Observed at: St. Catharines / Niagara District Airport
Date: 8:00 AM EDT Monday 27 July 2026
Mist
Mist 		Temp.: 20 °C
Wind: SSW 5 km/h
Humidity: 94 %
Dew point: 19 °C
Pressure: 101.0 kPa
Tendency: 0.10 kPa
Visibility: 10 km 		Sunrise: 6:02
Sunset: 20:44
Normals:
Max 26°C Min 17°C
 Extended Forecast - Environment Canada
Today
Chance of showers (40%)
Chance of showers
Max: 29°C
 Tue, 28 Jul
Chance of showers (60%)
Chance of showers
Max: 24°C
 Wed, 29 Jul
Chance of showers (30%)
Chance of showers
Max: 25°C
 Thu, 30 Jul
A mix of sun and cloud
A mix of sun and cloud
Max: 26°C
 Fri, 31 Jul
A mix of sun and cloud
A mix of sun and cloud
Max: 27°C
 Sat, 1 Aug
Chance of showers (30%)
Chance of showers
Max: 26°C
 Sun, 2 Aug
A mix of sun and cloud
A mix of sun and cloud
Max: 25°C
Tonight
Chance of showers (70%)
Chance of showers
Min: 20°C
 Night
Chance of showers (30%)
Chance of showers
Min: 18°C
 Night
Cloudy periods
Cloudy periods
Min: 17°C
 Night
Cloudy periods
Cloudy periods
Min: 18°C
 Night
Cloudy periods
Cloudy periods
Min: 19°C
 Night
Chance of showers (30%)
Chance of showers
Min: 18°C
  

Forecast

St. Catharines, ON (Issued: 6:03 AM EDT Monday 27 July 2026)

Today
A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Fog patches dissipating this morning. Wind becoming southwest 20 km/h this afternoon. High 29. Humidex 37. UV index 8 or very high.
Tonight
Mainly cloudy with 70 percent chance of showers and risk of a thunderstorm. Wind south 20 km/h. Low 20.
Tue, 28 Jul
Mainly cloudy with 60 percent chance of showers and risk of a thunderstorm. Wind south 20 km/h becoming northwest 30 gusting to 50 late in the morning. High 24. Humidex 32. UV index 6 or high.
Night
Cloudy with 30 percent chance of showers. Low 18.
Wed, 29 Jul
A mix of sun and cloud with 30 percent chance of showers. High 25.
Night
Cloudy periods. Low 17.
Thu, 30 Jul
A mix of sun and cloud. High 26.
Night
Cloudy periods. Low 18.
Fri, 31 Jul
A mix of sun and cloud. High 27.
Night
Cloudy periods. Low 19.
Sat, 1 Aug
A mix of sun and cloud with 30 percent chance of showers. High 26.
Night
Cloudy periods with 30 percent chance of showers. Low 18.
Sun, 2 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)
27 July 2026
9 AM 21 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
10 AM 22 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
11 AM 23 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
12 PM 25 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
1 PM 27 A mix of sun and cloud (20%)  A mix of sun and cloud 20 SW 10
2 PM 29 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 20
3 PM 28 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 20
4 PM 26 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 20
5 PM 25 Chance of showers. Risk of thunderstorms (40%)  Chance of showers. Risk of thunderstorms 40 SW 20
6 PM 25 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 20
7 PM 25 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 20
8 PM 25 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
9 PM 24 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
10 PM 24 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
11 PM 23 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
28 July 2026
12 AM 22 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
1 AM 21 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 SW 15
2 AM 20 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 S 20
3 AM 20 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 S 20
4 AM 20 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 S 20
5 AM 20 Chance of showers. Risk of thunderstorms (70%)  Chance of showers. Risk of thunderstorms 70 S 20
6 AM 20 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 S 20
7 AM 20 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 S 20
8 AM 20 Chance of showers. Risk of thunderstorms (60%)  Chance of showers. Risk of thunderstorms 60 S 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