UV Index in Cat Ba, Vietnam

Last updated: June 2, 2025

In Cat Ba, Vietnam, understanding the UV Index is crucial for protecting your skin against harmful ultraviolet rays. With peak UV levels often soaring to 13 during midday, awareness of these figures can help prevent sunburn and long-term skin damage. The tropical Cwa climate of Cat Ba brings not only lush landscapes but also elevated risks of UV exposure, especially during the summer months. Keeping an eye on the UV Index allows residents and visitors alike to enjoy the beautiful outdoors while taking necessary precautions for their skin health.

Hourly UV Index in Cat Ba

As dawn breaks, the UV Index begins its journey, starting at a modest 2 at 7:00 AM. By 8:00 AM, it steadily climbs to 4, signaling the approach of stronger rays. The sun reaches its peak intensity at noon, soaring to a remarkable 13. From 11:00 AM to 1:00 PM, the index remains alarmingly high, maxing out at 12 and then gradually declining in the afternoon. By 3:00 PM, it drops to 6 and continues to wane, arriving at a gentle 1 by 5:00 PM. As the day winds down, the UV Index falls to zero by 7:00 PM, presenting a safe reprieve from the sun's rays. Remember to protect your skin during those peak hours when the sun's strength is at its highest!

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	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 Cat Ba

Throughout the year, UV Index levels fluctuate significantly, with the highest risk months being from March to October, where values consistently reach extreme levels of 10 or above. Specifically, April, June, July, August, and September all see a peak UV Index of 13, necessitating only 10 minutes of exposure before potential skin damage occurs. In contrast, the UV Index is at its lowest in December and January, with values of 7 and 8, respectively, making burn times of 25 and 15 minutes more tolerable. Visitors and residents are strongly advised to take precautionary measures during the high-risk months by wearing sunscreen, protective clothing, and seeking shade to minimize skin damage. Stay vigilant to ensure your safety while enjoying outdoor activities!

Monthly Maximum UV Index for Cat Ba, Vietnam

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

The table above highlights how UV exposure in Cat Ba 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.

Cat Ba'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
Cat Ba	8	10	12	13	12	13	13	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