Observed at: St. Catharines / Niagara District Airport
Date: Saturday August 15, 2020 at 05:00 EDT
Temp.: 17.4 °C
Wind: ENE 5 km/h
Humidity: 93 %
Dew point: 16.2 °C
Pressure: 101.6 kPa
Tendency:
Sunrise: 06:23
Sunset: 20:20
Normals:
Max 26°C Min 16°C
Yesterday
  Max: °C
  Min: °C
  Rainfall: mm

 Extended Forecast - Environment Canada
Saturday
Chance of showers (30%)
Chance of showers
Max: 28°C
Sunday
Chance of showers (60%)
Chance of showers
Max: 27°C
Monday
Chance of showers (60%)
Chance of showers
Max: 26°C
Tuesday
Sunny
Sunny
Max: 24°C
Wednesday
Sunny
Sunny
Max: 25°C
Thursday
Sunny
Sunny
Max: 26°C
Friday
Sunny
Sunny
Max: 25°C
Saturday night
Chance of showers (30%)
Chance of showers
Min: 19°C
Sunday night
Chance of showers (60%)
Chance of showers
Min: 18°C
Monday night
Chance of showers (40%)
Chance of showers
Min: 17°C
Tuesday night
Clear
Clear
Min: 17°C
Wednesday night
Clear
Clear
Min: 18°C
Thursday night
Clear
Clear
Min: 20°C
 

Forecast

St. Catharines, ON (Issued: Saturday August 15, 2020 at 05:00 EDT)

Today
Sunny this morning then a mix of sun and cloud with 30 percent chance of showers this afternoon. Risk of a thunderstorm this afternoon. High 28. Humidex 33. UV index 8 or very high.
Tonight
Partly cloudy with 30 percent chance of showers and risk of a thunderstorm. Low 19.
Sunday
Mainly cloudy with 60 percent chance of showers. Risk of a thunderstorm late in the afternoon. High 27. Humidex 33. UV index 6 or high.
Sunday night
Cloudy with 60 percent chance of showers. Low 18.
Monday
A mix of sun and cloud with 60 percent chance of showers. High 26.
Monday night
Cloudy periods with 40 percent chance of showers. Low 17.
Tuesday
Sunny. High 24.
Tuesday night
Clear. Low 17.
Wednesday
Sunny. High 25.
Wednesday night
Clear. Low 18.
Thursday
Sunny. High 26.
Thursday night
Clear. Low 20.
Friday
Sunny. High 25.
Averages and extremes
Highest temperature(1971-2000)31.5 °C1987
Lowest temperature(1971-2000)10.2 °C1992
Average high26.1 °C 
Average low15.9 °C 
Average21.0 °C 
Greatest rainfall(1971-2000)41.6 mm1985
Greatest snowfall(1971-2000)0.0 cm1971
Greatest precipitation(1971-2000)41.6 mm1985
Most snow on the ground(1971-2000)0.0 cm1971
Monthly frequency of precipitation31.0 % 

24 Hour Forecast - St. Catharines, ON

Date/Time
(EDT)
Temp.
(°C)

Weather Conditions

LOP †
Wind
(km/h)

Humidex
15 August 2020
07:00 19 Sunny (0%)  Sunny Nil NE 10
08:00 19 Sunny (0%)  Sunny Nil NE 10
09:00 21 Sunny (0%)  Sunny Nil NE 15 25
10:00 22 Sunny (0%)  Sunny Nil NE 15 27
11:00 24 Sunny (0%)  Sunny Nil NE 15 29
12:00 25 A mix of sun and cloud (0%)  A mix of sun and cloud Nil NE 10 30
13:00 27 A mix of sun and cloud (0%)  A mix of sun and cloud Nil NE 10 32
14:00 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 33
15:00 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 33
16:00 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 33
17:00 28 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 33
18:00 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 32
19:00 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 33
20:00 26 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 32
21:00 24 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 30
22:00 23 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low NE 10 29
23:00 21 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10 27
16 August 2020
00:00 20 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10 26
01:00 20 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10 25
02:00 19 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10
03:00 19 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10
04:00 19 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10
05:00 19 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms Low SW 10
06:00 19 Chance of showers (30%)  Chance of showers Low SW 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