Observed at: St. Catharines Airport
Date: Tuesday April 24, 2018 at 02:00 EDT
Temp.: 5.3 °C
Wind: W 8 km/h
Humidity: 76 %
Dew point: 1.4 °C
Pressure: 102.2 kPa
Tendency:
Sunrise: 06:21
Sunset: 20:09
Normals:
Max 15°C Min 4°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
  Tuesday
Chance of showers (60%)
Chance of showers
Max: 16°C
Wednesday
Periods of rain
Periods of rain
Max: 10°C
Thursday
Chance of showers (40%)
Chance of showers
Max: 12°C
Friday
A mix of sun and cloud
A mix of sun and cloud
Max: 14°C
Saturday
Chance of showers (40%)
Chance of showers
Max: 13°C
Sunday
Sunny
Sunny
Max: 12°C
Monday night
A few clouds
A few clouds
Min: 5°C
Tuesday night
Periods of rain
Periods of rain
Min: 9°C
Wednesday night
Periods of rain
Periods of rain
Min: 6°C
Thursday night
Cloudy periods
Cloudy periods
Min: 5°C
Friday night
Chance of showers (60%)
Chance of showers
Min: 6°C
Saturday night
Cloudy periods
Cloudy periods
Min: 4°C

Forecast

St. Catharines, ON (Issued: Monday April 23, 2018 at 15:30 EDT)

Tonight
Clear. Increasing cloudiness overnight. Wind northeast 20 km/h becoming light this evening. Low plus 5.
Tuesday
Mainly cloudy. 60 percent chance of showers late in the afternoon. High 16 except 10 near Lake Ontario. UV index 6 or high.
Tuesday night
Periods of rain. Fog patches overnight. Low 9.
Wednesday
Periods of rain. High 10.
Wednesday night
Periods of rain. Low 6.
Thursday
Cloudy with 40 percent chance of showers. High 12.
Thursday night
Cloudy periods. Low plus 5.
Friday
A mix of sun and cloud. High 14.
Friday night
Cloudy with 60 percent chance of showers. Low 6.
Saturday
Cloudy with 40 percent chance of showers. High 13.
Saturday night
Cloudy periods. Low plus 4.
Sunday
Sunny. High 12.
Averages and extremes
Highest temperature(1972-2000)24.2 °C1990
Lowest temperature(1972-2000)-1.7 °C1989
Average high14.2 °C 
Average low3.6 °C 
Average8.9 °C 
Greatest rainfall(1972-2000)16.6 mm1992
Greatest snowfall(1972-2000)0.0 cm1972
Greatest precipitation(1972-2000)16.6 mm1992
Most snow on the ground(1972-2000)0.0 cm1972
Monthly frequency of precipitation46.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)
24 April 2018
04:00 5 Partly cloudy (0%)  Partly cloudy Nil VR 5
05:00 5 Mainly cloudy (0%)  Mainly cloudy Nil VR 5
06:00 6 Mainly cloudy (10%)  Mainly cloudy Low S 10
07:00 7 Mainly cloudy (10%)  Mainly cloudy Low S 10
08:00 8 Mainly cloudy (10%)  Mainly cloudy Low S 10
09:00 9 Mainly cloudy (10%)  Mainly cloudy Low S 10
10:00 11 Mainly cloudy (10%)  Mainly cloudy Low S 10
11:00 12 Mainly cloudy (10%)  Mainly cloudy Low S 10
12:00 13 Mainly cloudy (10%)  Mainly cloudy Low S 10
13:00 15 Mainly cloudy (10%)  Mainly cloudy Low NE 15
14:00 16 Mainly cloudy (10%)  Mainly cloudy Low NE 15
15:00 16 Chance of showers (60%)  Chance of showers Medium NE 15
16:00 15 Chance of showers (60%)  Chance of showers Medium NE 15
17:00 15 Chance of showers (60%)  Chance of showers Medium NE 15
18:00 14 Chance of showers (60%)  Chance of showers Medium NE 15
19:00 13 Chance of showers (60%)  Chance of showers Medium NE 15
20:00 12 Periods of rain (100%)  Periods of rain High SE 10
21:00 11 Periods of rain (100%)  Periods of rain High SE 10
22:00 10 Periods of rain (100%)  Periods of rain High SE 10
23:00 9 Periods of rain (100%)  Periods of rain High SE 10
25 April 2018
00:00 9 Periods of rain (100%)  Periods of rain High SE 10
01:00 9 Periods of rain (100%)  Periods of rain High SE 10
02:00 9 Periods of rain (100%)  Periods of rain High E 10
03:00 9 Periods of rain (100%)  Periods of rain High 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%

Environment Canada