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St. Catharines, Ontario

91°F
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St. Catharines

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St. Catharines, Ontario Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Hourly

 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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6 PM

90°
RealFeel® 95°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 55%
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Thunderstorms
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday
alerts

Yellow Watch - Severe Thunderstorm

4:55 PM Wednesday - 10:00 PM Wednesday

RealFeel Shade™95°

Heat Index101°

WindSW 13 mph

Air QualityPoor

Max UV Index0.6 (Low)

Wind Gusts28 mph

Humidity64%

Indoor Humidity64% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover100%

Rain0.01 in

Visibility10 mi

Cloud Ceiling9000 ft

7 PM

87°
RealFeel® 91°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 61%
Chevron down
Thunderstorms
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday
alerts

Yellow Watch - Severe Thunderstorm

4:55 PM Wednesday - 10:00 PM Wednesday

RealFeel Shade™91°

Heat Index97°

WindSW 12 mph

Air QualityPoor

Max UV Index0.5 (Low)

Wind Gusts25 mph

Humidity69%

Indoor Humidity69% (Extremely Humid)

Dew Point76° F

AccuLumen Brightness Index™4 (Dull)

Cloud Cover81%

Rain0.05 in

Visibility10 mi

Cloud Ceiling9000 ft

8 PM

84°
RealFeel® 89°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 49%
Chevron down
Mostly sunny
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday
alerts

Yellow Watch - Severe Thunderstorm

4:55 PM Wednesday - 10:00 PM Wednesday

RealFeel Shade™89°

Heat Index91°

WindSW 12 mph

Air QualityPoor

Max UV Index0.5 (Low)

Wind Gusts24 mph

Humidity73%

Indoor Humidity73% (Extremely Humid)

Dew Point74° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover26%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

81°
RealFeel® 84°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 56%
Chevron down
Partly sunny w/ t-storms
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday
alerts

Yellow Watch - Severe Thunderstorm

4:55 PM Wednesday - 10:00 PM Wednesday

RealFeel Shade™84°

Heat Index87°

WindSW 10 mph

Air QualityPoor

Max UV Index0.0 (Low)

Wind Gusts21 mph

Humidity82%

Indoor Humidity82% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover26%

Rain0.15 in

Visibility4 mi

Cloud Ceiling30000 ft

10 PM

79°
RealFeel® 83°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 49%
Chevron down
Mostly clear
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday

Heat Index80°

WindSSW 10 mph

Air QualityPoor

Wind Gusts17 mph

Humidity83%

Indoor Humidity83% (Extremely Humid)

Dew Point73° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover26%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

77°
RealFeel® 81°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 34%
Chevron down
Mostly clear
alerts

Orange Warning - Heat

4:47 PM Wednesday - 12:00 AM Sunday

WindSSW 9 mph

Air QualityPoor

Wind Gusts14 mph

Humidity85%

Indoor Humidity85% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover26%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for St. Catharines

AccuWeather's hourly forecast for St. Catharines provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 90° with a RealFeel® of 95°, thunderstorms with a 55% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

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Weather Near St. Catharines:

  • Brampton, Ontario
  • Mississauga Valley, Ontario
  • Toronto, Ontario
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