UV Index in Siaya, Kenya

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Siaya, Kenya, where the tropical climate exposes individuals to significant UV radiation, particularly during midday hours. Monitoring UV levels is essential not only for preventing painful sunburns but also for promoting long-term skin health and minimizing the risk of skin cancer. With UV Index values peaking at 11 at noon and often exceeding 7 in the afternoon, Siaya's sunshine can pose serious risks to both locals and visitors if protective measures are not taken. Stay informed and protect your skin by paying attention to UV Index updates!

Hourly UV Index in Siaya

The UV Index throughout the day reveals a dynamic shift in sun strength. Starting off with a gentle maximum of 1 at both 07:00 and 08:00, the intensity begins to rise, reaching a moderate level of 3 by 09:00. As the clock strikes 10:00, the index leaps to 6, and by 11:00, it surges to 9, indicating increasing caution is needed. The day peaks at a scorching 11 at 12:00 and reaches its zenith with an astounding 12 at 13:00. A gradual decline follows, with levels dropping to 10 at 14:00, then 7 at 15:00, and finally settling back to 4 at 16:00. As the sun starts to set, the index plummets to 2 at 17:00, then quiets to 1 by 18:00, before dropping to 0 at 19:00. Be sure to take care during those peak 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	1	low	45 min
09:00	3	moderate	30 min
10:00	6	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Siaya

The UV Index data reveals a consistently extreme exposure category throughout the year, with only slight fluctuations in values. The high-risk months are centered from January to April, peaking at 16 in March, which indicates an urgent need for protective measures against harmful UV rays. Even during the summer months, such as June and July, the index remains alarmingly high, varying from 11 to 12. It is crucial for both visitors and residents to take precautions year-round, including wearing sunscreen, protective clothing, and seeking shade, especially during the peak hours of sun exposure. Given that the burn time remains alarmingly low at just 10 minutes across all months, vigilance is essential to prevent skin damage.

Monthly Maximum UV Index for Siaya, Kenya

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

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

Siaya's solar exposure compared to other cities in Kenya. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mombasa UVI	14	14	15	14	13	11	11	12	13	13	13	12
Siaya	14	15	16	15	13	11	12	12	13	13	12	12
Kikuyu UVI	15	16	16	16	13	11	11	13	14	14	13	13
Ruiru UVI	15	16	16	16	13	11	11	13	14	14	13	13
Nairobi UVI	15	16	16	16	13	11	11	13	14	14	13	13
Nakuru UVI	16	17	17	17	14	12	13	14	15	15	14	14