Live Weather & Forecast
Weather in St. Clair
Ontario, Canada · Real-time conditions & 3-day outlook
9°C
Feels like 8°C
49°F / Feels 47°F
Mist
St. Clair, Ontario
🌞 Daytime
Updated: 2026-04-25 07:15
Humidity
87%
Wind
8.3 km/h NW
Wind Gust
12.4 km/h
Pressure
1009 mb
Visibility
2.4 km
UV Index
0
(Low)
Precipitation
0.03 mm
Cloud Cover
100%
Dew Point
8.8°C
Wind Degree
305°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
217.9 μg/m³
NO₂
10.3 μg/m³
O₃
67 μg/m³
SO₂
3 μg/m³
PM 2.5
10.1 μg/m³
PM 10
10.9 μg/m³
Today's Hourly Forecast
24-hour breakdown for St. Clair, Ontario
12 AM
10°
Patchy light drizzle
1 AM
10°
Light drizzle
2 AM
9°
Light drizzle
3 AM
9°
Light rain
4 AM
9°
Overcast
5 AM
9°
Mist
6 AM
9°
Mist
7 AM
9°
Mist
8 AM
10°
Fog
9 AM
10°
Patchy rain nearby
10 AM
10°
Patchy rain nearby
11 AM
10°
Overcast
12 PM
10°
Overcast
1 PM
10°
Patchy rain nearby
2 PM
9°
Overcast
3 PM
10°
Overcast
4 PM
10°
Overcast
5 PM
11°
Partly Cloudy
6 PM
11°
Overcast
7 PM
10°
Partly Cloudy
8 PM
8°
Partly Cloudy
9 PM
7°
Partly Cloudy
10 PM
7°
Partly Cloudy
11 PM
6°
Clear
3-Day Forecast
Daily overview for St. Clair, Ontario
Today
Patchy rain nearby
11°
/
6°
🌧️ 88% chance of rain
💧 Avg. humidity: 89%
💨 Max wind: 21.6 km/h
🌧️ Total precip: 2.26 mm
☀️ UV Index: 4.8
🌅 Sunrise: 06:33 AM
🌇 Sunset: 08:24 PM
🌙 Waxing Gibbous
🌑 Moon: 60% lit
Sun, Apr 26
Sunny
16°
/
5°
🌧️ 0% chance of rain
💧 Avg. humidity: 77%
💨 Max wind: 18 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 6.1
🌅 Sunrise: 06:31 AM
🌇 Sunset: 08:25 PM
🌙 Waxing Gibbous
🌑 Moon: 70% lit
Mon, Apr 27
Sunny
19°
/
7°
🌧️ 0% chance of rain
💧 Avg. humidity: 72%
💨 Max wind: 35.3 km/h
🌧️ Total precip: 0.04 mm
☀️ UV Index: 6.8
🌅 Sunrise: 06:30 AM
🌇 Sunset: 08:26 PM
🌙 Waxing Gibbous
🌑 Moon: 79% lit
Best Time to Visit St. Clair
Plan your trip to St. Clair, Canada around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in St. Clair?
Current conditions in St. Clair: Mist, temperature 9°C, humidity 87%.
What is the best time to visit St. Clair?
The best time to visit St. Clair is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in St. Clair?
St. Clair is located at approximately 42.8° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in St. Clair?
The wettest period in St. Clair is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to St. Clair?
For visits to St. Clair during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What are the public holidays in St. Clair in 2026?
View the 2026 public holidays for St. Clair on our Holidays page.
What are the GPS coordinates used for the weather forecast in St. Clair?
The weather forecast for St. Clair uses coordinates 42.7782, -82.3546.
What is the current temperature outside in St. Clair?
The current outdoor temperature in St. Clair is 9°C (48°F) with mist.
What is the hourly weather forecast for St. Clair today?
Today's hour-by-hour weather breakdown for St. Clair is shown in the Hourly Forecast section above, including temperature, rain chance, and conditions for each hour of the day.
What is the weather in St. Clair tomorrow hour by hour?
Tomorrow's forecast for St. Clair shows a high of 16°C and a low of 5°C. See the 3-Day Forecast section above for a full hourly breakdown.
What is the chance of rain today in St. Clair?
There is a 88% chance of rain in St. Clair today. Check the hourly forecast above for a time-by-time breakdown of when rain is most likely.
Is it going to rain today in St. Clair?
Yes, there is a 88% chance of rain in St. Clair today — consider carrying an umbrella. Check the hourly forecast above for the most likely rain windows.