Live Weather & Forecast
Weather in Saint Marys
Ontario, Canada · Real-time conditions & 3-day outlook
5°C
Feels like 1°C
41°F / Feels 34°F
Overcast
Saint Marys, Ontario
🌞 Daytime
Updated: 2026-04-25 07:30
Humidity
100%
Wind
20.2 km/h ENE
Wind Gust
27.5 km/h
Pressure
1009 mb
Visibility
16 km
UV Index
0
(Low)
Precipitation
1.03 mm
Cloud Cover
100%
Dew Point
4.1°C
Wind Degree
64°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
197.9 μg/m³
NO₂
9.5 μg/m³
O₃
66 μg/m³
SO₂
5 μg/m³
PM 2.5
9.4 μg/m³
PM 10
9.8 μg/m³
Today's Hourly Forecast
24-hour breakdown for Saint Marys, Ontario
12 AM
7°
Patchy rain nearby
1 AM
7°
Patchy rain nearby
2 AM
6°
Patchy rain nearby
3 AM
6°
Patchy rain nearby
4 AM
6°
Patchy rain nearby
5 AM
6°
Light drizzle
6 AM
6°
Light rain
7 AM
5°
Overcast
8 AM
6°
Light drizzle
9 AM
6°
Patchy rain nearby
10 AM
7°
Overcast
11 AM
7°
Overcast
12 PM
8°
Cloudy
1 PM
8°
Overcast
2 PM
8°
Overcast
3 PM
8°
Overcast
4 PM
9°
Overcast
5 PM
9°
Overcast
6 PM
10°
Partly Cloudy
7 PM
9°
Partly Cloudy
8 PM
7°
Sunny
9 PM
6°
Clear
10 PM
6°
Clear
11 PM
5°
Clear
3-Day Forecast
Daily overview for Saint Marys, Ontario
Today
Moderate rain
10°
/
5°
🌧️ 88% chance of rain
💧 Avg. humidity: 85%
💨 Max wind: 25.2 km/h
🌧️ Total precip: 6.77 mm
☀️ UV Index: 3.6
🌅 Sunrise: 06:27 AM
🌇 Sunset: 08:19 PM
🌙 Waxing Gibbous
🌑 Moon: 60% lit
Sun, Apr 26
Partly Cloudy
15°
/
3°
🌧️ 0% chance of rain
💧 Avg. humidity: 77%
💨 Max wind: 19.4 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 6.4
🌅 Sunrise: 06:25 AM
🌇 Sunset: 08:20 PM
🌙 Waxing Gibbous
🌑 Moon: 70% lit
Mon, Apr 27
Sunny
19°
/
6°
🌧️ 0% chance of rain
💧 Avg. humidity: 68%
💨 Max wind: 33.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 6.5
🌅 Sunrise: 06:24 AM
🌇 Sunset: 08:21 PM
🌙 Waxing Gibbous
🌑 Moon: 79% lit
Best Time to Visit Saint Marys
Plan your trip to Saint Marys, 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 Saint Marys?
Current conditions in Saint Marys: Overcast, temperature 5°C, humidity 100%.
What is the best time to visit Saint Marys?
The best time to visit Saint Marys is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Saint Marys?
Saint Marys is located at approximately 43.3° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Saint Marys?
The wettest period in Saint Marys is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Saint Marys?
For visits to Saint Marys during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What are the public holidays in Saint Marys in 2026?
View the 2026 public holidays for Saint Marys on our Holidays page.
What are the GPS coordinates used for the weather forecast in Saint Marys?
The weather forecast for Saint Marys uses coordinates 43.2595, -81.1422.
What is the current temperature outside in Saint Marys?
The current outdoor temperature in Saint Marys is 5°C (41°F) with overcast.
What is the hourly weather forecast for Saint Marys today?
Today's hour-by-hour weather breakdown for Saint Marys 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 Saint Marys tomorrow hour by hour?
Tomorrow's forecast for Saint Marys shows a high of 15°C and a low of 3°C. See the 3-Day Forecast section above for a full hourly breakdown.
What is the chance of rain today in Saint Marys?
There is a 88% chance of rain in Saint Marys 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 Saint Marys?
Yes, there is a 88% chance of rain in Saint Marys today — consider carrying an umbrella. Check the hourly forecast above for the most likely rain windows.