Observed at: St. Catharines Airport
Date: Tuesday June 19, 2018 at 14:00 EDT
Partly Cloudy
Partly Cloudy
Temp.: 21.3 °C
Humidex: 22
Wind: NE 23 km/h
Humidity: 41 %
Dew point: 7.7 °C
Pressure: 101.6 kPa
Tendency: falling
Visibility: 24.1 km
Sunrise: 05:37
Sunset: 21:00
Normals:
Max 25°C Min 14°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
Tuesday
A mix of sun and cloud
A mix of sun and cloud
Max: 23°C
Wednesday
Mainly sunny
Mainly sunny
Max: 27°C
Thursday
A mix of sun and cloud
A mix of sun and cloud
Max: 23°C
Friday
A mix of sun and cloud
A mix of sun and cloud
Max: 24°C
Saturday
Chance of showers (40%)
Chance of showers
Max: 20°C
Sunday
Chance of showers (30%)
Chance of showers
Max: 20°C
Monday
Sunny
Sunny
Max: 22°C
Tuesday night
Partly cloudy
Partly cloudy
Min: 14°C
Wednesday night
Cloudy periods
Cloudy periods
Min: 16°C
Thursday night
Cloudy periods
Cloudy periods
Min: 16°C
Friday night
Cloudy periods
Cloudy periods
Min: 16°C
Saturday night
Chance of showers (30%)
Chance of showers
Min: 18°C
Sunday night
Cloudy periods
Cloudy periods
Min: 16°C
 

Forecast

St. Catharines, ON (Issued: Tuesday June 19, 2018 at 11:00 EDT)

Today
Sunny. Becoming a mix of sun and cloud this afternoon. Wind north 20 km/h. High 23. Humidex 28. UV index 10 or very high.
Tonight
Partly cloudy. Wind north 20 km/h becoming light this evening. Low 14.
Wednesday
Mainly sunny. High 27. Humidex 29. UV index 10 or very high.
Wednesday night
Cloudy periods. Low 16.
Thursday
A mix of sun and cloud. High 23.
Thursday night
Cloudy periods. Low 16.
Friday
A mix of sun and cloud. High 24.
Friday night
Cloudy periods. Low 16.
Saturday
Cloudy with 40 percent chance of showers. High 20.
Saturday night
Cloudy with 30 percent chance of showers. Low 18.
Sunday
Cloudy with 30 percent chance of showers. High 20.
Sunday night
Cloudy periods. Low 16.
Monday
Sunny. High 22.
Averages and extremes
Highest temperature(1972-2000)35.0 °C1995
Lowest temperature(1972-2000)9.9 °C1982
Average high24.8 °C 
Average low13.9 °C 
Average19.4 °C 
Greatest rainfall(1972-2000)25.6 mm1980
Greatest snowfall(1972-2000)0.0 cm1972
Greatest precipitation(1972-2000)25.6 mm1980
Most snow on the ground(1972-2000)0.0 cm1972
Monthly frequency of precipitation36.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)

Humidex
19 June 2018
15:00 22 A mix of sun and cloud (0%)  A mix of sun and cloud Nil N 20 26
16:00 21 A mix of sun and cloud (0%)  A mix of sun and cloud Nil N 20
17:00 20 A mix of sun and cloud (0%)  A mix of sun and cloud Nil N 20
18:00 19 A mix of sun and cloud (0%)  A mix of sun and cloud Nil N 20
19:00 19 A mix of sun and cloud (0%)  A mix of sun and cloud Nil N 20
20:00 18 A mix of sun and cloud (0%)  A mix of sun and cloud Nil NE 10
21:00 17 Partly cloudy (0%)  Partly cloudy Nil NE 10
22:00 16 Partly cloudy (0%)  Partly cloudy Nil NE 10
23:00 15 Partly cloudy (0%)  Partly cloudy Nil N 10
20 June 2018
00:00 15 Partly cloudy (0%)  Partly cloudy Nil N 10
01:00 14 Partly cloudy (0%)  Partly cloudy Nil N 10
02:00 14 Partly cloudy (0%)  Partly cloudy Nil N 10
03:00 14 Partly cloudy (0%)  Partly cloudy Nil N 10
04:00 14 Partly cloudy (0%)  Partly cloudy Nil N 10
05:00 14 Partly cloudy (0%)  Partly cloudy Nil N 10
06:00 15 Mainly sunny (0%)  Mainly sunny Nil N 10
07:00 16 Mainly sunny (0%)  Mainly sunny Nil N 10
08:00 17 Mainly sunny (0%)  Mainly sunny Nil N 15
09:00 19 Mainly sunny (0%)  Mainly sunny Nil N 15
10:00 20 Mainly sunny (0%)  Mainly sunny Nil N 15
11:00 22 Mainly sunny (0%)  Mainly sunny Nil NE 10
12:00 23 Mainly sunny (0%)  Mainly sunny Nil NE 10 25
13:00 24 Mainly sunny (0%)  Mainly sunny Nil NE 10 26
14:00 25 Mainly sunny (0%)  Mainly sunny Nil NE 10 27
 
† 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