29 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3/10 on the same scale — 12th of 12 months, versus 8.4/10 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.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, December is materially better in Siem Reap — 5.4 points higher on the same scale.
Frequently asked
- What is the weather like in Siem Reap in May?
- In May, Siem Reap averages 29°C, 278 mm of rain, and about 29 days with 6+ hours of sunshine. Its climate-comfort score is 3.0/10.
- Is May a good time to visit Siem Reap?
- May earns a 3.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Siem Reap in May?
- Expect about 278 mm of rain in May. Average humidity is 79% and there are about 29 days with 6+ hours of sunshine.
Curated in Siem Reap
Tickets & experiences
Things to do in Siem Reap
Siem Reap, Cambodia. Live activities and tours from GetYourGuide, matched to this destination.