Vietnam Hanoi Weather in May — Climate Guide
May in Hanoi is moderate
Hanoi Weather in May — Quick Answer
As of 2026- Avg temp
- 32° / 24°
- Rainfall
- 190mm · 15 days
- Crowds
- Moderate
As of 2026, Hanoi in May averages a high of 32°C and low of 24°C with 190mm of rain over about 15 days. Hot + humid + monsoon starts — light moisture-wicking fabrics + sun hat + reef-safe sunscreen SPF 50 (UV 10 extreme). Compact rain jacket essential for afternoon thunderstorms.
May is moderate for Hanoi.
May is the southwest monsoon onset — afternoon thunderstorms (14:00-17:00) become a daily pattern. Mornings are typically clear and humid; afternoons bring brief intense rainfall; evenings clear again. The pattern is so predictable you can plan around it: outdoor activities 7-13:00, indoor museum/spa 14-17:00, sunset walks 17:30-19:00.
Temperature climbs to 24-32°C / 75-90°F with humidity at 84% — feels significantly hotter than the number suggests. UV index peaks at 10 (extreme). Hanoi locals slow their pace; midday outdoor activity becomes uncomfortable.
Travel score
Monsoon starts — daily afternoon thunderstorms + value pricing
May Weather at a Glance
May averages 90°F / 32°C highs and 75°F / 24°C lows with 15 rainy days and 190mm rainfall — first true monsoon month. Humidity 84%. UV index 10 extreme. Sunshine 6 hours (morning clear, afternoon storms). Sunrise 5:25 AM, sunset 6:35 PM.
May Travel Advice
Plan outdoor mornings 7-13:00 + indoor afternoons 14-17:00. Pre-book Halong Bay early-morning departures (better cancellation odds). Sunscreen SPF 50 mandatory (UV 10). Mosquito repellent essential (dengue breeding season starts). Reasonable value-for-quality month for budget-conscious travelers.
Flying In from Overseas
Korean Children's Day + Buddha's Birthday + Labour Day mini-holidays drive brief regional inbound. Direct flights from Seoul $350-550, Tokyo $300-500, Singapore $200-400, Bangkok $80-150. Western shoulder season — lower European arrivals.
May Pricing Trends
Monsoon shoulder pricing: Old Quarter 3-star $40-90/night, Sofitel Metropole $350-550, Capella $350-550. Halong Bay overnight cruise $130-260. Flights from Seoul $350-550. First true value month.
Hanoi May Weather Stats
Avg High
32°C
Avg Low
24°C
Rainy Days
15
190mm total
Sunshine
6h
Daily avg
Humidity
84%
high
UV Index
10
Very high
Wind
10 km/h
Gusts 25
Sea Temp
0°C
no swimming
Crowds
Moderate
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
38 μg/m³
PM10
58 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
35°C
Nighttime
25°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 25 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Hotels 30-40% off peak
- Predictable morning-clear pattern
- Lush green landscapes
- Last cooler-temperature month before summer brutal heat
Cons
- Afternoon thunderstorms daily
- Humidity feels brutal
- UV index 10 extreme
- Halong Bay cancellation rate 20-30%
May Events & Festivals
- Southwest monsoon starts (afternoon thunderstorms)
- Labour Day (May 1)
- Buddha's Birthday (varies, mid-May)
- Western academic year ends
Hanoi in May — Full Picture
May is the southwest monsoon onset — afternoon thunderstorms (14:00-17:00) become a daily pattern. Mornings are typically clear and humid; afternoons bring brief intense rainfall; evenings clear again. The pattern is so predictable you can plan around it: outdoor activities 7-13:00, indoor museum/spa 14-17:00, sunset walks 17:30-19:00.
Temperature climbs to 24-32°C / 75-90°F with humidity at 84% — feels significantly hotter than the number suggests. UV index peaks at 10 (extreme). Hanoi locals slow their pace; midday outdoor activity becomes uncomfortable.
Hotel pricing drops 30-40% from peak. Halong Bay cruise cancellation rate climbs to 20-30% (afternoon storms). For value-focused travelers willing to work around the rain pattern: May is excellent. For first-time visitors wanting consistent weather: avoid May. Tay Ho cafes have indoor air-conditioned seating that becomes a refuge.
What to Wear & What to Pack
Hot + humid + monsoon starts — light moisture-wicking fabrics + sun hat + reef-safe sunscreen SPF 50 (UV 10 extreme). Compact rain jacket essential for afternoon thunderstorms.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current27.7°C
21°C
13/mo
Summer (Jun·Jul·Aug)
32.7°C
26°C
15.7/mo
Autumn (Sep·Oct·Nov)
28.3°C
21.7°C
9.7/mo
Winter (Dec·Jan·Feb)
20°C
14.7°C
7.3/mo
Hanoi Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 19° | 14° | 7d·25mm | 3h | 80% | 4 | Moderate | Shoulder | |
| 20° | 15° | 9d·30mm | 2h | 82% | 4 | Moderate | Peak | |
| 23° | 18° | 13d·45mm | 2h | 85% | 5 | Moderate | Shoulder | |
| 28° | 21° | 11d·90mm | 4h | 84% | 7 | Busy | Shoulder | |
| 32° | 24° | 15d·190mm | 6h | 84% | 10 | Moderate | Shoulder | |
| 33° | 26° | 14d·240mm | 6h | 83% | 10 | Moderate | Low season | |
| 33° | 26° | 16d·270mm | 6h | 84% | 10 | Busy | Shoulder | |
| 32° | 26° | 17d·320mm | 6h | 85% | 9 | Busy | Shoulder | |
| 31° | 24° | 14d·250mm | 6h | 84% | 9 | Moderate | Shoulder | |
| October (Best) | 29° | 22° | 9d·100mm | 5h | 80% | 7 | Very busy | Peak |
| November (Best) | 25° | 19° | 6d·50mm | 5h | 75% | 6 | Very busy | Peak |
| December (Best) | 21° | 15° | 6d·25mm | 4h | 75% | 5 | Very busy | Peak |
View Other Months
Hanoi May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Hanoi?
Hanoi in May is moderate. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Hanoi in May?
Hanoi May averages a high of 32°C and a low of 24°C.
Does it rain much in Hanoi in May?
Hanoi May averages 190mm of rainfall over about 15 rainy days.
What should I wear in Hanoi in May?
Hot + humid + monsoon starts — light moisture-wicking fabrics + sun hat + reef-safe sunscreen SPF 50 (UV 10 extreme). Compact rain jacket essential for afternoon thunderstorms.
What time are sunrise and sunset in Hanoi in May?
Hanoi May sunrise is 05:25 and sunset is 18:35, with 13h 10min of daylight.
What's the air quality like in Hanoi in May?
Hanoi May air quality (AQI) averages 85, rated Moderate. PM2.5 averages 38μg/m³.
What activities are recommended in Hanoi in May?
In May, Hanoi is great for Morning Old Quarter walking (7-12:00), Indoor museums afternoon, Halong Bay morning cruises.
Is May peak season in Hanoi?
Hanoi May crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Hanoi
View Other Months
Planning a May trip to Hanoi?
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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.