Laos Vientiane Weather in May — Climate Guide
May in Vientiane is moderate
Vientiane Weather in May — Quick Answer
As of 2026- Avg temp
- 33° / 24°
- Rainfall
- 200mm · 14 days
- Crowds
- Moderate
As of 2026, Vientiane in May averages a high of 33°C and low of 24°C with 200mm of rain over about 14 days. Monsoon onset + haze clears = transition month with value. Daily 1-2 hour afternoon thunderstorms. Quick-dry clothes + packable rain shell + waterproof phone case. Days 33°C / 91°F + nights 24°C / 75°F. Light jacket for AC restaurants.
May is moderate for Vientiane.
May is the transition month — monsoon onset + haze clears + low-season pricing returns. Rainfall jumps from April's 90mm to 200mm (rainy days 6 → 14), with daily afternoon thunderstorms 14:00-17:00 the new pattern. Mornings remain mostly clear.
The big positive: haze clears completely by mid-May, air quality returns to good, and Patuxai rooftop + Mekong sunset photography becomes possible again. Pricing drops 30-40% from peak — boutique hotels $45-90/night, Crowne Plaza + Settha Palace luxury $180-380. Vientiane doesn't share the Bangkok/Bali pricing patterns — May is genuinely the value-quality crossover month.
Travel score
Haze clears + monsoon onset + value pricing returns
May Weather at a Glance
May averages 91°F / 33°C highs and 75°F / 24°C lows with 14 rainy days and 200mm of rain. Humidity 75%. UV 10. Sunshine drops to 6.5 hours. Sea/swim temperature at Mekong tributaries 28°C very warm. Daily afternoon thunderstorms 14:00-17:00; mornings + evenings often clear.
May Travel Advice
Schedule outdoor activities for mornings (08:00-13:00). Afternoon thunderstorms 14:00-17:00 = cooking class, spa, cafe time. Pre-book Buddha Park tuk-tuk for early-morning (09:00) before storms peak. Late May (May 16-31) is the year's best value window — same dry-season weather mostly, 60% of high-season pricing.
Flying In from Overseas
Monsoon onset + low season = year's lowest tourist arrivals from Western markets. Direct connection via Bangkok or Hanoi $250-450 (year's lowest). European pre-summer shoulder. Korean Golden Week (early May) drives brief regional peak.
May Pricing Trends
30-40% off peak: boutique $45-90/night, Crowne Plaza $180-380, Settha Palace $130-300. Buddha Park tuk-tuk $7-9. Flights $250-450 from East Asia. Year's best value window starts May 16.
Vientiane May Weather Stats
Avg High
33°C
Avg Low
24°C
Rainy Days
14
200mm total
Sunshine
6.5h
Daily avg
Humidity
75%
humid
UV Index
10
Very high
Wind
7 km/h
Gusts 18
Sea Temp
28°C
swimming Mekong tributary
Crowds
Moderate
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
30 μg/m³
PM10
50 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
37°C
Nighttime
25°C
Humidity and wind affect how the actual temperature feels.
Wind
7 km/h
Max gust 18 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Haze clears — air quality recovers
- 30-40% off peak hotel pricing
- Power cuts begin (weekly) — slow Wi-Fi
- Mekong gets dramatic
Cons
- Daily afternoon thunderstorms
- Mekong turns muddy
- Power cuts begin weekly
May Events & Festivals
- Monsoon officially starts mid-month
- Slash-and-burn haze clears — air quality recovers
- Low-season pricing begins — 30-40% off peak
- Mekong River starts muddy season
Vientiane in May — Full Picture
May is the transition month — monsoon onset + haze clears + low-season pricing returns. Rainfall jumps from April's 90mm to 200mm (rainy days 6 → 14), with daily afternoon thunderstorms 14:00-17:00 the new pattern. Mornings remain mostly clear.
The big positive: haze clears completely by mid-May, air quality returns to good, and Patuxai rooftop + Mekong sunset photography becomes possible again. Pricing drops 30-40% from peak — boutique hotels $45-90/night, Crowne Plaza + Settha Palace luxury $180-380. Vientiane doesn't share the Bangkok/Bali pricing patterns — May is genuinely the value-quality crossover month.
Trade-offs: Mekong River starts turning muddy. Power cuts begin (weekly during rainy season). Morning outdoor activities + afternoon hotel/cafe/cooking class pattern is the right schedule.
What to Wear & What to Pack
Monsoon onset + haze clears = transition month with value. Daily 1-2 hour afternoon thunderstorms. Quick-dry clothes + packable rain shell + waterproof phone case. Days 33°C / 91°F + nights 24°C / 75°F. Light jacket for AC restaurants.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current33.7°C
23.3°C
7.3/mo
Summer (Jun·Jul·Aug)
31.3°C
24°C
18/mo
Autumn (Sep·Oct·Nov)
30°C
21.3°C
11/mo
Winter (Dec·Jan·Feb)
29°C
17.7°C
1/mo
Vientiane Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 17° | 1d·7mm | 8.5h | 70% | 8 | Busy | Peak |
| February (Best) | 31° | 19° | 1d·15mm | 9h | 65% | 9 | Busy | Peak |
| 33° | 22° | 2d·30mm | 8.5h | 60% | 11 | Moderate | Shoulder | |
| 35° | 24° | 6d·90mm | 8h | 65% | 11 | Busy | Peak | |
| 33° | 24° | 14d·200mm | 6.5h | 75% | 10 | Moderate | Low season | |
| 32° | 24° | 16d·240mm | 6h | 80% | 10 | Quiet | Low season | |
| 31° | 24° | 19d·280mm | 5.5h | 82% | 10 | Moderate | Shoulder | |
| 31° | 24° | 19d·300mm | 5h | 83% | 9 | Moderate | Shoulder | |
| 31° | 23° | 19d·320mm | 5h | 83% | 9 | Quiet | Low season | |
| 30° | 22° | 11d·150mm | 7h | 78% | 9 | Moderate | Low season | |
| November (Best) | 29° | 19° | 3d·25mm | 8.5h | 70% | 8 | Very busy | Peak |
| December (Best) | 28° | 17° | 1d·7mm | 8.5h | 70% | 8 | Busy | Peak |
View Other Months
Vientiane May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Vientiane?
Vientiane in May is moderate. Tourist crowds are moderate and flight/hotel prices are low season.
What's the average temperature in Vientiane in May?
Vientiane May averages a high of 33°C and a low of 24°C.
Does it rain much in Vientiane in May?
Vientiane May averages 200mm of rainfall over about 14 rainy days.
What should I wear in Vientiane in May?
Monsoon onset + haze clears = transition month with value. Daily 1-2 hour afternoon thunderstorms. Quick-dry clothes + packable rain shell + waterproof phone case. Days 33°C / 91°F + nights 24°C / 75°F. Light jacket for AC restaurants.
What time are sunrise and sunset in Vientiane in May?
Vientiane May sunrise is 05:45 and sunset is 18:25, with 12h 40min of daylight.
What's the air quality like in Vientiane in May?
Vientiane May air quality (AQI) averages 60, rated Moderate. PM2.5 averages 30μg/m³.
What activities are recommended in Vientiane in May?
In May, Vientiane is great for Wat Si Saket temples (rain shelter), COPE Visitor Centre (indoor), Lao cooking class.
Is May peak season in Vientiane?
Vientiane May crowds are moderate and prices are low season. You can travel relatively comfortably without long queues.
Best Months to Visit Vientiane
View Other Months
Planning a May trip to Vientiane?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.