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No watches or warnings in effect for St. Catharines, ON.

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Updated: @ 14/09/2026 20:30 - next update at 00:00  
Summary / Temperature Wind Rain Outlook
Night time, Dry, Mostly cloudy Night time, Dry, Mostly cloudy
Currently: 70.3, Max: 84.0, Min: 52.3 70.3°C
Colder 3.7°C than last hour.

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Feels like: 75.0°C

24-hr difference
5.8°CWarmer 5.8°C than yesterday at this time.
  Today Yesterday
High: 84°C
14:49 		76.5°C
15:14
Low: 52.3°C
06:56 		52.8°C
07:12
Wind from NNE NNE
0.7
Gust:
 0 km/h
0 Bft - Calm
Today: 17.3 km/h 15:22
Gust Month: 18.0 km/h September 13
Rain Today: 0 mm
Rain Rate (/hr): 0 mm
Rain Yesterday: 0 mm
Storm Rain: 0 mm
This Month: 0.05 mm
Season Total: 20.32 mm
1 rain day in September.
Tue, 15 Sep
Chance of showers (40%)
Chance of showers
Humidity & Barometer Almanac Moon
Humidity: 65 % Increased 9.0% since last hour.
Dew Point: 58°C Increased 0.7°C since last hour.
Barometer: 29.828 hPa  
Baro Trend: Rising slowly
Sunrise: 06:50
Sunset: 19:16
Moonrise: 11:41
Moonset: 20:51
Waxing Crescent
Waxing Crescent, Moon at 3 days in cycle
17%
Illuminated
UV Index Forecast UV Index Forecast
15/09/2026
6.4     High 
16/09/2026
6.0     High 
 EC Weather Forecast  - Outlook: Tonight & Tue, 15 Sep
Tonight
A few clouds
A few clouds
Min: 13°C
 EC forecast: Partly cloudy. Clearing late this evening. Low 13.
WXSIM forecast: Mostly clear. Low 48°. Wind south-southwest near calm in the evening, becoming north-northwest after midnight.
Davis VP+ forecast: Increasing clouds with little temp change.
 
Tue, 15 Sep
Chance of showers (40%)
Chance of showers
Max: 26°C
 EC forecast: A mix of sun and cloud. 40 percent chance of showers late in the afternoon. Wind becoming south 20 km/h gusting to 40 in the morning. High 26. Humidex 29. UV index 6 or high.
WXSIM forecast: Partly cloudy in the morning, becoming sunny in the afternoon. High 81°. UV index up to 6. Wind west around 3 mph.