UV Index in Horana South, Sri Lanka

Last updated: July 2, 2025

Understanding the UV Index in Horana South, Sri Lanka is crucial for safeguarding your skin and overall health. With a climate that often presents elevated UV levels, being aware of these fluctuations—such as the peak index reaching 13 around noon—helps in preventing sunburn and long-term skin damage. As UV exposure can vary significantly throughout the day, diligent monitoring allows residents and visitors to enjoy the sun while effectively protecting themselves against its risks. Staying informed about the UV Index not only promotes awareness but also empowers everyone to make healthier choices during their time outdoors.

Hourly UV Index in Horana South

The UV Index displays a stark increase throughout the morning, starting with a manageable 2 at 07:00, climbing to a moderate 4 by 08:00. As the sun climbs higher, the index peaks at 13 between 12:00 and 13:00, indicating strong UV radiation and the need for protection. Following this midday intensity, the numbers begin to decline, dipping to 8 at 14:00, and later dropping to a safe 2 by 16:00. By evening, UV exposure diminishes to 0 by 19:00, signaling an end to the day’s sunniest moments. Be mindful of this hourly fluctuation, especially during peak hours, to protect your skin!

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	8	very high	15 min
15:00	4	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 Horana South

The UV Index shows significant seasonal fluctuations, peaking in the spring and summer months, specifically from February to September when the index ranges from 13 to 15, indicating an extreme exposure category. Notably, March and April are the months with the highest measurements, making them particularly high-risk for sunburn, with a burn time of only 10 minutes. As summer transitions to fall, the UV levels remain high until October, gradually decreasing to a very high index of 10 by December, which increases the permissible burn time to 15 minutes. To protect yourself during the high-risk months, it is crucial for visitors and residents to wear sunscreen, seek shade, and limit sun exposure, especially between the hours of 10 AM and 4 PM when the sun's rays are strongest.

Monthly Maximum UV Index for Horana South, Sri Lanka

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

The table above highlights how UV exposure in Horana South 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.

Horana South'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
Horana South	11	13	14	15	14	12	13	14	14	13	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