Area Conditions for St Marys, ON
 
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Temperature: 18 oC
Feels Like: 18 oC
Humidity: 87%
Barometer: 29.65
Dew Point: 16 oC
Wind Dir.: S
Wind Speed: 19 km/h
Sunrise: 7:43
Sunset: 6:35
Observation: Thunderstorms
As reported at HPSTS St Mary's, ON at 2:00 AM

5-day Forecast for St Marys, ON
Date Sun
19 Oct
Mon
20 Oct
Tue
21 Oct
Wed
22 Oct
Thu
23 Oct
Weather Condition Thunder Storms Rain Thunder Storms Rain Rain
Weather Thunder Storms Rain Thunder Storms Rain Rain
Temperature (°C)
Low/High
9/19 6/13 6/14 4/10 4/9
Feels Like (°C)
Low/High
6/19 4/13 3/14 1/10 0/7
Dew Point (°C) 13 6 6 4 4
Humidity (%) 87 65 73 83 83
Wind Speed (kph) 27 18 21 21 19
Precipitation
Chance
(%)
80 57 80 80 80
Precipitation
Amount
(cm)
S=Snow, L=Liquid
Rain
1.73
Rain
0.13
Rain
0.58
Rain
0.94
Rain
0.74
Evapo-
transpiration

(cm/day)
0.15 0.23 0.2 0.13 0.13
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DTN Weather Summary

Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Strong Front Bringing Areas of Heavy Rain, Severe Weather This Weekend
Posted at 11:54AM Fri Oct 17, 2025 CDT
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