Observed at: St. Catharines / Niagara District Airport
Date: 10:00 AM EDT Friday 10 July 2026
Mostly Cloudy
Mostly Cloudy 		Temp.: 23 °C
Wind: NNE 8 km/h
Humidity: 87 %
Dew point: 21 °C
Pressure: 101.2 kPa
Tendency: 0.12 kPa
Visibility: 24 km 		Sunrise: 5:47
Sunset: 20:58
Normals:
Max 26°C Min 17°C
 Extended Forecast - Environment Canada
Today
Chance of showers (30%)
Chance of showers
Max: 28°C
 Sat, 11 Jul
Sunny
Sunny
Max: 27°C
 Sun, 12 Jul
Sunny
Sunny
Max: 28°C
 Mon, 13 Jul
Sunny
Sunny
Max: 31°C
 Tue, 14 Jul
Sunny
Sunny
Max: 32°C
 Wed, 15 Jul
A mix of sun and cloud
A mix of sun and cloud
Max: 31°C
 Thu, 16 Jul
Chance of showers (30%)
Chance of showers
Max: 29°C
Tonight
A few clouds
A few clouds
Min: 19°C
 Night
Clear
Clear
Min: 20°C
 Night
Clear
Clear
Min: 19°C
 Night
Clear
Clear
Min: 22°C
 Night
Clear
Clear
Min: 22°C
 Night
Cloudy periods
Cloudy periods
Min: 19°C
  

Forecast

St. Catharines, ON (Issued: 11:00 AM EDT Friday 10 July 2026)

Today
A mix of sun and cloud. 30 percent chance of showers this afternoon with risk of a thunderstorm. High 28. Humidex 36. UV index 8 or very high.
Tonight
A few clouds. Fog patches developing after midnight. Low 19.
Sat, 11 Jul
Sunny. Fog patches dissipating in the morning. Wind becoming northeast 20 km/h near noon. High 27. Humidex 32. UV index 8 or very high.
Night
Clear. Low 20.
Sun, 12 Jul
Sunny. High 28.
Night
Clear. Low 19.
Mon, 13 Jul
Sunny. High 31.
Night
Clear. Low 22.
Tue, 14 Jul
Sunny. High 32.
Night
Clear. Low 22.
Wed, 15 Jul
A mix of sun and cloud. High 31.
Night
Cloudy periods. Low 19.
Thu, 16 Jul
A mix of sun and cloud with 30 percent chance of showers. High 29.

24 Hour Forecast - St. Catharines, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
10 July 2026
11 AM 23 A mix of sun and cloud (10%)  A mix of sun and cloud 10 VR 5
12 PM 24 A mix of sun and cloud (10%)  A mix of sun and cloud 10 N 15
1 PM 25 A mix of sun and cloud (10%)  A mix of sun and cloud 10 N 15
2 PM 26 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 N 15
3 PM 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 N 15
4 PM 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 N 15
5 PM 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 N 15
6 PM 27 Sunny (10%)  Sunny 10 N 15
7 PM 27 Sunny (10%)  Sunny 10 N 15
8 PM 26 Mainly sunny (10%)  Mainly sunny 10 N 15
9 PM 25 A few clouds (10%)  A few clouds 10 NE 10
10 PM 23 A few clouds (10%)  A few clouds 10 NE 10
11 PM 22 Clear (10%)  Clear 10 NE 10
11 July 2026
12 AM 21 Clear (10%)  Clear 10 NE 10
1 AM 20 Clear (10%)  Clear 10 NE 10
2 AM 19 Clear (10%)  Clear 10 NE 10
3 AM 19 A few clouds (10%)  A few clouds 10 NE 10
4 AM 19 A few clouds (10%)  A few clouds 10 NE 10
5 AM 19 A few clouds (10%)  A few clouds 10 NE 10
6 AM 19 Mainly sunny (0%)  Mainly sunny 0 NE 10
7 AM 20 Mainly sunny (0%)  Mainly sunny 0 NE 10
8 AM 20 Sunny (0%)  Sunny 0 NE 10
9 AM 21 Sunny (0%)  Sunny 0 NE 10
10 AM 23 Sunny (0%)  Sunny 0 NE 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