St. Catharines - Weather - Environment Canada Environment Canada https://weather.gc.ca 2026-09-10T06:32:17Z tag:weather.gc.ca,2013-04-16:20260910063217 https://weather.gc.ca/cacheable/images/img/wmms-alt.png https://weather.gc.ca/template/gcweb/v15.0.0/GCWeb/assets/favicon.ico Copyright 2026, Environment Canada No watches or warnings in effect, St. Catharines 2026-09-03T00:42:21Z 2026-09-03T00:42:21Z No watches or warnings in effect. tag:weather.gc.ca,2013-04-16:43.16-79.245_w1:20260903004221 Current Conditions: 21.0°C 2026-09-10T06:00:00Z 2026-09-10T06:00:00Z Observed at: St. Catharines / Niagara District Airport 2:00 AM EDT Thursday 10 September 2026
Temperature: 21.0°C
Pressure: 101.1 kPa
Humidity: 93 %
Humidex: 28
Dewpoint: 19.9°C
Wind: WSW 17 km/h
Air Quality Health Index: 2
]]> tag:weather.gc.ca,2013-04-16:43.16-79.245_cc:20260910060000 Wednesday night: A few showers. Low 19. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A few showers ending this evening then partly cloudy. Risk of a thunderstorm early this evening. Local amount 10 to 15 mm. Wind southwest 30 km/h gusting to 50 becoming light late this evening. Low 19. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc0:20260909193000 Thursday: A mix of sun and cloud. High 24. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A mix of sun and cloud. Wind becoming west 20 km/h in the afternoon. High 24. Humidex 29. UV index 7 or high. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc1:20260909193000 Thursday night: Clear. Low 12. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Clear. Wind west 20 km/h becoming light late in the evening. Low 12. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc2:20260909193000 Friday: Sunny. High 22. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Sunny. High 22. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc3:20260909193000 Friday night: Clear. Low 15. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Clear. Low 15. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc4:20260909193000 Saturday: A mix of sun and cloud. High 25. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A mix of sun and cloud. High 25. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc5:20260909193000 Saturday night: Chance of showers. Low 19. POP 40% 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Cloudy periods with 40 percent chance of showers. Low 19. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc6:20260909193000 Sunday: A mix of sun and cloud. High 25. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A mix of sun and cloud. High 25. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc7:20260909193000 Sunday night: Cloudy periods. Low 15. 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Cloudy periods. Low 15. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc8:20260909193000 Monday: Chance of showers. High 23. POP 30% 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A mix of sun and cloud with 30 percent chance of showers. High 23. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc9:20260909193000 Monday night: Chance of showers. Low 19. POP 40% 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z Cloudy periods with 40 percent chance of showers. Low 19. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc10:20260909193000 Tuesday: Chance of showers. High 26. POP 60% 2026-09-09T19:30:00Z 2026-09-09T19:30:00Z A mix of sun and cloud with 60 percent chance of showers. High 26. Forecast issued 3:30 PM EDT Wednesday 9 September 2026 tag:weather.gc.ca,2013-04-16:43.16-79.245_fc11:20260909193000