Observed at: St. Catharines / Niagara District Airport
Date: Monday September 25, 2023 at 08:00 EDT
Mostly Cloudy
Mostly Cloudy
Temp.: 15.7 °C
Wind: NNE 5 km/h
Humidity: 95 %
Dew point: 14.9 °C
Pressure: 102.0 kPa
Tendency: rising
Visibility: 24.1 km
Sunrise: 07:07
Sunset: 19:09
Normals:
Max 18°C Min 10°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
Monday
A mix of sun and cloud
A mix of sun and cloud
Max: 22°C
Tuesday
Chance of showers (30%)
Chance of showers
Max: 20°C
Wednesday
A mix of sun and cloud
A mix of sun and cloud
Max: 21°C
Thursday
Chance of showers (30%)
Chance of showers
Max: 20°C
Friday
Chance of showers (30%)
Chance of showers
Max: 19°C
Saturday
A mix of sun and cloud
A mix of sun and cloud
Max: 21°C
Sunday
A mix of sun and cloud
A mix of sun and cloud
Max: 21°C
Monday night
Chance of showers (30%)
Chance of showers
Min: 15°C
Tuesday night
Cloudy periods
Cloudy periods
Min: 16°C
Wednesday night
Clear
Clear
Min: 14°C
Thursday night
Chance of showers (30%)
Chance of showers
Min: 13°C
Friday night
Cloudy periods
Cloudy periods
Min: 13°C
Saturday night
Cloudy periods
Cloudy periods
Min: 12°C
 

Forecast

St. Catharines, ON (Issued: Monday September 25, 2023 at 05:00 EDT)

Today
A mix of sun and cloud. Becoming cloudy this afternoon. Wind becoming northeast 20 km/h gusting to 40 this morning. High 22. Humidex 25. UV index 6 or high.
Tonight
Cloudy with 30 percent chance of showers. Wind northeast 20 km/h becoming light this evening. Low 15.
Tuesday
Cloudy with 30 percent chance of showers in the morning and early in the afternoon then a mix of sun and cloud. Wind becoming east 20 km/h in the morning. High 20. UV index 4 or moderate.
Tuesday night
Cloudy periods. Low 16.
Wednesday
A mix of sun and cloud. High 21.
Wednesday night
Clear. Low 14.
Thursday
A mix of sun and cloud with 30 percent chance of showers. High 20.
Thursday night
Cloudy periods with 30 percent chance of showers. Low 13.
Friday
A mix of sun and cloud with 30 percent chance of showers. High 19.
Friday night
Cloudy periods. Low 13.
Saturday
A mix of sun and cloud. High 21.
Saturday night
Cloudy periods. Low 12.
Sunday
A mix of sun and cloud. High 21.
Averages and extremes
Highest temperature(1971-2000)24.4 °C1972
Lowest temperature(1971-2000)4.0 °C1989
Average high19.7 °C 
Average low9.8 °C 
Average14.8 °C 
Greatest rainfall(1971-2000)63.0 mm1994
Greatest snowfall(1971-2000)0.0 cm1971
Greatest precipitation(1971-2000)63.0 mm1994
Most snow on the ground(1971-2000)0.0 cm1971
Monthly frequency of precipitation36.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)

Humidex
25 September 2023
09:00 17 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20 gust 40
10:00 17 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
11:00 18 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
12:00 19 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
13:00 20 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
14:00 21 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
15:00 21 A mix of sun and cloud (20%)  A mix of sun and cloud Low NE 20
16:00 22 Cloudy (20%)  Cloudy Low NE 20 25
17:00 22 Cloudy (20%)  Cloudy Low NE 20 25
18:00 21 Chance of showers (30%)  Chance of showers Low NE 20
19:00 21 Chance of showers (30%)  Chance of showers Low NE 20
20:00 20 Chance of showers (30%)  Chance of showers Low E 10
21:00 19 Chance of showers (30%)  Chance of showers Low E 10
22:00 19 Chance of showers (30%)  Chance of showers Low E 10
23:00 18 Chance of showers (30%)  Chance of showers Low E 10
26 September 2023
00:00 17 Chance of showers (30%)  Chance of showers Low E 10
01:00 17 Chance of showers (30%)  Chance of showers Low E 10
02:00 16 Chance of showers (30%)  Chance of showers Low E 10
03:00 16 Chance of showers (30%)  Chance of showers Low E 10
04:00 15 Chance of showers (30%)  Chance of showers Low E 10
05:00 15 Chance of showers (30%)  Chance of showers Low E 10
06:00 15 Chance of showers (30%)  Chance of showers Low E 10
07:00 16 Chance of showers (30%)  Chance of showers Low E 10
08:00 16 Chance of showers (30%)  Chance of showers Low E 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