Observed at: St. Catharines Airport
Date: Sunday October 21, 2018 at 09:00 EDT
Mostly Cloudy
Mostly Cloudy
Temp.: 3.3 °C
Wind: NNW 20 km/h
Humidity: 68 %
Dew point: -1.9 °C
Pressure: 102.2 kPa
Tendency:
Visibility: 24.1 km
Sunrise: 07:38
Sunset: 18:26
Normals:
Max 13°C Min 4°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
Sunday
Chance of flurries or rain showers (40%)
Chance of flurries or rain showers
Max: 6°C
Monday
Mainly cloudy
Mainly cloudy
Max: 12°C
Tuesday
Chance of showers (30%)
Chance of showers
Max: 12°C
Wednesday
A mix of sun and cloud
A mix of sun and cloud
Max: 9°C
Thursday
Sunny
Sunny
Max: 8°C
Friday
A mix of sun and cloud
A mix of sun and cloud
Max: 9°C
Saturday
Chance of showers (30%)
Chance of showers
Max: 10°C
Sunday night
Chance of showers (30%)
Chance of showers
Min: 3°C
Monday night
Chance of showers (30%)
Chance of showers
Min: 5°C
Tuesday night
Chance of showers (30%)
Chance of showers
Min: 5°C
Wednesday night
Cloudy periods
Cloudy periods
Min: 3°C
Thursday night
Clear
Clear
Min: 2°C
Friday night
Cloudy periods
Cloudy periods
Min: 3°C
 

Forecast

St. Catharines, ON (Issued: Sunday October 21, 2018 at 05:00 EDT)

Today
A mix of sun and cloud. 40 percent chance of flurries or rain showers this morning. Wind northwest 20 km/h gusting to 40. High 6. UV index 3 or moderate.
Tonight
Mainly cloudy. 30 percent chance of showers this evening. Wind west 20 km/h. Low plus 3.
Monday
Mainly cloudy. Wind southwest 20 km/h gusting to 40. High 12.
Monday night
Cloudy periods with 30 percent chance of showers. Low plus 5.
Tuesday
A mix of sun and cloud with 30 percent chance of showers. High 12.
Tuesday night
Cloudy periods with 30 percent chance of showers. Low plus 5.
Wednesday
A mix of sun and cloud. High 9.
Wednesday night
Cloudy periods. Low plus 3.
Thursday
Sunny. High 8.
Thursday night
Clear. Low plus 2.
Friday
A mix of sun and cloud. High 9.
Friday night
Cloudy periods. Low plus 3.
Saturday
A mix of sun and cloud with 30 percent chance of showers. High 10.
Averages and extremes
Highest temperature(1971-2000)24.0 °C1979
Lowest temperature(1971-2000)-1.7 °C1974
Average high13.7 °C 
Average low4.7 °C 
Average9.2 °C 
Greatest rainfall(1971-2000)13.6 mm1981
Greatest snowfall(1971-2000)0.0 cm1971
Greatest precipitation(1971-2000)13.6 mm1981
Most snow on the ground(1971-2000)0.0 cm1971
Monthly frequency of precipitation38.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)
21 October 2018
10:00 1 Chance of flurries or rain showers (40%)  Chance of flurries or rain showers Low NW 20
11:00 1 Chance of flurries or rain showers (40%)  Chance of flurries or rain showers Low NW 20
12:00 2 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
13:00 2 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
14:00 3 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
15:00 4 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
16:00 5 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
17:00 6 A mix of sun and cloud (20%)  A mix of sun and cloud Low NW 20 gust 40
18:00 5 Chance of showers (30%)  Chance of showers Low W 20
19:00 5 Chance of showers (30%)  Chance of showers Low W 20
20:00 4 Chance of showers (30%)  Chance of showers Low W 20
21:00 4 Chance of showers (30%)  Chance of showers Low W 20
22:00 3 Chance of showers (30%)  Chance of showers Low W 20
23:00 3 Chance of showers (30%)  Chance of showers Low W 20
22 October 2018
00:00 3 Mainly cloudy (20%)  Mainly cloudy Low W 20
01:00 3 Mainly cloudy (20%)  Mainly cloudy Low W 20
02:00 3 Mainly cloudy (20%)  Mainly cloudy Low W 20
03:00 3 Mainly cloudy (20%)  Mainly cloudy Low SW 20
04:00 3 Mainly cloudy (20%)  Mainly cloudy Low SW 20
05:00 3 Mainly cloudy (20%)  Mainly cloudy Low SW 20
06:00 4 Mainly cloudy (20%)  Mainly cloudy Low SW 20
07:00 4 Mainly cloudy (20%)  Mainly cloudy Low SW 20
08:00 5 Mainly cloudy (20%)  Mainly cloudy Low SW 20
09:00 6 Mainly cloudy (20%)  Mainly cloudy Low SW 20 gust 40
 
† 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