UV Index
UV Index
Today's UV index in Waterloo, Canada 
will be up to 8.9, 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: 2025-06-14
With a UV index of 8.9 in Waterloo, 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.
Waterloo, Canada, has a UV index that varies throughout the year. It is lowest in winter, often between 0 and 1, and highest in summer, reaching around 6 to 7 during sunny days.
The weather in Waterloo changes with the seasons. Winters are cold and snowy, with temperatures often below freezing. Summers are warm and sometimes humid, while spring and fall are mild with occasional rain.
Compared to other parts of Ontario and nearby regions, Waterloo experiences similar seasonal weather but slightly colder winters than southern cities like Toronto. Neighboring areas such as Kitchener share almost identical weather patterns.
See the UV index hour by hour for Waterloo, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.