UV Index in Hanoi, Vietnam

Last updated: May 3, 2025

In Hanoi, Vietnam, staying informed about the UV Index is crucial for maintaining skin health and preventing sunburn. With the city's Cwa climate, characterized by hot summers and a blend of sun and humidity, understanding the variations in UV levels can safeguard your skin from harmful rays, especially during peak hours when the UV Index soars above 10. The midday sun can be particularly intense, making it essential for residents and visitors alike to stay vigilant and take protective measures. By being aware of UV exposure risks, you can enjoy the vibrant outdoor lifestyle of Hanoi while keeping your skin safe and healthy.

Hourly UV Index in Hanoi

The UV Index today showcases a dynamic progression, starting from a mild 2 at 7:00 AM, gradually escalating to a peak of 13 by noon. As the sun reaches its zenith, the UV levels soar to 12 at 11:00 AM, suggesting strong sun exposure is imminent. The afternoon sees a gentle decline, with values dropping to 5 by 3:00 PM, before tapering off to 1 as the evening settles in. It's clear that the mid-morning to early afternoon hours represent the most critical time for sun exposure, making it vital to protect your skin during those peak UV hours!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	2	low	45 min
08:00	4	moderate	30 min
09:00	7	high	25 min
10:00	10	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	11	extreme	10 min
14:00	8	very high	15 min
15:00	5	moderate	30 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Hanoi

The UV Index reflects significant seasonal variations, with the highest levels occurring from March to October, where values frequently reach between 12 and 13 in the extreme exposure category. January and February are marked as very high with indices of 8 and 10 respectively, while November maintains a very high level of 9 before dropping to high in December at 7. High-risk months are primarily from March to September, where the burn time is drastically reduced to just 10 minutes during peak hours. For both residents and visitors, it is crucial to take precautions during these peak UV periods, such as wearing protective clothing, applying broad-spectrum sunscreen, and limiting sun exposure, especially during midday hours to minimize the risk of skin damage.

Monthly Maximum UV Index for Hanoi, Vietnam

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Hanoi. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Hanoi, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Hanoi UV Index with Other Vietnam Cities

The table above highlights how UV exposure in Hanoi compares to other major locations across Vietnam. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Hanoi's solar exposure compared to other cities in Vietnam. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hanoi	8	10	12	12	13	12	12	13	13	11	9	7
Haiphong UVI	8	10	12	13	12	13	13	13	13	11	9	7
Da Nang UVI	10	12	14	15	14	13	14	14	13	12	10	9
Ho Chi Minh City UVI	10	13	15	14	14	12	13	14	13	13	11	10
Bien Hoa UVI	10	14	15	15	14	13	14	14	13	12	11	10