UV Index in Ratnapura, Sri Lanka

Last updated: August 1, 2025

In Ratnapura, Sri Lanka, understanding the UV Index is crucial for protecting your skin and overall health. With its tropical climate and a significant daily sun exposure, the UV levels can peak as high as 13 around noon, posing serious risks for sunburn and long-term skin damage. By staying informed about the UV Index—especially during the most intense hours—residents and visitors can take appropriate precautions to enjoy the beautiful outdoors while safeguarding their skin health. Whether you're exploring the lush landscapes or engaging in daily activities, being aware of UV levels can make all the difference in preventing harmful effects from the sun.

Hourly UV Index in Ratnapura

The UV Index fluctuated dramatically throughout the day, showcasing the sun's intensity. Starting mild at 07:00 with a rating of 2, it quickly ascended, peaking at a blistering 13 around 11:00 and 12:00. This midday surge emphasized the importance of sun protection. As the sun began to descend, the UV levels dropped sharply, tapering off to a 5 by 15:00, and dwindling further to 0 by 19:00. This pattern highlights the critical window for UV exposure from 09:00 to 14:00, where caution and protection are paramount to safeguard against harmful rays.

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	12	extreme	10 min
11:00	14	extreme	10 min
12:00	14	extreme	10 min
13:00	12	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 Ratnapura

The UV Index exhibits consistently extreme levels throughout the year, with particularly high numbers from February to May, peaking in March and April at 15. Visitors and residents should be especially vigilant during these high-risk months, as the burn time is just 10 minutes regardless of the month. Despite a slight decline in the UV Index during the summer and fall, the exposure remains notably high, ranging from 12 to 14. It is essential for everyone to take precautionary measures year-round, including wearing sunscreen, protective clothing, and sunglasses, to minimize the risk of UV-related health issues.

Monthly Maximum UV Index for Ratnapura, Sri Lanka

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Ratnapura. 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 Ratnapura, 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 Ratnapura UV Index with Other Sri Lanka Cities

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

Ratnapura's solar exposure compared to other cities in Sri Lanka. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Jaffna UVI	11	13	14	15	13	12	13	13	14	12	11	10
Moratuwa UVI	11	13	14	15	14	12	13	14	14	13	11	10
Maharagama UVI	11	13	14	15	14	12	13	14	14	13	11	10
Dehiwala-Mount Lavinia UVI	12	13	14	15	14	12	13	14	14	13	11	10
Colombo UVI	12	14	14	15	14	13	13	13	14	13	11	10
Ratnapura	12	14	15	15	15	13	13	14	14	13	12	11