Observed at: St. Catharines / Niagara District Airport
Date: Thursday May 23, 2024 at 20:00 EDT
Mainly Sunny
Mainly Sunny
Temp.: 21.8 °C
Wind: SW 20 km/h
Humidity: 43 %
Dew point: 8.5 °C
Pressure: 101.1 kPa
Tendency: falling
Visibility: 24.1 km
Sunrise: 05:45
Sunset: 20:43
Normals:
Max 21°C Min 11°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
  Friday
Sunny
Sunny
Max: 25°C
Saturday
Chance of showers (60%)
Chance of showers
Max: 23°C
Sunday
Sunny
Sunny
Max: 22°C
Monday
Chance of showers (60%)
Chance of showers
Max: 19°C
Tuesday
Chance of showers (40%)
Chance of showers
Max: 16°C
Wednesday
Cloudy
Cloudy
Max: 14°C
Thursday night
Clear
Clear
Min: 14°C
Friday night
Clear
Clear
Min: 12°C
Saturday night
Cloudy periods
Cloudy periods
Min: 17°C
Sunday night
Chance of showers (60%)
Chance of showers
Min: 18°C
Monday night
Chance of showers (40%)
Chance of showers
Min: 14°C
Tuesday night
Cloudy
Cloudy
Min: 12°C

Forecast

St. Catharines, ON (Issued: Thursday May 23, 2024 at 15:30 EDT)

Tonight
Clear. Wind southwest 20 km/h gusting to 40 becoming light this evening. Low 14.
Friday
Sunny. High 25. Humidex 27. UV index 7 or high.
Friday night
Clear. Low 12.
Saturday
A mix of sun and cloud with 60 percent chance of showers. High 23.
Saturday night
Cloudy periods. Low 17.
Sunday
Sunny. High 22.
Sunday night
Cloudy with 60 percent chance of showers. Low 18.
Monday
Cloudy with 60 percent chance of showers. High 19.
Monday night
Cloudy with 40 percent chance of showers. Low 14.
Tuesday
Cloudy with 40 percent chance of showers. High 16.
Tuesday night
Cloudy. Low 12.
Wednesday
Cloudy. High 14.
Averages and extremes
Highest temperature(1972-2000)29.1 °C1977
Lowest temperature(1972-2000)4.0 °C1992
Average high21.0 °C 
Average low9.4 °C 
Average15.2 °C 
Greatest rainfall(1972-2000)18.0 mm1999
Greatest snowfall(1972-2000)0.0 cm1972
Greatest precipitation(1972-2000)18.0 mm1999
Most snow on the ground(1972-2000)0.0 cm1972
Monthly frequency of precipitation37.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)

Humidex
23 May 2024
21:00 21 A few clouds (0%)  A few clouds Nil W 15
22:00 19 Clear (0%)  Clear Nil W 15
23:00 18 Clear (0%)  Clear Nil SW 10
24 May 2024
00:00 17 Clear (0%)  Clear Nil SW 10
01:00 16 Clear (0%)  Clear Nil SW 10
02:00 15 Clear (0%)  Clear Nil SW 10
03:00 15 Clear (0%)  Clear Nil SW 10
04:00 14 Clear (0%)  Clear Nil SW 10
05:00 14 Clear (0%)  Clear Nil NW 10
06:00 15 Sunny (0%)  Sunny Nil NW 10
07:00 16 Sunny (0%)  Sunny Nil NW 10
08:00 17 Sunny (0%)  Sunny Nil VR 5
09:00 18 Sunny (0%)  Sunny Nil VR 5
10:00 19 Sunny (0%)  Sunny Nil VR 5
11:00 20 Sunny (0%)  Sunny Nil VR 5
12:00 21 Sunny (0%)  Sunny Nil VR 5
13:00 23 Sunny (0%)  Sunny Nil VR 5
14:00 24 Sunny (0%)  Sunny Nil VR 5 25
15:00 24 Sunny (0%)  Sunny Nil VR 5 25
16:00 25 Sunny (0%)  Sunny Nil VR 5 27
17:00 25 Sunny (0%)  Sunny Nil VR 5 27
18:00 23 Sunny (0%)  Sunny Nil VR 5 25
19:00 21 Sunny (0%)  Sunny Nil VR 5
20:00 19 Sunny (0%)  Sunny Nil 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%
‡ Value not significant

Environment Canada