Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™

St. Catharines, Ontario

72°F
Location Chevron down
Location News Videos
Use Current Location
Recent

St. Catharines

Ontario

72°
No results found.
Try searching for a city, zip code or point of interest.
settings
St. Catharines, Ontario Weather
Today WinterCast Local {stormName} Tracker Hourly Daily Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps
News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel
For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center
Today Hourly

Daily

 Radar MinuteCast® Monthly Air Quality Health & Activities

August 19 - October 2

Tue 8/19

75° /65°
69%
Cloudy with a brief shower or two this afternoon

RealFeel®77°

RealFeel Shade™73°

Max UV Index4.0 (Moderate)

WindSE 7 mph

Wed 8/20

72° /61°
55%
Variable cloudiness with a shower in places

RealFeel®72°

RealFeel Shade™71°

Max UV Index3.0 (Moderate)

WindNE 10 mph

Thu 8/21

72° /59°
25%
Partly sunny and nice

RealFeel®72°

RealFeel Shade™69°

Max UV Index7.0 (High)

WindENE 10 mph

Fri 8/22

78° /63°
1%
Warmer with plenty of sunshine

RealFeel®85°

RealFeel Shade™76°

Max UV Index7.0 (High)

WindNNE 5 mph

Sat 8/23

82° /65°
25%
Times of sun and clouds

RealFeel®91°

RealFeel Shade™82°

Max UV Index6.0 (High)

WindSW 5 mph

Sun 8/24

77° /59°
2%
Mostly sunny and nice

RealFeel®80°

RealFeel Shade™74°

Max UV Index7.0 (High)

WindWSW 9 mph

Mon 8/25

73° /57°
11%
Mostly sunny, pleasant and less humid

RealFeel®75°

RealFeel Shade™69°

Max UV Index7.0 (High)

WindW 10 mph

Tue 8/26

72° /56°
55%
Partly sunny with a couple of showers in the afternoon

RealFeel®70°

RealFeel Shade™67°

Max UV Index7.0 (High)

WindW 12 mph

Wed 8/27

73° /57°
62%
Sunshine and some clouds with a couple of showers in the afternoon

RealFeel®73°

RealFeel Shade™70°

Max UV Index7.0 (High)

WindWSW 10 mph

Thu 8/28

76° /60°
1%
Increasing cloudiness

RealFeel®78°

RealFeel Shade™75°

Max UV Index5.0 (Moderate)

WindWSW 4 mph

Fri 8/29

76° /62°
9%
Times of clouds and sun

RealFeel®79°

RealFeel Shade™75°

Max UV Index6.0 (High)

WindESE 6 mph

Sat 8/30

77° /63°
55%
Cloudy with a bit of rain in the afternoon

RealFeel®78°

RealFeel Shade™77°

Max UV Index3.0 (Moderate)

WindSSW 5 mph

Sun 8/31

76° /62°
55%
Mostly cloudy with a bit of rain

RealFeel®75°

RealFeel Shade™72°

Max UV Index6.0 (High)

WindW 10 mph

Mon 9/1

77° /57°
55%
A passing shower in the morning; otherwise, times of clouds and sun

RealFeel®80°

RealFeel Shade™76°

Max UV Index4.0 (Moderate)

WindESE 4 mph

Tue 9/2

80° /62°
55%
Mostly cloudy with a touch of rain

RealFeel®78°

RealFeel Shade™78°

Max UV Index2.0 (Low)

WindNNE 13 mph

Wed 9/3

73° /60°
20%
Turning cloudy

RealFeel®75°

RealFeel Shade™71°

Max UV Index6.0 (High)

WindSE 6 mph

Thu 9/4

78° /63°
64%
A couple of morning showers and a thunderstorm; otherwise, cloudy and humid

RealFeel®82°

RealFeel Shade™82°

Max UV Index1.0 (Low)

WindWSW 7 mph

Fri 9/5

79° /62°
25%
Cloudy and humid

RealFeel®80°

RealFeel Shade™80°

Max UV Index2.0 (Low)

WindNNE 5 mph

Sat 9/6

79° /62°
20%
Mostly sunny and humid

RealFeel®84°

RealFeel Shade™78°

Max UV Index6.0 (High)

WindNNE 6 mph

Sun 9/7

78° /61°
25%
Mostly sunny and humid

RealFeel®84°

RealFeel Shade™78°

Max UV Index6.0 (High)

WindNE 6 mph

Mon 9/8

79° /62°
40%
Humid with variable cloudiness; a thunderstorm in spots in the afternoon

RealFeel®81°

RealFeel Shade™81°

Max UV Index3.0 (Moderate)

WindNNE 5 mph

Tue 9/9

79° /61°
20%
Sunny to partly cloudy and humid

RealFeel®86°

RealFeel Shade™79°

Max UV Index5.0 (Moderate)

WindWNW 5 mph

Wed 9/10

78° /61°
61%
Humid with increasing cloudiness; a couple of showers and a thunderstorm in the afternoon

RealFeel®79°

RealFeel Shade™76°

Max UV Index5.0 (Moderate)

WindSSW 10 mph

Thu 9/11

79° /60°
20%
Mostly sunny and less humid

RealFeel®78°

RealFeel Shade™76°

Max UV Index5.0 (Moderate)

