UV Index
St. Catharines UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index5.3
- Avg Clouds18%
- Max Temp26.7 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in St. Catharines, Canada 
will reach a high of 5.3 today. This means a moderate level of sun exposure. See our tips below to stay safe!
Last checked: 2025-09-18
Hourly Forecast Chart
Today's Safety Tips
The sun is a bit strong. Find some shade during midday. Wear a hat, sunglasses, and use SPF 30+ sunscreen if you'll be outside for a while.
St. Catharines's UV Index
St. Catharines has a UV index that varies throughout the year, reaching its highest levels of around 7 to 8 during summer months and dropping to 1 or 2 in winter. The city sees warmer, sunnier conditions in summer and cold, snowy weather in winter. Spring and fall have mild temperatures and moderate rainfall, with transitions between the two extremes. Compared to nearby cities like Toronto, St. Catharines tends to have slightly milder winters and warmer summers due to its proximity to Lake Ontario. In the wider Great Lakes region, it shares similar seasonal patterns but often experiences more lake-effect snow than areas farther from water.
Hourly UV Index Trend
See the UV index hour by hour for St. Catharines. When the level is high, it's smart to find some shade.
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