Observed at: St. Catharines / Niagara District Airport
Date: 12:00 AM EDT Sunday 27 September 2026
Temp.: 10 °C
Wind: SSW 7 km/h
Humidity: 94 %
Dew point: 10 °C
Pressure: 101.8 kPa
Tendency: kPa
Visibility: km 		Sunrise: 7:10
Sunset: 19:06
Normals:
Max 19°C Min 10°C
 Extended Forecast - Environment Canada
  Sun, 27 Sep
Increasing cloudiness
Increasing cloudiness
Max: 20°C
 Mon, 28 Sep
Cloudy
Cloudy
Max: 19°C
 Tue, 29 Sep
A mix of sun and cloud
A mix of sun and cloud
Max: 22°C
 Wed, 30 Sep
Chance of showers (30%)
Chance of showers
Max: 22°C
 Thu, 1 Oct
Cloudy
Cloudy
Max: 22°C
 Fri, 2 Oct
Cloudy
Cloudy
Max: 21°C
Tonight
A few clouds
A few clouds
Min: 15°C
 Night
Chance of showers (30%)
Chance of showers
Min: 14°C
 Night
Cloudy
Cloudy
Min: 13°C
 Night
Clear
Clear
Min: 14°C
 Night
Cloudy
Cloudy
Min: 15°C
 Night
Chance of showers (30%)
Chance of showers
Min: 14°C

Forecast

St. Catharines, ON (Issued: 3:30 PM EDT Saturday 26 September 2026)

Tonight
Partly cloudy. Becoming clear this evening. Wind becoming northeast 20 km/h before morning. Low 15.
Sun, 27 Sep
Sunny. Increasing cloudiness early in the afternoon. Wind northeast 20 km/h gusting to 40. High 20. UV index 5 or moderate.
Night
Cloudy. 30 percent chance of showers overnight. Wind northeast 20 km/h gusting to 40. Low 14.
Mon, 28 Sep
Cloudy. High 19.
Night
Cloudy. Low 13.
Tue, 29 Sep
A mix of sun and cloud. High 22.
Night
Clear. Low 14.
Wed, 30 Sep
Cloudy with 30 percent chance of showers. High 22.
Night
Cloudy. Low 15.
Thu, 1 Oct
Cloudy. High 22.
Night
Cloudy with 30 percent chance of showers. Low 14.
Fri, 2 Oct
Cloudy. High 21.

24 Hour Forecast - St. Catharines, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
27 September 2026
1 AM 16 Clear (0%)  Clear 0 NE 15
2 AM 15 Clear (0%)  Clear 0 NE 15
3 AM 15 Clear (0%)  Clear 0 NE 15
4 AM 15 Clear (0%)  Clear 0 NE 15
5 AM 15 Clear (0%)  Clear 0 NE 20
6 AM 15 Clear (0%)  Clear 0 NE 20
7 AM 16 Sunny (0%)  Sunny 0 NE 20
8 AM 16 Sunny (0%)  Sunny 0 NE 20 gust 40
9 AM 17 Sunny (0%)  Sunny 0 NE 20 gust 40
10 AM 17 Sunny (0%)  Sunny 0 NE 20 gust 40
11 AM 18 Sunny (0%)  Sunny 0 N 20 gust 40
12 PM 19 Sunny (0%)  Sunny 0 N 20 gust 40
1 PM 19 Sunny (0%)  Sunny 0 N 20 gust 40
2 PM 20 Mainly cloudy (0%)  Mainly cloudy 0 NE 20
3 PM 20 Mainly cloudy (0%)  Mainly cloudy 0 NE 20
4 PM 20 Mainly cloudy (0%)  Mainly cloudy 0 NE 20
5 PM 20 Cloudy (0%)  Cloudy 0 E 20
6 PM 19 Cloudy (0%)  Cloudy 0 E 20
7 PM 18 Cloudy (0%)  Cloudy 0 E 20
8 PM 17 Cloudy (0%)  Cloudy 0 NE 20 gust 40
9 PM 17 Cloudy (0%)  Cloudy 0 NE 20 gust 40
10 PM 16 Cloudy (20%)  Cloudy 20 NE 20 gust 40
11 PM 16 Cloudy (20%)  Cloudy 20 NE 20
28 September 2026
12 AM 15 Chance of showers (30%)  Chance of showers 30 NE 20
 
† 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