UV Index
UV Index
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Today's UV index in St. Catharines, Canada 
will be up to 1.5, indicating low risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
Today, the UV index suggests low sun danger (0-2) in St. Catharines, reaching up to 1.5. Remember sunglasses and SPF 30+ on sunny days, and be cautious around reflective surfaces like sand, water, and snow for increased UV exposure.
Read more here about the climate and sun exposure in and around St. Catharines.
St. Catharines, Canada experiences varying levels of UV (Ultraviolet) radiation throughout the year. During summer (June to August), the UV index can reach high levels, averaging around 7 (27). This indicates a moderate to high risk of sunburn, so it is important to protect your skin with sunscreen, hats, and sunglasses.
St. Catharines has four distinct seasons: spring (March to May), summer (June to August), fall (September to November), and winter (December to February). Spring brings cool temperatures, with highs of around 12-15 °C (54-59 °F) and occasional rain showers. Summer is warm and humid, with average highs of 26-29 °C (79-84 °F) and occasional thunderstorms. Fall brings cooler temperatures between 15-20 °C (59-68 °F), along with colorful foliage. Winter temperatures can drop below freezing, with average highs ranging from -2 to 2 °C (28-36 °F) and snowfall.
Compared to its region, St. Catharines enjoys a moderate climate due to its proximity to Lake Ontario. The lake acts as a natural moderator, keeping temperatures cooler in the summer and warmer in the winter compared to inland areas. However, the region still experiences sun exposure throughout the year, so it is important for residents and visitors to be mindful of UV levels and take appropriate precautions to protect their skin.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in St. Catharines. It's designed to provide you with a better understanding of the yearly weather and sun exposure.