Observed at: St. Catharines / Niagara District Airport
Date: 11:00 AM EDT Friday 7 August 2026
Mist
Mist 		Temp.: 23 °C
Wind: SSW 10 km/h
Humidity: 92 %
Dew point: 22 °C
Pressure: 102.0 kPa
Tendency: 0.05 kPa
Visibility: 5 km 		Sunrise: 6:13
Sunset: 20:31
Normals:
Max 26°C Min 17°C
 Extended Forecast - Environment Canada
Today
Chance of showers (40%)
Chance of showers
Max: 23°C
 Sat, 8 Aug
Chance of showers (60%)
Chance of showers
Max: 27°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 (40%)
Chance of showers
Min: 18°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: 11:00 AM EDT Friday 7 August 2026)

Today
Showers ending near noon then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm this afternoon. High 23. Humidex 31. UV index 7 or high.
Tonight
Partly cloudy. 40 percent chance of showers this evening with risk of a thunderstorm. Fog patches developing overnight. Low 20.
Sat, 8 Aug
A mix of sun and cloud with 60 percent chance of showers and risk of a thunderstorm. Fog patches dissipating in the morning. Wind becoming southwest 20 km/h in the morning. High 27. Humidex 35. UV index 8 or very high.
Night
Cloudy periods with 40 percent chance of showers. Low 18.
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
12 PM 22 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 10
1 PM 22 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 10
2 PM 22 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 10
3 PM 22 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 10
4 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 10
5 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 S 15
6 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 S 15
7 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 S 15
8 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 VR 5
9 PM 23 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 VR 5
10 PM 22 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 VR 5
11 PM 22 A few clouds (20%)  A few clouds 20 VR 5
8 August 2026
12 AM 22 A few clouds (20%)  A few clouds 20 VR 5
1 AM 21 A few clouds (20%)  A few clouds 20 VR 5
2 AM 21 Partly cloudy (20%)  Partly cloudy 20 SW 15
3 AM 21 Partly cloudy (20%)  Partly cloudy 20 SW 15
4 AM 20 Partly cloudy (20%)  Partly cloudy 20 SW 15
5 AM 20 Partly cloudy (20%)  Partly cloudy 20 SW 15
6 AM 21 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 15
7 AM 21 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 15
8 AM 22 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 SW 20
9 AM 22 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 SW 20
10 AM 23 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 SW 20
11 AM 23 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 SW 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