UV Index in London, Canada

Last updated: June 2, 2025

Understanding the UV Index in London, Canada is crucial for safeguarding your skin and overall health against the sun’s harmful rays. With UV levels peaking at a maximum of 10 around midday, it’s essential to be aware of these numbers to prevent sunburn and long-term skin damage during sunny days. As a city in a Dfb climate zone, London experiences distinct seasons, bringing varying UV exposure risks throughout the year. By tracking the UV Index, residents can better protect themselves and enjoy the sun responsibly.

Hourly UV Index in London

The UV Index for today showcases a dynamic range of intensity, peaking at 10 between 1 PM and 2 PM. As the sun rises, 07:00 greets us with a gentle 1, escalating to a moderate 3 by 09:00. By mid-morning, the heat intensifies, climbing to 5 at 10:00 and hitting a significant 7 at 11:00. The critical hours arrive at noon, where we reach 9, ultimately culminating in the afternoon peak of 10 at 13:00 and 14:00. As the day progresses, the intensity gradually recedes, dropping to 7 at 16:00, and winding down to 3 by 18:00 and settling back to a safe 1 by 19:00. It’s essential to stay protected during the peak hours when the sun is at its strongest!

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	2	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in London

Throughout the year, UV exposure fluctuates significantly. January sees a low UV Index of 2, while by February and March, it rises to 4 and 5, indicating moderate exposure and a burn time of 30 minutes. As spring progresses into April, the UV Index sharply increases to 8, categorized as very high, marking the beginning of high-risk months, which continue through May, June, July, and August with UV Index values reaching a peak of 10. Visitors and residents should take particular caution during these summer months, as burn time drops to just 15 minutes under peak conditions. September maintains a high risk with an 8 index, while the UV Index drops back to moderate levels in October (5) and November (4) before returning to low levels in December (2). To minimize the risk of UV exposure, it is essential for individuals to wear sunscreen, protective clothing, and seek shade, especially from late spring through early fall.

Monthly Maximum UV Index for London, Canada

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

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

London's solar exposure compared to other cities in Canada. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Edmonton UVI	2	3	5	6	7	7	8	7	6	4	2	1
Calgary UVI	2	3	4	6	8	8	9	8	7	4	2	1
Montreal UVI	2	4	5	7	9	9	8	8	7	5	3	2
Ottawa UVI	2	4	5	8	9	9	8	8	7	5	3	2
Toronto UVI	2	4	5	8	9	9	9	9	7	5	3	2
London	2	4	5	8	9	10	10	9	8	5	4	2