Observed at: St. Catharines / Niagara District Airport
Date: 5:00 PM EDT Friday 7 August 2026
Mostly Cloudy
Mostly Cloudy 		Temp.: 26 °C
Wind: N 3 km/h
Humidity: 78 %
Dew point: 21 °C
Pressure: 101.7 kPa
Tendency: 0.23 kPa
Visibility: 24 km 		Sunrise: 6:13
Sunset: 20:31
Normals:
Max 26°C Min 17°C
 Extended Forecast - Environment Canada
  Sat, 8 Aug
Chance of showers (70%)
Chance of showers
Max: 28°C
 Sun, 9 Aug
Sunny
Sunny
Max: 27°C
 Mon, 10 Aug
Chance of showers (60%)
Chance of showers
Max: 27°C
 Tue, 11 Aug
Chance of showers (40%)
Chance of showers
Max: 25°C
 Wed, 12 Aug
A mix of sun and cloud
A mix of sun and cloud
Max: 25°C
 Thu, 13 Aug
A mix of sun and cloud
A mix of sun and cloud
Max: 25°C
Tonight
Chance of showers (40%)
Chance of showers
Min: 20°C
 Night
Chance of showers (70%)
Chance of showers
Min: 19°C
 Night
Chance of showers (40%)
Chance of showers
Min: 20°C
 Night
Chance of showers (60%)
Chance of showers
Min: 19°C
 Night
Chance of showers (30%)
Chance of showers
Min: 18°C
 Night
Cloudy periods
Cloudy periods
Min: 16°C

Forecast

St. Catharines, ON (Issued: 3:30 PM EDT Friday 7 August 2026)

Tonight
Partly cloudy. 40 percent chance of showers early this evening. 30 percent chance of showers before morning. Risk of a thunderstorm. Fog patches developing overnight. Low 20.
Sat, 8 Aug
A mix of sun and cloud. 30 percent chance of showers changing to 70 percent chance of showers in the afternoon. Risk of a thunderstorm in the morning and afternoon. Fog patches dissipating in the morning. Wind becoming southwest 30 km/h gusting to 50 in the morning. High 28. Humidex 37. UV index 8 or very high.
Night
Partly cloudy with 70 percent chance of showers in the evening and risk of a thunderstorm. Clearing overnight. Wind north 30 km/h gusting to 50 becoming light in the evening. Wind becoming northwest 20 before morning. Low 19.
Sun, 9 Aug
Sunny. High 27.
Night
Cloudy periods with 40 percent chance of showers. Low 20.
Mon, 10 Aug
Cloudy with 60 percent chance of showers. High 27.
Night
Cloudy periods with 60 percent chance of showers. Low 19.
Tue, 11 Aug
Cloudy with 40 percent chance of showers. High 25.
Night
Cloudy with 30 percent chance of showers. Low 18.
Wed, 12 Aug
A mix of sun and cloud. High 25.
Night
Cloudy periods. Low 16.
Thu, 13 Aug
A mix of sun and cloud. High 25.

24 Hour Forecast - St. Catharines, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
7 August 2026
6 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 VR 5
7 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 VR 5
8 PM 22 A mix of sun and cloud (20%)  A mix of sun and cloud 20 VR 5
9 PM 22 Partly cloudy (20%)  Partly cloudy 20 VR 5
10 PM 21 Partly cloudy (20%)  Partly cloudy 20 VR 5
11 PM 21 A few clouds (20%)  A few clouds 20 SW 10
8 August 2026
12 AM 21 A few clouds (20%)  A few clouds 20 SW 10
1 AM 20 A few clouds (20%)  A few clouds 20 SW 10
2 AM 20 Partly cloudy (20%)  Partly cloudy 20 VR 5
3 AM 20 Partly cloudy (20%)  Partly cloudy 20 VR 5
4 AM 20 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 VR 5
5 AM 20 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 10
6 AM 21 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 10
7 AM 21 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 10
8 AM 22 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20
9 AM 23 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20
10 AM 24 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20
11 AM 25 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20 gust 40
12 PM 26 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20 gust 40
1 PM 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 20 gust 40
2 PM 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 30 gust 50
3 PM 27 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 30 gust 50
4 PM 26 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 30 gust 50
5 PM 25 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 N 30 gust 50
 
† 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