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Sarnia UV Index Today

Day Summary

The UV index in Sarnia, Canada Flag of Canada will reach a high of 5.9 today. This means a moderate level of sun exposure. See our tips below to stay safe!

Last checked: 2025-08-25

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.

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

UV index

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.

Disclaimer

* The information on this page about the UV index in Sarnia is for educational purposes only. It is not a substitute for professional medical advice. Always consult a doctor for any health concerns.