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	Area Conditions for St Marys, ON

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As reported at HPSTS St Mary's, ON at 3:00 AM

	5-day Forecast for St Marys, ON

Date	Wed 17 Jun	Thu 18 Jun	Fri 19 Jun	Sat 20 Jun	Sun 21 Jun
Weather Condition
Weather	Thunder Storms	Thunder Storms	Thunder Storms	Mostly Cloudy	Rain
Temperature (°C) Low/High	12/21	15/19	12/21	10/21	10/21
Feels Like (°C) Low/High	12/21	15/19	12/21	10/21	10/21
Dew Point (°C)	12	14	10	8	9
Humidity (%)	66	74	61	55	57
Wind Speed (kph)	18	27	23	21	11
Precipitation Chance (%)	80	80	48	-	71
Precipitation Amount (cm) S=Snow, L=Liquid	Rain 0.84	Rain 1.85	Rain 0.15	None	Rain 0.36
Evapo- transpiration (cm/day)	0.38	0.33	0.46	0.48	0.38

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DTN Weather Summary

Bryce Anderson – DTN Meteorologist

Three active weather systems; severe outbreak Wednesday threatens tornadoes, damaging winds, and large hail Midwest. » More DTN Weather Commentary

Posted at 12:00PM Tue Jun 16, 2026 CDT

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