May · Laos
Best time to visit Si Phan Don in May Weather, crowds & prices
Weather in Si Phan Don in May
Average temperature 30°C, 180 mm of rain, about 18 days with 6+ hours of sunshine and 74% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
5.8/10
Ranked #8 of 12 months
- Avg temp
- 30°C
- Rainfall
- 180 mm
- Humidity
- 74%
- Days with 6h+ sun
- 18
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
May in Si Phan Don scores 5.8/10 for nature and wildlife travel - ranked #8 of 12. Expect around 30°C, 180 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
A tranquil archipelago of river islands on the Mekong in southern Laos, perfect during the dry season.
May in Si Phan Don — workable with trade-offs
May averages 30°C (85°F) and humidity near 74%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 180 mm this is a genuinely wet month: about 18 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 5.8/10 here, 8th of 12 months, against 9.6/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella, footwear you can get muddy.
Plan for low-season pricing, with crowds are light for this destination.
Flexible dates? January scores 3.8 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Si Phan Don in May?
- In May, Si Phan Don averages 30°C, 180 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 5.8/10.
- Is May a good time to visit Si Phan Don?
- May earns a 5.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Si Phan Don in May?
- Expect about 180 mm of rain in May. Average humidity is 74% and there are about 18 days with 6+ hours of sunshine.
Curated in Si Phan Don
Tickets & experiences
Things to do in Si Phan Don
Si Phan Don, Laos. Live activities and tours from GetYourGuide, matched to this destination.