UV Index in Hoi An, Vietnam

Last updated: July 2, 2025

In sunny Hoi An, Vietnam, understanding the UV Index is crucial for protecting your skin and overall health. With tropical weather and high UV exposure, particularly from midday to early afternoon, awareness of UV levels can significantly help prevent sunburn and long-term skin damage. The UV Index can soar as high as 14 during peak hours, making it imperative for residents and visitors alike to stay informed and take necessary precautions. Whether you're exploring the ancient town or relaxing by the beach, being mindful of the UV Index helps ensure a safe and enjoyable experience under the sun.

Hourly UV Index in Hoi An

As the sun rises, the UV Index begins its ascent, starting at a mild 2 by 7:00 AM. By 8:00 AM, it ramps up to 4, signaling the need for light sun protection. The real intensity kicks in around 9:00 AM, peaking at a robust 11 between 10:00 AM and 12:00 PM, when it reaches its highest point of 14. During these hours, it’s essential to find shade and apply sunscreen to shield yourself from harmful rays. As the afternoon progresses, the UV Index gradually declines, dropping to 12 at 1:00 PM before easing to 6 by 3:00 PM, and finally dipping to a low of 1 by 5:00 PM, signaling a retreat from the sun as daylight fades. This data emphasizes the importance of midday sun safety, ensuring maximum protection during the peak UV exposure.

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	8	very high	15 min
10:00	11	extreme	10 min
11:00	14	extreme	10 min
12:00	14	extreme	10 min
13:00	12	extreme	10 min
14:00	9	very high	15 min
15:00	6	high	25 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 Hoi An

The UV Index exhibits significant seasonal fluctuations throughout the year, with peak levels occurring from February to October. This period features extreme exposure categories, particularly from March through October, where the UV Index remains at 12 or higher, indicating a burn time of just 10 minutes. High-risk months include February, March, April, May, June, July, August, September, and October, all of which pose increased risk for skin damage. Residents and visitors are advised to take precautions during these months by wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sunlight hours to minimize UV exposure and protect their skin health. As the year progresses, levels decrease in November and December, returning to a very high exposure category, reminding individuals to stay vigilant even during the cooler months.

Monthly Maximum UV Index for Hoi An, Vietnam

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Hoi An. 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 Hoi An, 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 Hoi An UV Index with Other Vietnam Cities

The table above highlights how UV exposure in Hoi An 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.

Hoi An'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 UVI	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
Hoi An	10	12	14	15	14	13	14	14	13	12	10	9
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