Weather in St. Marys

Ontario, 325 m · continuously updated

–^°C

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Wind: –
Humidity: –
Rain ahead: –
Sunset: –

Temperature · last 4 and next 28 hours

St. Marys weather: the next 24 hours

Updated hourly.

St. Marys 14-day forecast

Two-week trend.

Rain radar

Sun and golden hours

Sunrise –, golden light until –

Sunset –, golden light from –

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Air quality

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European index, measured continuously.

UV index

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Daily maximum — protection advised from 3.

Freezing level

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Snow settles about 300 m below it.

Around St. Marys

Neighbouring towns, as the crow flies.

Stratford (Ontario)20 km Dorchester30 km London31 km Ingersoll31 km South Huron32 km Woodstock (Ontario)34 km New Hamburg38 km Huron East43 km

7-day forecast for St. Marys

Today (Thursday 15 Oct) in St. Marys: overcast, 9 to 12 °C, precipitation 0.0 mm (38 %), wind up to 24 km/h. Tomorrow: drizzle, 4 to 18 °C.

Day	Weather	Min	Max	Precip.	Wind
Today	overcast	9 °C	12 °C	0.0 mm	24 km/h
Tomorrow	drizzle	4 °C	18 °C	1.1 mm	35 km/h
Sat 17 Oct	overcast	0 °C	8 °C	0.0 mm	25 km/h
Sun 18 Oct	sunny	3 °C	15 °C	0.0 mm	29 km/h
Mon 19 Oct	overcast	6 °C	18 °C	0.0 mm	23 km/h
Tue 20 Oct	overcast	8 °C	16 °C	0.0 mm	13 km/h
Wed 21 Oct	overcast	6 °C	15 °C	0.0 mm	15 km/h

Forecast updated on 15.10.2026 at 11:44 (Open-Meteo model, elevation 325 m). The live block at the top of the page is refreshed hourly and covers 14 days.

Tomorrow's weather in St. Marys

Tomorrow, Friday 16 Oct, in St. Marys: drizzle, from 4 to 18 °C, 1.1 mm of precipitation (probability 67 %), wind up to 35 km/h.

Hour	Weather	Temp.	Precip.	Chance	Wind
00:00	overcast	10 °C	0.0 mm	54 %	23 km/h
03:00	fog	12 °C	0.0 mm	57 %	21 km/h
06:00	overcast	18 °C	0.0 mm	20 %	25 km/h
09:00	overcast	15 °C	0.0 mm	34 %	33 km/h
12:00	light drizzle	12 °C	0.4 mm	14 %	22 km/h
15:00	overcast	10 °C	0.0 mm	13 %	24 km/h
18:00	partly cloudy	7 °C	0.0 mm	3 %	25 km/h
21:00	partly cloudy	6 °C	0.0 mm	2 %	25 km/h

Frequently asked questions

Will it rain tomorrow in St. Marys?

Yes: 1.1 mm expected, probability 67 %.

How warm will it be tomorrow in St. Marys?

Between 4 and 18 °C.

The weekend

This weekend in St. Marys: Saturday overcast, 0 to 8 °C, Sunday sunny, 3 to 15 °C.

Day	Weather	Min	Max	Precip.	Wind
Sat 17 Oct	overcast	0 °C	8 °C	0.0 mm	25 km/h
Sun 18 Oct	sunny	3 °C	15 °C	0.0 mm	29 km/h

Hour by hour

The next 48 hours in St. Marys, hour by hour: temperature from 0 to 18 °C, 1.1 mm of rain expected.

