UV Index in Siem Reap, Cambodia

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Siem Reap, Cambodia, where sunny days are the norm in a tropical climate. With UV levels soaring high, peaking at 13 during midday hours, awareness of these UV ratings is essential for preventing sunburn and promoting long-term skin health. As you explore this enchanting destination, from the majestic Angkor Wat to bustling local markets, staying informed about the UV Index will help you protect your skin from potential harm and enjoy all that Siem Reap has to offer safely.

Hourly UV Index in Siem Reap

The UV Index data reveals a dynamic fluctuation throughout the day, peaking at a maximum of 13 around noon. The morning starts off gently, with readings of only 1 at 07:00 and 3 by 08:00, perfect for early risers. However, as the sun ascends, the intensity rises sharply, hitting a critical 10 by 10:00 and reaching its zenith at 12 by 11:00 and 13 by 12:00. The afternoon sees a gradual decline, with values dropping to 9 at 14:00, and then further sliding to 6 by 15:00. As evening approaches, the UV Index dwindles to 3 by 16:00, and finally tails off to 1 by 17:00, nurturing a calmer end to the day. With clear awareness of these fluctuations, individuals can effectively plan their outdoor activities, ensuring protection during the most intense 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	1	low	45 min
08:00	3	moderate	30 min
09:00	6	high	25 min
10:00	10	very high	15 min
11:00	12	extreme	10 min
12:00	13	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 Siem Reap

The seasonal UV changes reveal significant fluctuations, particularly from January to October, with the highest UV Index recorded in March at 15, and consistently high levels from February to October, primarily in the extreme category. The high-risk months for UV exposure are February through October, when the burn time is notably reduced to 10 minutes across these months. Visitors and residents should take precautionary measures during this time, such as wearing protective clothing, using broad-spectrum sunscreen, and seeking shade during peak hours to avoid harmful effects from UV radiation. In contrast, January and December present lower risks, with UV indices at 10 and burn times extending to 15 minutes, suggesting a slightly safer environment but still warranting caution.

Monthly Maximum UV Index for Siem Reap, Cambodia

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Siem Reap. 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 Siem Reap, 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 Siem Reap UV Index with Other Cambodia Cities

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

Siem Reap's solar exposure compared to other cities in Cambodia. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Battambang UVI	10	13	15	14	14	13	14	14	14	13	11	10
Siem Reap	10	13	15	14	14	13	14	14	14	12	11	10
Phnom Penh UVI	10	14	15	15	14	13	14	14	14	13	11	10
Takeo UVI	10	14	15	15	15	13	14	14	14	13	11	10
Sihanoukville UVI	11	14	15	15	14	13	14	14	14	13	11	11