Forecast

Extended Forecast - Environment Canada
	Sat, 23 May Rain Max: 12°C	Sun, 24 May Chance of showers Max: 21°C	Mon, 25 May Chance of showers Max: 22°C	Tue, 26 May Sunny Max: 23°C	Wed, 27 May Sunny Max: 23°C	Thu, 28 May Sunny Max: 23°C
Tonight Partly cloudy Min: 12°C	Night Rain Min: 11°C	Night Chance of showers Min: 11°C	Night Clear Min: 13°C	Night Chance of showers Min: 14°C	Night Clear Min: 14°C

Tonight: Partly cloudy. Becoming cloudy near midnight. Wind east 20 km/h gusting to 40 becoming light late this evening. Low 12.
Sat, 23 May: Cloudy. Rain beginning in the morning. Amount 10 to 20 mm. Wind becoming southeast 30 km/h gusting to 50 in the morning. Temperature steady near 12. UV index 2 or low.
Night: Rain. Amount 10 mm. Wind east 20 km/h becoming light in the evening. Low 11.
Sun, 24 May: Cloudy with 40 percent chance of showers. High 21.
Night: Cloudy with 40 percent chance of showers. Low 11.
Mon, 25 May: Cloudy with 30 percent chance of showers. High 22.
Night: Clear. Low 13.
Tue, 26 May: Sunny. High 23.
Night: Cloudy periods with 30 percent chance of showers. Low 14.
Wed, 27 May: Sunny. High 23.
Night: Clear. Low 14.
Thu, 28 May: Sunny. High 23.

24 Hour Forecast - St. Catharines, ON

Date/Time	Temp. (°C)	Weather Conditions	LOP †	Wind (km/h)
22 May 2026
6 PM	14	A mix of sun and cloud	0	E 20 gust 40
7 PM	14	A mix of sun and cloud	0	E 20 gust 40
8 PM	13	A mix of sun and cloud	0	E 20
9 PM	13	Partly cloudy	0	E 20
10 PM	13	Partly cloudy	0	E 20
11 PM	12	Mainly cloudy	0	E 15
23 May 2026
12 AM	12	Cloudy	20	E 15
1 AM	13	Cloudy	20	E 15
2 AM	13	Cloudy	20	E 10
3 AM	13	Cloudy	20	E 10
4 AM	12	Cloudy	20	E 10
5 AM	12	Cloudy	20	E 10
6 AM	12	Cloudy	20	E 10
7 AM	12	Cloudy	20	E 10
8 AM	12	Rain	80	SE 30 gust 50
9 AM	12	Rain	80	SE 30 gust 50
10 AM	13	Rain	80	SE 30 gust 50
11 AM	13	Rain	80	E 20 gust 40
12 PM	13	Rain	100	E 20 gust 40
1 PM	12	Rain	100	E 20 gust 40
2 PM	12	Rain	100	E 20
3 PM	12	Rain	100	E 20
4 PM	12	Rain	100	E 20
5 PM	12	Rain	100	E 20

† 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%