St Catharines Weather Conditions

Current Temperature Level

sunny
27°C
29°C15°C
Pleasant

Sunny

Feels Like 28°C

Chances of Rain1%

Good

17AQI

Humidity

48%

Nowsunny27°1%7 PMsunny26°2%8 PMsunny23°7%9 PMclear21°8%10 PMclear21°8%11 PMclear20°7%12 AMclear20°5%1 AMclear19°7%2 AMclear19°7%3 AMclear18°8%4 AMclear17°8%5 AMclear17°8%6 AMclear17°8%7 AMsunny18°9%8 AMsunny20°7%9 AMsunny21°6%10 AMsunny22°5%11 AMsunny23°4%12 PMsunny24°4%1 PMsunny24°4%2 PMsunny24°4%3 PMsunny25°5%4 PMsunny25°5%5 PMsunny25°5%
.

It is likely to be sunny; sun protection may help.

Last Updated: 2026-08-04 18:00 (Local Time)

St Catharines Weather Parameters

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St Catharines 10-Days Weather Forecast

See Monthly
Today4 Aug.


Sunny

Sunny

Clear Sky with temperature at 22 °C and humidity will be at 73% with 10.1 km/h winds.


temperature icon

29°C  /  15°C

temperature iconHumi.73 %
temperature iconPrec.0 mm


Sunrise icon

Sunrise

06:10 AM

14hrs 25min

Sunset icon

Sunset

08:35 PM
Temperature (°C)
.
12 AMTime11 PM

Time

Condition

Temperature IconTemp

Humidity IconHumidity

UV IconUV

Wind IconWind Speed & Dir.

