Observed at: St. Catharines / Niagara District Airport
Date: 11:00 PM EST Sunday 21 December 2025
Temp.: -4 °C
Wind Chill: -11 °C
Wind: WSW 23 gust 33 km/h
Humidity: 65 %
Dew point: -10 °C
Pressure: 103.2 kPa
Tendency: kPa
Visibility: km 		Sunrise: 7:46
Sunset: 16:45
Normals:
Max 1°C Min -6°C
 Extended Forecast - Environment Canada
  Mon, 22 Dec
Mainly cloudy
Mainly cloudy
Max: 4°C
 Tue, 23 Dec
Periods of drizzle (60%)
Periods of drizzle
Max: 5°C
 Wed, 24 Dec
Sunny
Sunny
Max: 2°C
 Thu, 25 Dec
Chance of showers (40%)
Chance of showers
Max: 5°C
 Fri, 26 Dec
Chance of showers (30%)
Chance of showers
Max: 4°C
 Sat, 27 Dec
Chance of flurries or rain showers (30%)
Chance of flurries or rain showers
Max: 1°C
Tonight
Partly cloudy
Partly cloudy
Min: -8°C
 Night
Chance of flurries (40%)
Chance of flurries
Min: 1°C
 Night
Cloudy periods
Cloudy periods
Min: -4°C
 Night
Cloudy
Cloudy
Min: 1°C
 Night
Chance of showers (40%)
Chance of showers
Min: 4°C
 Night
Chance of flurries or rain showers (30%)
Chance of flurries or rain showers
Min: 0°C

Forecast

St. Catharines, ON (Issued: 6:11 PM EST Sunday 21 December 2025)

Tonight
Cloudy. Becoming partly cloudy late this evening. Wind west 30 km/h gusting to 50 becoming light after midnight. Low minus 8. Wind chill near minus 13.
Mon, 22 Dec
A mix of sun and cloud. Becoming cloudy in the afternoon. Wind becoming southwest 20 km/h gusting to 40 in the morning. High plus 4. Wind chill minus 10 in the morning.
Night
Cloudy with 40 percent chance of flurries in the evening and after midnight. Periods of rain or drizzle beginning after midnight. Risk of freezing drizzle over higher terrain overnight. Wind south 20 km/h. Low plus 1.
Tue, 23 Dec
Cloudy with 60 percent chance of drizzle. High plus 5.
Night
Clearing. Windy. Low minus 4.
Wed, 24 Dec
Sunny. High plus 2.
Night
Cloudy. Low plus 1.
Thu, 25 Dec
Cloudy with 40 percent chance of showers. High plus 5.
Night
Cloudy with 40 percent chance of showers. Low plus 4.
Fri, 26 Dec
Cloudy with 30 percent chance of showers. High plus 4.
Night
Cloudy with 30 percent chance of flurries or rain showers. Low zero.
Sat, 27 Dec
Cloudy with 30 percent chance of flurries or rain showers. High plus 1.

24 Hour Forecast - St. Catharines, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
22 December 2025
12 AM -5 Partly cloudy (20%)  Partly cloudy 20 SW 20
1 AM -6 Partly cloudy (20%)  Partly cloudy 20 SW 10
2 AM -7 Partly cloudy (20%)  Partly cloudy 20 SW 10
3 AM -7 Partly cloudy (20%)  Partly cloudy 20 SW 10
4 AM -8 A few clouds (20%)  A few clouds 20 SW 10
5 AM -7 Clear (20%)  Clear 20 SW 10
6 AM -6 A few clouds (20%)  A few clouds 20 SW 10
7 AM -5 Partly cloudy (20%)  Partly cloudy 20 SW 10
8 AM -4 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
9 AM -2 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
10 AM -1 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 20 gust 40
11 AM 1 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 20 gust 40
12 PM 2 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 20 gust 40
1 PM 4 Mainly cloudy (20%)  Mainly cloudy 20 SW 20 gust 40
2 PM 4 Cloudy (20%)  Cloudy 20 SW 20 gust 40
3 PM 3 Cloudy (20%)  Cloudy 20 SW 20 gust 40
4 PM 3 Cloudy (20%)  Cloudy 20 S 20
5 PM 3 Cloudy (20%)  Cloudy 20 S 20
6 PM 2 Chance of flurries (40%)  Chance of flurries 40 S 20
7 PM 2 Chance of flurries (40%)  Chance of flurries 40 S 20
8 PM 2 Chance of flurries (40%)  Chance of flurries 40 S 20
9 PM 2 Chance of flurries (40%)  Chance of flurries 40 S 20
10 PM 2 Chance of flurries (40%)  Chance of flurries 40 SE 10
11 PM 2 Chance of flurries (40%)  Chance of flurries 40 SE 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