Hour	Weather	Temp.	Precip.	Chance	Wind
11:00	overcast	10 °C	0.0 mm	0 %	19 km/h
12:00	overcast	10 °C	0.0 mm	0 %	19 km/h
13:00	overcast	11 °C	0.0 mm	0 %	18 km/h
14:00	overcast	11 °C	0.0 mm	0 %	15 km/h
15:00	overcast	12 °C	0.0 mm	1 %	18 km/h
16:00	overcast	11 °C	0.0 mm	1 %	16 km/h
17:00	overcast	11 °C	0.0 mm	3 %	17 km/h
18:00	overcast	11 °C	0.0 mm	5 %	15 km/h
19:00	overcast	10 °C	0.0 mm	9 %	18 km/h
20:00	overcast	10 °C	0.0 mm	20 %	20 km/h
21:00	overcast	10 °C	0.0 mm	37 %	23 km/h
22:00	overcast	10 °C	0.0 mm	38 %	23 km/h
23:00	overcast	10 °C	0.0 mm	37 %	24 km/h
00:00	overcast	10 °C	0.0 mm	54 %	23 km/h
01:00	overcast	10 °C	0.0 mm	56 %	19 km/h
02:00	drizzle	11 °C	0.7 mm	67 %	20 km/h
03:00	fog	12 °C	0.0 mm	57 %	21 km/h
04:00	fog	14 °C	0.0 mm	52 %	22 km/h
05:00	fog	17 °C	0.0 mm	25 %	28 km/h
06:00	overcast	18 °C	0.0 mm	20 %	25 km/h
07:00	overcast	18 °C	0.0 mm	31 %	30 km/h
08:00	overcast	17 °C	0.0 mm	30 %	35 km/h
09:00	overcast	15 °C	0.0 mm	34 %	33 km/h
10:00	overcast	14 °C	0.0 mm	29 %	30 km/h
11:00	overcast	14 °C	0.0 mm	13 %	30 km/h
12:00	light drizzle	12 °C	0.4 mm	14 %	22 km/h
13:00	overcast	10 °C	0.0 mm	12 %	25 km/h
14:00	overcast	10 °C	0.0 mm	10 %	25 km/h
15:00	overcast	10 °C	0.0 mm	13 %	24 km/h
16:00	overcast	9 °C	0.0 mm	16 %	25 km/h
17:00	overcast	8 °C	0.0 mm	9 %	28 km/h
18:00	partly cloudy	7 °C	0.0 mm	3 %	25 km/h
19:00	overcast	6 °C	0.0 mm	3 %	26 km/h
20:00	overcast	6 °C	0.0 mm	2 %	25 km/h
21:00	partly cloudy	6 °C	0.0 mm	2 %	25 km/h
22:00	overcast	5 °C	0.0 mm	2 %	31 km/h
23:00	mostly sunny	4 °C	0.0 mm	2 %	32 km/h
00:00	partly cloudy	3 °C	0.0 mm	2 %	25 km/h
01:00	partly cloudy	3 °C	0.0 mm	2 %	25 km/h
02:00	overcast	2 °C	0.0 mm	2 %	24 km/h
03:00	partly cloudy	2 °C	0.0 mm	0 %	17 km/h
04:00	sunny	2 °C	0.0 mm	0 %	20 km/h
05:00	sunny	1 °C	0.0 mm	0 %	23 km/h
06:00	overcast	0 °C	0.0 mm	0 %	23 km/h
07:00	mostly sunny	0 °C	0.0 mm	0 %	18 km/h
08:00	partly cloudy	0 °C	0.0 mm	0 %	16 km/h
09:00	sunny	1 °C	0.0 mm	0 %	16 km/h
10:00	sunny	3 °C	0.0 mm	0 %	18 km/h

Location of St. Marys

St. Marys lies at 325 m, 121 m above the average of the 187 places we cover in Ontario (204 m). That makes it the 23rd highest of the 187. The main town, Toronto, lies 149 km to the east. The nearest places we cover are Stratford, Ontario (20 km to the north-east), Dorchester (30 km to the south), London (31 km to the south) and Ingersoll (31 km to the south-east). With about 7,386 inhabitants according to GeoNames, St. Marys is the 163rd largest of the 187 places we cover in Ontario.