Observed at: St. Catharines Airport
Date: Monday November 20, 2017 at 19:00 EST
Mainly Clear
Mainly Clear
Temp.: 6.7 °C
Wind: SW 32 gust 48 km/h
Humidity: 58 %
Dew point: -0.9 °C
Pressure: 101.2 kPa
Tendency: falling
Visibility: 24.1 km
Sunrise: 07:16
Sunset: 16:49
Normals:
Max 7°C Min 0°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
  Tuesday
Chance of showers (60%)
Chance of showers
Max: 10°C
Wednesday
A mix of sun and cloud
A mix of sun and cloud
Max: 2°C
Thursday
A mix of sun and cloud
A mix of sun and cloud
Max: 5°C
Friday
A mix of sun and cloud
A mix of sun and cloud
Max: 8°C
Saturday
Chance of showers (60%)
Chance of showers
Max: 8°C
Sunday
Chance of flurries (40%)
Chance of flurries
Max: 1°C
Monday night
A few clouds
A few clouds
Min: 5°C
Tuesday night
A few rain showers or flurries
A few rain showers or flurries
Min: 0°C
Wednesday night
Cloudy periods
Cloudy periods
Min: -4°C
Thursday night
Cloudy periods
Cloudy periods
Min: 1°C
Friday night
Chance of showers (60%)
Chance of showers
Min: 6°C
Saturday night
Chance of rain showers or flurries (40%)
Chance of rain showers or flurries
Min: -2°C

Forecast

St. Catharines, ON (Issued: Monday November 20, 2017 at 15:30 EST)

Tonight
Partly cloudy. Becoming clear this evening. Wind southwest 30 km/h gusting to 50. Low plus 5.
Tuesday
Increasing cloudiness. 60 percent chance of showers late in the afternoon. Wind southwest 40 km/h gusting to 60. High 10.
Tuesday night
A few rain showers ending near midnight then mainly cloudy with 30 percent chance of flurries. Wind southwest 40 km/h gusting to 60 becoming northwest 30 gusting to 50 in the evening. Low zero.
Wednesday
A mix of sun and cloud. High plus 2.
Wednesday night
Cloudy periods. Low minus 4.
Thursday
A mix of sun and cloud. High plus 5.
Thursday night
Cloudy periods. Low plus 1.
Friday
A mix of sun and cloud. High 8.
Friday night
Cloudy with 60 percent chance of showers. Windy. Low 6.
Saturday
Cloudy with 60 percent chance of showers. Windy. High 8.
Saturday night
Cloudy with 40 percent chance of rain showers or flurries. Windy. Low minus 2.
Sunday
Cloudy with 40 percent chance of flurries. High plus 1.
Averages and extremes
Highest temperature(1971-2000)20.6 °C1991
Lowest temperature(1971-2000)-8.0 °C1987
Average high7.4 °C 
Average low0.2 °C 
Average3.8 °C 
Greatest rainfall(1971-2000)22.0 mm1988
Greatest snowfall(1971-2000)13.6 cm1986
Greatest precipitation(1971-2000)22.0 mm1988
Most snow on the ground(1971-1999)5.0 cm1972
Monthly frequency of precipitation47.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EST)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)
20 November 2017
20:00 6 Partly cloudy (0%)  Partly cloudy Nil SW 30 gust 50
21:00 5 Clear (0%)  Clear Nil SW 30 gust 50
22:00 5 Clear (0%)  Clear Nil SW 30 gust 50
23:00 5 Clear (0%)  Clear Nil SW 30 gust 50
21 November 2017
00:00 5 Clear (0%)  Clear Nil SW 30 gust 50
01:00 5 Clear (0%)  Clear Nil SW 30 gust 50
02:00 5 Clear (0%)  Clear Nil SW 30 gust 50
03:00 5 Clear (0%)  Clear Nil SW 30 gust 50
04:00 5 Clear (0%)  Clear Nil SW 30 gust 50
05:00 5 Clear (0%)  Clear Nil SW 30 gust 50
06:00 6 Clear (0%)  Clear Nil SW 30 gust 50
07:00 6 Sunny (0%)  Sunny Nil SW 30 gust 50
08:00 7 Sunny (0%)  Sunny Nil SW 30 gust 50
09:00 8 Mainly sunny (0%)  Mainly sunny Nil SW 40 gust 60
10:00 9 Mainly sunny (0%)  Mainly sunny Nil SW 40 gust 60
11:00 9 A mix of sun and cloud (0%)  A mix of sun and cloud Nil SW 40 gust 60
12:00 10 A mix of sun and cloud (0%)  A mix of sun and cloud Nil SW 40 gust 60
13:00 10 Mainly cloudy (0%)  Mainly cloudy Nil SW 40 gust 60
14:00 10 Cloudy (0%)  Cloudy Nil SW 40 gust 60
15:00 9 Cloudy (0%)  Cloudy Nil SW 40 gust 60
16:00 9 Chance of showers (60%)  Chance of showers Medium SW 40 gust 60
17:00 8 Chance of showers (60%)  Chance of showers Medium SW 40 gust 60
18:00 8 A few showers (100%)  A few showers High SW 40 gust 60
19:00 7 A few showers (100%)  A few showers High SW 40 gust 60
 
† 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