WindNNW 12 mph

Fri 9/12

79° /56°
40%
Partly sunny with a thunderstorm in spots in the afternoon

RealFeel®81°

RealFeel Shade™78°

Max UV Index5.0 (Moderate)

WindWNW 7 mph

Sat 9/13

73° /57°
1%
Mostly sunny and less humid

RealFeel®75°

RealFeel Shade™71°

Max UV Index5.0 (Moderate)

WindN 6 mph

Sun 9/14

69° /61°
57%
Mostly cloudy; a little morning rain followed by a shower in spots in the afternoon

RealFeel®67°

RealFeel Shade™67°

Max UV Index2.0 (Low)

WindENE 6 mph

Mon 9/15

69° /45°
59%
Showery in the morning; otherwise, mostly cloudy

RealFeel®67°

RealFeel Shade™67°

Max UV Index1.0 (Low)

WindWNW 15 mph

Tue 9/16

65° /48°
1%
Intervals of clouds and sunshine

RealFeel®64°

RealFeel Shade™64°

Max UV Index4.0 (Moderate)

WindWNW 12 mph

Wed 9/17

67° /49°
1%
Sunny much of the time

RealFeel®68°

RealFeel Shade™66°

Max UV Index5.0 (Moderate)

WindSW 7 mph

Thu 9/18

68° /52°
11%
Mostly cloudy

RealFeel®68°

RealFeel Shade™68°

Max UV Index2.0 (Low)

WindWSW 4 mph

Fri 9/19

73° /50°
57%
Partly sunny with a couple of showers in the afternoon

RealFeel®71°

RealFeel Shade™69°

Max UV Index5.0 (Moderate)

WindSSE 12 mph

Sat 9/20

68° /57°
1%
Partly sunny

RealFeel®68°

RealFeel Shade™67°

Max UV Index5.0 (Moderate)

WindW 9 mph

Sun 9/21

71° /47°
57%
Mostly cloudy with occasional rain in the afternoon

RealFeel®72°

RealFeel Shade™69°

Max UV Index5.0 (Moderate)

WindSSW 6 mph

Mon 9/22

78° /47°
0%
Mostly sunny

RealFeel®78°

RealFeel Shade™75°

Max UV Index5.0 (Moderate)

WindSW 7 mph

Tue 9/23

69° /57°
1%
Times of sun and clouds

RealFeel®68°

RealFeel Shade™67°

Max UV Index3.0 (Moderate)

WindN 10 mph

Wed 9/24

71° /49°
3%
Mostly sunny

RealFeel®70°

RealFeel Shade™68°

Max UV Index4.0 (Moderate)

WindE 10 mph

Thu 9/25

72° /44°
64%
Considerable cloudiness with a couple of showers and a thunderstorm, mainly later

RealFeel®70°

RealFeel Shade™70°

Max UV Index2.0 (Low)

WindSW 9 mph

Fri 9/26

64° /51°
0%
Plenty of sun

RealFeel®64°

RealFeel Shade™63°

Max UV Index4.0 (Moderate)

WindWNW 8 mph

Sat 9/27

70° /43°
0%
Plenty of sun

RealFeel®68°

RealFeel Shade™66°

Max UV Index4.0 (Moderate)

WindSW 12 mph

Sun 9/28

62° /52°
63%
Cooler with periods of rain

RealFeel®59°

RealFeel Shade™59°

Max UV Index1.0 (Low)

WindWSW 12 mph

Mon 9/29

63° /44°
1%
Sunny to partly cloudy

RealFeel®62°

RealFeel Shade™61°

Max UV Index4.0 (Moderate)

WindNNW 12 mph

Tue 9/30

64° /45°
1%
Mostly sunny

RealFeel®65°

RealFeel Shade™63°

Max UV Index4.0 (Moderate)

WindNNW 6 mph

Wed 10/1

68° /46°
0%
Plenty of sunshine

RealFeel®69°

RealFeel Shade™67°

Max UV Index4.0 (Moderate)

WindWNW 6 mph

Thu 10/2

71° /49°
0%
Plenty of sunshine

RealFeel®72°

RealFeel Shade™70°

Max UV Index4.0 (Moderate)

WindW 4 mph

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Hurricane

Hurricane Erin to unleash dangerous surf, rip currents along East Coas...

2 hours ago

Hurricane

Warnings issued as Outer Banks faces flooding, massive waves from Erin

39 minutes ago

Health

NYC Legionnaires’ disease cluster grows to more than 100 cases, includ...

1 day ago

Weather Forecasts

Cool sweep to erase heat, high humidity in Northeast

11 hours ago

Climate

The strange divide in how Americans experience summer temperatures

2 hours ago

 More Stories

Featured Stories

Astronomy

Goodbye long days: Where sunset is now happening before 8 pm

4 days ago

Weather News

Heavy rain in Pakistan, India-administered Kashmir and Nepal kills 400

1 day ago

Weather News

Police: Suspected suicide attempt was just trucker trying to cool off

1 day ago

Recreation

Atacama Desert bloom phenomenon to return in mid-September

2 hours ago

Weather News

US teen pilot accused of unauthorized Antarctic landing reaches deal

5 days ago
World North America Canada Ontario St. Catharines

Weather Near St. Catharines:

  • Brampton, Ontario
  • Mississauga Valley, Ontario
  • Toronto, Ontario
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect RealFeel® and RealFeel Shade™ Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect RealFeel® and RealFeel Shade™ Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2025 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information

...

...

...