UV Index
UV Index
Today's UV index in Saint Catharines, Canada 
will be up to 8.1, 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: 2025-06-20
With a UV index of 8.1 in Saint Catharines, 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 Saint Catharines varies throughout the year, typically higher in summer months, reaching levels around 6 to 8, indicating moderate to high ultraviolet radiation. In winter, the UV index often drops below 2, showing low exposure.
Saint Catharines experiences four distinct seasons: cold snowy winters, warm and humid summers, mild springs, and cool autumns. Summers can be hot with temperatures often above 25°C, while winters frequently dip below freezing, bringing snow and ice.
Compared to other parts of Canada, Saint Catharines generally has milder winters due to its location near the Great Lakes. It is warmer and less snowy than northern regions but experiences cooler temperatures than southern U.S. cities. Its climate is similar to nearby cities like Toronto and Hamilton.
See the UV index hour by hour for Saint Catharines, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.