Observed at: St. Catharines / Niagara District Airport
Date: 12:00 AM EDT Monday 17 March 2025
Temp.: 5 °C
Wind: WNW 21 km/h
Humidity: 78 %
Dew point: 1 °C
Pressure: 101.0 kPa
Tendency: kPa
Visibility: km 		Sunrise: 7:26
Sunset: 19:26
Normals:
Max 5°C Min -3°C
 Extended Forecast - Environment Canada
  Mon, 17 Mar
Clearing
Clearing
Max: 4°C
 Tue, 18 Mar
Sunny
Sunny
Max: 9°C
 Wed, 19 Mar
A mix of sun and cloud
A mix of sun and cloud
Max: 13°C
 Thu, 20 Mar
Chance of showers (60%)
Chance of showers
Max: 7°C
 Fri, 21 Mar
A mix of sun and cloud
A mix of sun and cloud
Max: 3°C
 Sat, 22 Mar
A mix of sun and cloud
A mix of sun and cloud
Max: 5°C
Tonight
Chance of showers (40%)
Chance of showers
Min: -1°C
 Night
Clear
Clear
Min: -3°C
 Night
Cloudy periods
Cloudy periods
Min: 5°C
 Night
Chance of showers (40%)
Chance of showers
Min: 6°C
 Night
Chance of flurries (60%)
Chance of flurries
Min: -4°C
 Night
Cloudy periods
Cloudy periods
Min: -2°C

Forecast

St. Catharines, ON (Issued: 3:30 PM EDT Sunday 16 March 2025)

Tonight
Mainly cloudy. 40 percent chance of showers this evening. Wind southwest 40 km/h gusting to 70 becoming west 20 this evening then light late this evening. Low minus 1.
Mon, 17 Mar
Clearing. Wind becoming north 20 km/h late in the morning. High plus 4. UV index 4 or moderate.
Night
Clear. Wind up to 15 km/h. Low minus 3. Wind chill minus 7 overnight.
Tue, 18 Mar
Sunny. High 9.
Night
Cloudy periods. Low plus 5.
Wed, 19 Mar
A mix of sun and cloud. High 13.
Night
Cloudy with 40 percent chance of showers. Low 6.
Thu, 20 Mar
Cloudy with 60 percent chance of showers. High 7.
Night
Cloudy periods with 60 percent chance of flurries. Low minus 4.
Fri, 21 Mar
A mix of sun and cloud. High plus 3.
Night
Cloudy periods. Low minus 2.
Sat, 22 Mar
A mix of sun and cloud. High plus 5.

24 Hour Forecast - St. Catharines, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
17 March 2025
1 AM 4 Cloudy (20%)  Cloudy 20 W 15
2 AM 3 Cloudy (20%)  Cloudy 20 W 15
3 AM 2 Cloudy (20%)  Cloudy 20 W 15
4 AM 2 Cloudy (20%)  Cloudy 20 W 15
5 AM 1 Cloudy (20%)  Cloudy 20 W 15
6 AM 0 Cloudy (20%)  Cloudy 20 NW 15
7 AM 0 Cloudy (20%)  Cloudy 20 NW 15
8 AM -1 Cloudy (20%)  Cloudy 20 NW 15
9 AM -1 Cloudy (20%)  Cloudy 20 NW 15
10 AM 0 Mainly cloudy (20%)  Mainly cloudy 20 NW 15
11 AM 0 A mix of sun and cloud (20%)  A mix of sun and cloud 20 N 20
12 PM 1 A mix of sun and cloud (10%)  A mix of sun and cloud 10 N 20
1 PM 1 Mainly sunny (10%)  Mainly sunny 10 N 20
2 PM 2 Sunny (10%)  Sunny 10 NW 10
3 PM 3 Sunny (10%)  Sunny 10 NW 10
4 PM 3 Sunny (10%)  Sunny 10 NW 10
5 PM 4 Sunny (10%)  Sunny 10 NW 10
6 PM 3 Sunny (0%)  Sunny 0 NW 10
7 PM 2 Clear (0%)  Clear 0 NW 10
8 PM 1 Clear (0%)  Clear 0 S 10
9 PM 1 Clear (0%)  Clear 0 S 10
10 PM 0 Clear (0%)  Clear 0 S 10
11 PM 0 Clear (0%)  Clear 0 S 10
18 March 2025
12 AM -1 Clear (0%)  Clear 0 S 10
 
† 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%

Environment Canada