12 AM

ClearClear

19 °C

81 %

0

6.5 kmph /  W

Feels Like IconFeels 19 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

1 AM

ClearClear

18 °C

83 %

0

5.8 kmph /  W

Feels Like IconFeels 19 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

2 AM

ClearClear

18 °C

87 %

0

5 kmph /  W

Feels Like IconFeels 18 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

3 AM

ClearClear

17 °C

88 %

0

5.4 kmph /  SW

Feels Like IconFeels 18 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

4 AM

ClearClear

17 °C

87 %

0

7.9 kmph /  SSW

Feels Like IconFeels 17 °C

Temperature IconCover 3 %

Visibility IconVisibility 10 km

5 AM

ClearClear

17 °C

84 %

0

6.1 kmph /  SW

Feels Like IconFeels 17 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

6 AM

ClearClear

16 °C

87 %

0

7.6 kmph /  SSW

Feels Like IconFeels 16 °C

Temperature IconCover 3 %

Visibility IconVisibility 10 km

7 AM

SunnySunny

15 °C

82 %

0.2

8.6 kmph /  SSW

Feels Like IconFeels 14 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

8 AM

CloudyCloudy

17 °C

83 %

0.8

8.3 kmph /  SW

Feels Like IconFeels 17 °C

Temperature IconCover 70 %

Visibility IconVisibility 10 km

9 AM

CloudyCloudy

19 °C

80 %

2

9.7 kmph /  WSW

Feels Like IconFeels 19 °C

Temperature IconCover 76 %

Visibility IconVisibility 10 km

10 AM

Partly CloudyPartly Cloudy

21 °C

83 %

3.8

10.1 kmph /  WSW

Feels Like IconFeels 22 °C

Temperature IconCover 26 %

Visibility IconVisibility 10 km

11 AM

SunnySunny

23 °C

78 %

5.8

9.7 kmph /  W

Feels Like IconFeels 25 °C

Temperature IconCover 9 %

Visibility IconVisibility 10 km

12 PM

SunnySunny

26 °C

68 %

7.5

9.4 kmph /  W

Feels Like IconFeels 27 °C

Temperature IconCover 2 %

Visibility IconVisibility 10 km

1 PM

SunnySunny

27 °C

64 %

8.3

7.2 kmph /  W

Feels Like IconFeels 29 °C

Temperature IconCover 2 %

Visibility IconVisibility 10 km

2 PM

SunnySunny

29 °C

56 %

8.1

5.4 kmph /  W

Feels Like IconFeels 30 °C

Temperature IconCover 3 %

Visibility IconVisibility 10 km

3 PM

SunnySunny

28 °C

54 %

6.8

3.2 kmph /  W

Feels Like IconFeels 29 °C

Temperature IconCover 1 %

Visibility IconVisibility 10 km

4 PM

SunnySunny

28 °C

55 %

4.9

4 kmph /  SSW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

5 PM

SunnySunny

27 °C

58 %

3

6.5 kmph /  SSW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

6 PM

SunnySunny

27 °C

48 %

1.4

6.5 kmph /  SSW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

7 PM

SunnySunny

26 °C

54 %

0.5

5.8 kmph /  SW

Feels Like IconFeels 27 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

8 PM

SunnySunny

23 °C

74 %

0

5.4 kmph /  SW

Feels Like IconFeels 25 °C

Temperature IconCover 1 %

Visibility IconVisibility 10 km

9 PM

ClearClear

21 °C

77 %

0

4.3 kmph /  SSW

Feels Like IconFeels 23 °C

Temperature IconCover 2 %

Visibility IconVisibility 10 km

10 PM

ClearClear

21 °C

77 %

0

4.7 kmph /  S

Feels Like IconFeels 22 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

11 PM

ClearClear

20 °C

75 %

0

4.7 kmph /  SSE

Feels Like IconFeels 21 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

Temp27 °C


ConditionSunny


Humidity48 %

Feels28 °C


Cover0 %


Visibility10 km

Wind Speed & Dir.6.5 kmph /  SSW


UV1.4

St Catharines 30-Days (August 2026) Weather Forecast

See Hourly
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny31°19°
2
Patchy rain nearby28°19°
3
Sunny28°17°
4Today
Sunny29°16°
5
Sunny25°18°
6
Sunny29°21°
7
Patchy rain nearby24°20°
8
Sunny26°20°
9
Sunny29°21°
10
Sunny25°19°
11
Sunny21°17°
12
Rain Showers26°19°
13
Rain Showers25°19°
14
Heavy Rain25°19°
15
Rain Showers25°19°
16
Rain Showers26°19°
17
Rain Showers26°19°
18
Rain Showers25°19°
19
Rain25°18°
20
Rain Showers25°19°
21
Rain Showers25°19°
22
Rain Showers24°18°
23
Heavy Rain24°18°
24
Rain Showers25°18°
25
Rain Showers25°19°
26
Heavy Rain24°18°
27
Rain Showers24°18°
28
Rain Showers24°18°
29
Rain Showers25°18°
30
Rain Showers24°18°
31
Rain Showers24°18°

AugustWeather Overview

No. of days:

Sunny

Sunny

9

Cloudy

Cloudy

0

Rainy

Rainy

22

Snowy

Snowy

0


The monthly weather averages in St Catharines consist of 9 sunny days, 0 cloudy days, 22 rainy days, and 0 snowy days.

St Catharines's Locations Weather Conditions


Locations
Temp
Condition
Humi.
UV
Wind Speed & Direction
27 °C
sunnySunny
48%
1.4

6.5 kmph /  SSW

Canada's Hottest Cities - August 2026

Hottest
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Last Updated: 04 Aug 2026, 10:18 PM

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FAQs About St Catharines Weather Conditions


1. What is the current temperature in St Catharines today - 04 August 2026?

The current temperature in St Catharines is 27°C, with a feels-like temperature of 28°C. Today's forecast shows a high of 29°C and a low of 15°C, giving a 14 degree swing through the day as of 06:00 PM 04 August 2026.

2. What are the current weather parameters in St Catharines today?

Here is a complete overview of St Catharines's current weather conditions as of 06:00 PM 04 August 2026: Condition : Sunny Temperature : 27°C Pleasant (Feels like 28°C) Humidity : 48% Wind Speed : 6.5 km/h from SSW (207 degrees), Gust 2.9 m/s UV Index : 1.4 (Low Air Pressure : 1017 mb Cloud Cover : 0% Visibility : 10 km Precipitation : 0 mm (7% chance of rain)

3. What is the 10-day weather forecast for St Catharines from 06:00 PM 04 August 2026?

From 06:00 PM 04 August 2026, St Catharines's 10-day forecast shows this trend: Today (Aug. 4) : Temp. 22°C, Hum. 73% and Sunny condition. Wednesday (Aug. 5) : Temp. 22°C, Hum. 71% and Sunny condition. Thursday (Aug. 6) : Temp. 23°C, Hum. 80% and Partly Cloudy condition. Friday (Aug. 7) : Temp. 22°C, Hum. 85% and Sunny condition. Saturday (Aug. 8) : Temp. 23°C, Hum. 82% and Sunny condition. Sunday (Aug. 9) : Temp. 22°C, Hum. 90% and Patchy rain nearby condition. Monday (Aug. 10) : Temp. 23°C, Hum. 85% and Sunny condition. Tuesday (Aug. 11) : Temp. 21°C, Hum. 88% and Rain Shower condition. Wednesday (Aug. 12) : Temp. 22°C, Hum. 74% and Rain Showers condition. Thursday (Aug. 13) : Temp. 22°C, Hum. 73% and Rain Showers condition.

4. Will it rain in St Catharines today?

As of 06:00 PM 04 August 2026, there is a 1% chance of rainfall in St Catharines later today around 2026-08-04 18:00. Current precipitation is 0 mm. Residents are advised to carry an umbrella before heading out.

5. What is the monthly weather forecast for St Catharines in August 2026?

August 2026 in St Catharines is forecast to have 9 sunny days, 22 rainy days, 0 cloudy days, and 0 snowy days. Temperatures for the month range from lows around 16°C to highs of 31°C.

6. How does the weather in St Catharines affect air quality?

Weather directly impacts air quality in St Catharines. Calm winds, high humidity, fog, and high pressure trap pollutants near the ground, worsening AQI. Strong winds, rainfall, and low pressure help disperse them. Rising temperatures and UV levels intensify ozone and smog formation, while poor visibility signals elevated particulate matter. Monitoring weather alongside AQI gives the clearest picture of outdoor safety.