UV Index
UV Index
Today's UV index in London, Canada 
will be up to 9.4, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-22
With a UV index of 9.4 in London, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
The UV index in London, Canada, typically ranges from low in winter to moderate or high in summer, peaking around 6 to 7 during sunny days in June and July.
London experiences cold winters with snow, mild springs, warm summers, and cool autumns. The warmest months are July and August, while January is usually the coldest, often below freezing.
Compared to other Canadian cities, London has moderate weather, less harsh than northern areas. It is warmer than cities like Toronto in winter but cooler than southern US cities. Neighboring countries like the US often have higher summer UV levels.
See the UV index hour by hour for London, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.