UV Index in London, Canada

Last updated: July 2, 2025

In London, Canada, staying informed about the UV Index is essential for protecting your skin and overall health. Understanding UV levels not only helps in preventing sunburn but also plays a crucial role in long-term skin protection, reducing the risk of skin cancers and premature aging. With a Dfb climate, London experiences varied conditions, but during the summer months, UV exposure can peak dramatically, reaching levels as high as 10 at midday. Being aware of these fluctuations allows you to enjoy the sun safely, ensuring your outings are both fun and healthy.

Hourly UV Index in London

The UV Index data illustrates a dynamic shift throughout the day, peaking in the afternoon hours. Starting at a mild 1 at 7 AM and 8 AM, the index climbs steadily, reaching a distinctive 3 by 9 AM. By 11 AM, it surges to 7, and the intensity escalates further with a peak of 10 at 1 PM—making it the most critical time for sun exposure. As the afternoon progresses, the index gradually declines, settling at 6 by 4 PM and tapering off to 1 by 7 PM. This data serves as a crucial reminder to take sunscreen precautions especially between 11 AM and 2 PM, when the sun’s rays are the 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	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 min
12:00	8	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 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