What is today's weather forecast for Saint Catharines, ON?

Today's forecast for Saint Catharines shows a high of 52 degrees and a low of 44 degrees Fahrenheit. Partly Cloudy with a high near 52 F.

What is the 7-day weather forecast for Saint Catharines, ON?

The 7-day forecast for Saint Catharines shows highs from 28 to 52 degrees and lows from 22 to 44 degrees Fahrenheit. Expect precipitation on 9 days with chances of 20% or higher.

Will it rain in Saint Catharines, ON this week?

Yes, rain is possible in Saint Catharines this week. Precipitation chances: Thursday (80% chance), Friday (30% chance), Saturday (30% chance), Monday (30% chance), Tuesday (30% chance), Wednesday (20% chance), Thursday (20% chance), Friday (20% chance), Saturday (20% chance).

How accurate is the Saint Catharines weather forecast?

WeatherForYou provides highly accurate Saint Catharines forecasts using National Weather Service data and current conditions from the nearest available weather stations, often miles closer than regional airports, for the most precise local forecasts.

Saint Catharines, ON Weather Forecast and Current Conditions

Current Conditions From Nearby Local Station

Switch to Metric Units

44°F
Feels Like 43°F

Humidity 68% Dew Point 34°F Wind S 3 MPH Gusts 6 Barometer 29.76 in.

Solar Rad 131 w/m² UV Index 1

Report from a personal weather station 3.3 mi. WNW of central Saint Catharines
at 10:24 AM Thu, Dec 18, 2025

Point Forecast at a Glance

ThuDec 18

FriDec 19

30%

SatDec 20

SunDec 21

MonDec 22

TueDec 23

30%

WedDec 24

20%

Jump to detailed forecast ↓

7-Day Temperature Trend

Week Ahead Summary

High temperatures drop from 52°F to a low of 28°F, then recover to 35°F by week's end. Unsettled weather expected with wintry mix likely on at least 7 days.

Climate Context

This week's forecast shows temperatures running 1°F below the historical average for December. Normal highs for this period are around 38°F with lows around 25°F.

This Date in Weather History

1957 - A tornado swept across Jackson County, Williamson County and Franklin County in southern Illinois killing eleven persons.

Saint Catharines, ON 7 Day Weather Forecast Details

Thursday Dec 18

Day: Partly Cloudy with a high near 52 F. Winds from the SSE at 8 mph

Night: Mostly Cloudy with Showers with a low near 44 F. Winds from the S at 16 mph. Chance of precipitation is 80%

Friday Dec 19

Day: Mostly Cloudy with Light Wintry Mix with a high near 40 F. Winds from the WSW at 18 mph. Chance of precipitation is 30%

Night: Mostly Cloudy with Snow Showers with a low near 22 F. Winds from the W at 24 mph. Chance of precipitation is 30%

Saturday Dec 20

Day: Mostly Cloudy with Showers with a high near 38 F. Winds from the SW at 9 mph. Chance of precipitation is 10%

Night: Mostly Cloudy with Light Wintry Mix with a low near 29 F. Winds from the SW at 15 mph. Chance of precipitation is 30%

Sunday Dec 21

Day: Mostly Cloudy with Snow Showers with a high near 28 F. Winds from the W at 19 mph. Chance of precipitation is 10%

Night: Mostly Cloudy with a low near 22 F. Winds from the W at 17 mph

Monday Dec 22

Day: Partly Cloudy with a high near 30 F. Winds from the W at 7 mph

Night: Mostly Cloudy with Snow Showers with a low near 27 F. Winds from the SW at 6 mph. Chance of precipitation is 30%

Tuesday Dec 23

Day: Mostly Cloudy with Showers with a high near 39 F. Winds from the SSW at 10 mph. Chance of precipitation is 30%

Night: Mostly Cloudy with Snow Showers with a low near 31 F. Winds from the WSW at 11 mph. Chance of precipitation is 20%

Wednesday Dec 24

Day: Partly Cloudy with Snow Showers with a high near 35 F. Winds from the NW at 7 mph. Chance of precipitation is 20%

Night: Mostly Cloudy with Snow Showers with a low near 31 F. Winds from the ENE at 7 mph. Chance of precipitation is 20%

Thursday Dec 25

Day: Mostly Cloudy with Snow Showers with a high near 38 F. Winds from the ENE at 8 mph. Chance of precipitation is 20%

Night: Mostly Cloudy with Light Wintry Mix with a low near 33 F. Winds from the E at 9 mph. Chance of precipitation is 20%

Friday Dec 26

Day: Mostly Cloudy with Light Wintry Mix with a high near 36 F. Winds from the NNE at 9 mph. Chance of precipitation is 20%

Night: Mostly Cloudy with Light Wintry Mix with a low near 27 F. Winds from the NW at 9 mph. Chance of precipitation is 20%

Saturday Dec 27

Day: Mostly Cloudy with Snow Showers with a high near 31 F. Winds from the NW at 9 mph. Chance of precipitation is 20%

Night: Partly Cloudy with Snow Showers with a low near 25 F. Winds from the WNW at 11 mph. Chance of precipitation is 20%

How We Provide Better Local Weather

Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.

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