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St. Catharines, Ontario

91°F
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St. Catharines

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91°
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St. Catharines, Ontario Weather
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Winter Center
Today

Hourly

 Daily Radar MinuteCast Monthly Air Quality Health & Activities

4 PM

94°
RealFeel® 98°
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.
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Intermittent clouds
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

RealFeel Shade™95°

WindSW 12 mph

Air QualityPoor

Max UV Index4 (Moderate)

Wind Gusts20 mph

Humidity44%

Indoor Humidity44% (Very Humid)

Dew Point69° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover62%

Visibility10 mi

Cloud Ceiling20000 ft

5 PM

93°
RealFeel® 98°
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 0%
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Intermittent clouds
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

RealFeel Shade™95°

WindSSW 10 mph

Air QualityPoor

Max UV Index3 (Moderate)

Wind Gusts20 mph

Humidity47%

Indoor Humidity47% (Very Humid)

Dew Point70° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover54%

Visibility10 mi

Cloud Ceiling20000 ft

6 PM

91°
RealFeel® 96°
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
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Partly sunny
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

RealFeel Shade™94°

WindSSW 10 mph

Air QualityPoor

Max UV Index2 (Low)

Wind Gusts17 mph

Humidity50%

Indoor Humidity50% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover33%

Visibility10 mi

Cloud Ceiling30000 ft

7 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 0%
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Mostly sunny
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

RealFeel Shade™93°

WindSSW 8 mph

Air QualityPoor

Max UV Index1 (Low)

Wind Gusts15 mph

Humidity55%

Indoor Humidity55% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover26%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

90°
RealFeel® 94°
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 1%
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Sunny
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

RealFeel Shade™94°

WindS 8 mph

Air QualityPoor

Max UV Index0 (Low)

Wind Gusts13 mph

Humidity55%

Indoor Humidity55% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™3 (Dull)

Cloud Cover7%

Visibility10 mi

Cloud Ceiling30000 ft

9 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
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Clear
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

WindS 8 mph

Air QualityPoor

Wind Gusts14 mph

Humidity61%

Indoor Humidity61% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover6%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

84°
RealFeel® 88°
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
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Clear
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

WindS 8 mph

Air QualityFair

Wind Gusts14 mph

Humidity66%

Indoor Humidity66% (Extremely Humid)

Dew Point72° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover6%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

82°
RealFeel® 86°
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 0%
Chevron down
Clear
alerts

Heat Warning

10:28 AM Saturday - 6:00 AM Friday

WindS 8 mph

Air QualityFair

Wind Gusts14 mph

Humidity70%

Indoor Humidity70% (Very Humid)

Dew Point71° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover5%

Visibility10 mi

Cloud Ceiling30000 ft

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World North America Canada Ontario St. Catharines

Weather Near St. Catharines:

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