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Updated: 22/05/2025 14:50

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Rainfall Warning

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2:16 p.m. EDT Thursday 22 May 2025

Rainfall Warning in effect for:

St. Catharines - Grimsby - Northern Niagara Region

What:
Rain, at times heavy, is expected.

Hazard:
Total rainfall amounts of 50 to 60 mm.

Timing:
Through this afternoon.

Additional information:
Near 30 mm rain has been reported as of this morning in this area. Additional 20 to 30 mm rain is expected before rain tapers off to showers this evening.

Localized flooding in low-lying areas is possible.

Watch for possible washouts near rivers, creeks and culverts.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Observed at: St. Catharines / Niagara District Airport Date: 5:00 PM EDT Thursday 22 May 2025
Light Rain	Temp.: 11 °C Wind: S 14 km/h Humidity: 97 % Dew point: 11 °C Pressure: 100.4 kPa Tendency: 0.04 kPa Visibility: 13 km	Sunrise: 5:47 Sunset: 20:41 Normals: Max 21°C Min 10°C

Extended Forecast - Environment Canada
	Fri, 23 May Periods of rain Max: 13°C	Sat, 24 May Cloudy Max: 12°C	Sun, 25 May A mix of sun and cloud Max: 15°C	Mon, 26 May A mix of sun and cloud Max: 17°C	Tue, 27 May Cloudy Max: 15°C	Wed, 28 May Chance of showers Max: 15°C
Tonight Periods of rain Min: 9°C	Night Chance of showers Min: 8°C	Night Cloudy periods Min: 8°C	Night Cloudy periods Min: 9°C	Night Cloudy periods Min: 11°C	Night Chance of showers Min: 11°C

Forecast

St. Catharines, ON (Issued: 3:30 PM EDT Thursday 22 May 2025)

Tonight: Periods of rain. Amount 5 to 10 mm. Wind becoming west 20 km/h gusting to 40 after midnight. Low 9.
Fri, 23 May: Periods of rain ending in the afternoon then cloudy with 40 percent chance of showers. Amount 5 mm. Wind west 20 km/h gusting to 40. High 13. UV index 2 or low.
Night: Cloudy with 40 percent chance of showers. Wind west 20 km/h gusting to 40. Low 8.
Sat, 24 May: Cloudy. High 12.
Night: Cloudy periods. Low 8.
Sun, 25 May: A mix of sun and cloud. High 15.
Night: Cloudy periods. Low 9.
Mon, 26 May: A mix of sun and cloud. High 17.
Night: Cloudy periods. Low 11.
Tue, 27 May: Cloudy. High 15.
Night: Cloudy with 60 percent chance of showers. Low 11.
Wed, 28 May: Cloudy with 60 percent chance of showers. High 15.

24 Hour Forecast - St. Catharines, ON

Date/Time	Temp. (°C)	Weather Conditions	LOP †	Wind (km/h)
22 May 2025
6 PM	14	Periods of rain	80	S 10
7 PM	13	Periods of rain	80	S 10
8 PM	12	Periods of rain	80	VR 5
9 PM	12	Periods of rain	80	VR 5
10 PM	11	Periods of rain	80	VR 5
11 PM	11	Periods of rain	80	W 10
23 May 2025
12 AM	11	Periods of rain	80	W 10
1 AM	10	Periods of rain	80	W 10
2 AM	10	Periods of rain	80	W 20 gust 40
3 AM	10	Periods of rain	80	W 20 gust 40
4 AM	9	Periods of rain	80	W 20 gust 40
5 AM	9	Periods of rain	80	W 20 gust 40
6 AM	9	Periods of rain	80	W 20 gust 40
7 AM	9	Periods of rain	80	W 20 gust 40
8 AM	9	Periods of rain	80	W 20 gust 40
9 AM	9	Periods of rain	80	W 20 gust 40
10 AM	9	Periods of rain	80	W 20 gust 40
11 AM	9	Periods of rain	80	W 20 gust 40
12 PM	9	Periods of rain	80	W 20 gust 40
1 PM	10	Periods of rain	80	W 20 gust 40
2 PM	10	Chance of showers	40	W 20 gust 40
3 PM	11	Chance of showers	40	W 20 gust 40
4 PM	12	Chance of showers	40	W 20 gust 40
5 PM	13	Chance of showers	40	W 20 gust 40

† 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%

Environment Canada