UV Index in Mae Sai, Thailand

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of Mae Sai, Thailand, where the sun's rays can be particularly intense. With a tropical climate that boasts high UV levels, it’s vital to grasp how UV exposure can lead to sunburn and long-term skin damage. During the peak hours, especially between 10:00 AM and 12:00 PM, the UV Index can soar to a maximum of 14, indicating a very high risk of harm from unprotected sun exposure. By staying informed about the UV levels, you can take proactive steps to protect your skin and enjoy the sunshine safely in this vibrant region.

Hourly UV Index in Mae Sai

The UV Index data reveals a typical sun-soaked day, peaking at 14 between 11:00 AM and 12:00 PM, signaling a strong need for protection against the sun's rays. Starting the day at a modest 3 at 7:00 AM, the index climbs steadily, hitting 9 by 9:00 AM, and reaching its zenith at 10:00 AM with a blistering 13. As the afternoon rolls in, numbers dip gradually; by 3:00 PM, it falls to 5, and continues to descend to a mere 1 by 5:00 PM. Ultimately, the UV exposure wanes, reaching 0 after 6:00 PM. For those venturing out, the peak hours demand vigilance and sunscreen, especially during the midday sun.

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	3	moderate	30 min
08:00	6	high	25 min
09:00	9	very high	15 min
10:00	13	extreme	10 min
11:00	14	extreme	10 min
12:00	14	extreme	10 min
13:00	11	extreme	10 min
14:00	8	very high	15 min
15:00	5	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Mae Sai

Throughout the year, UV exposure fluctuates significantly, with the highest risks occurring during the summer months. From March to October, the UV Index reaches particularly dangerous levels, peaking at 14, categorizing this period as extreme risk, where burn time is only 10 minutes. January and February also present a high hazard with a UV Index of 9 and 10, respectively, while the latter half of the year sees a slight dip in risk during November and December, with UV Index values of 9 and 8. Visitors and residents should be aware that March to October are high-risk months, and it is essential to take protective measures during these times, such as wearing broad-spectrum sunscreen, protective clothing, and seeking shade whenever possible to minimize skin damage.

Monthly Maximum UV Index for Mae Sai, Thailand

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Mae Sai. 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 Mae Sai, 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 Mae Sai UV Index with Other Thailand Cities

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

Mae Sai's solar exposure compared to other cities in Thailand. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mae Sai	9	10	13	12	14	14	14	14	14	12	9	8
Mueang Nonthaburi UVI	10	12	14	13	14	13	14	14	13	12	9	8
Samut Prakan UVI	10	12	14	13	14	13	14	14	13	12	9	8
Bangkok UVI	10	12	14	13	14	13	14	14	13	12	9	8
Udon Thani UVI	9	11	13	14	14	13	14	14	14	12	10	9
Chon Buri UVI	10	13	14	14	14	13	14	14	13	13	10	9