Sarnia UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index6.1
- Avg Clouds16%
- Max Temp23.9 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in Sarnia, Canada 
will reach a high of 6.1 today. This means a high level of sun exposure. See our tips below to stay safe!
Last checked: 2025-09-15
Hourly Forecast Chart
Today's Safety Tips
Be careful! The sun's rays are strong. Try to stay in the shade between 10 a.m. and 4 p.m. Wear a hat, sunglasses, and reapply SPF 30+ sunscreen every 2 hours.
Sarnia's UV Index
The UV index in Sarnia, Canada, typically ranges from low to moderate during most of the year, with higher values in late spring and summer months, reaching levels that can occasionally be high on sunny days.
Weather Seasons
Sarnia experiences four distinct seasons: cold, snowy winters; warm, humid summers; mild springs with increasing sunshine; and cool, colorful autumns. Winter lasts from December to February, while summer spans June through August.
Sarnia's Climate
Compared to nearby cities in Ontario and Michigan across the border, Sarnia has similar weather patterns but tends to be slightly cooler in winter. Its location near Lake Huron influences humidity and moderates temperature extremes more than places further inland.
Hourly UV Index Trend
See the UV index hour by hour for Sarnia. When the level is high, it's smart to find some shade.
- Loading hourly data...