UV Index
UV Index
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Today's UV index in London, Canada 
will be up to 5.3, indicating a moderate level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 5.3 in London, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
The UV index in London, Canada can reach high levels during the summer months, with a maximum index of 9. In the winter, the UV index is much lower, usually staying below 2.
London, Canada experiences four distinct seasons: spring, summer, autumn, and winter. Summer temperatures can reach up to 30°C, while winter temperatures can drop below -10°C. Spring and autumn are transitional seasons with mild temperatures and changing foliage.
Compared to its region and neighboring countries, London's weather is relatively mild. It is warmer than many parts of Canada during the winter, but cooler than neighboring United States during the summer. The area receives a moderate amount of precipitation throughout the year, with spring and winter being the wettest seasons.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in London. It's designed to provide you with a better understanding of the yearly weather and sun exposure.