Forecast

5:17 p.m. EDT Thursday 12 March 2026

Very strong winds expected late Friday afternoon and evening.

What:
Westerly winds gusting 70 to 90 km/h.
Isolated utility outages possible.

When:
Friday afternoon and evening.

Additional information:
Strong southerly winds are expected to develop Friday morning with gusts up to 60 or 70 km/h possible. These winds are expected to further strengthen later in the afternoon or early evening and become more westerly with gusts of 70 to 90 km/h possible.

Winds are expected to ease later Friday night as the system responsible moves east of the region.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

In effect for:

St. Catharines - Grimsby - Northern Niagara Region

Extended Forecast - Environment Canada
	Fri, 13 Mar Chance of rain showers or flurries Max: 4°C	Sat, 14 Mar A mix of sun and cloud Max: 2°C	Sun, 15 Mar Chance of rain showers or flurries Max: 11°C	Mon, 16 Mar Showers Max: 15°C	Tue, 17 Mar Chance of flurries Max: -3°C	Wed, 18 Mar A mix of sun and cloud Max: -1°C
Tonight Chance of flurries Min: -5°C	Night Chance of flurries or rain showers Min: 0°C	Night Periods of snow Min: -2°C	Night Chance of showers Min: 9°C	Night Chance of flurries Min: -7°C	Night Cloudy periods Min: -9°C

St. Catharines, ON (Issued: 3:30 PM EDT Thursday 12 March 2026)

Tonight: Mainly cloudy with 30 percent chance of flurries early this evening. Clearing this evening. Wind west 30 km/h gusting to 50 becoming light early this evening. Low minus 5. Wind chill minus 9 overnight.
Fri, 13 Mar: Becoming cloudy in the morning then snow changing to 60 percent chance of rain showers or flurries near noon. Snowfall amount 2 to 4 cm. Wind becoming southeast 30 km/h gusting to 50 late in the morning. High plus 4. Wind chill minus 8 in the morning. UV index 2 or low.
Night: Cloudy. 60 percent chance of rain showers changing to 60 percent chance of flurries in the evening. Wind west 50 km/h gusting to 80. Low zero.
Sat, 14 Mar: A mix of sun and cloud. High plus 2.
Night: Periods of snow. Low minus 2.
Sun, 15 Mar: Cloudy with 60 percent chance of rain showers or flurries. High 11.
Night: Cloudy periods with 60 percent chance of showers. Low 9.
Mon, 16 Mar: Showers. Windy. High 15.
Night: Cloudy with 60 percent chance of flurries. Windy. Low minus 7.
Tue, 17 Mar: Cloudy with 60 percent chance of flurries. High minus 3.
Night: Cloudy periods. Low minus 9.
Wed, 18 Mar: A mix of sun and cloud. High minus 1.

24 Hour Forecast - St. Catharines, ON

Date/Time	Temp. (°C)	Weather Conditions	LOP †	Wind (km/h)
12 March 2026
8 PM	0	A few clouds	10	W 10
9 PM	0	A few clouds	10	W 10
10 PM	0	A few clouds	10	W 10
11 PM	0	A few clouds	10	W 10
13 March 2026
12 AM	-1	A few clouds	10	W 10
1 AM	-2	A few clouds	10	W 10
2 AM	-3	A few clouds	10	SE 10
3 AM	-4	A few clouds	20	SE 10
4 AM	-4	A few clouds	20	SE 10
5 AM	-5	Partly cloudy	20	SE 10
6 AM	-4	Partly cloudy	20	SE 10
7 AM	-4	Partly cloudy	20	SE 10
8 AM	-3	Snow	80	SE 10
9 AM	-1	Snow	80	SE 10
10 AM	1	Snow	80	SE 10
11 AM	3	Snow	80	SE 30
12 PM	3	Chance of rain showers or flurries	60	SE 30
1 PM	4	Chance of rain showers or flurries	60	SE 30
2 PM	4	Chance of rain showers or flurries	60	SE 30 gust 50
3 PM	4	Chance of rain showers or flurries	60	SE 30 gust 50
4 PM	4	Chance of showers	60	SE 30 gust 50
5 PM	4	Chance of showers	60	SE 30 gust 50
6 PM	4	Chance of showers	60	W 50 gust 80
7 PM	3	Chance of showers	60	W 50 gust 80

† Likelihood of Precipitation (LOP) as described in the public forecast as a chance of measurable precipitation for a period of time. Nil: 0% Low: 40% or below Medium: 60% or 70% High: Above 70%