St Catharines Weather Conditions

Current Temperature Level

sunny
27°C
28°C17°C
Pleasant

Sunny

Feels Like 28°C

Chances of Rain2%

Good

18AQI

Humidity

50%

Nowsunny27°2%7 PMsunny26°2%8 PMsunny21°4%9 PMclear19°7%10 PMclear19°5%11 PMclear19°4%12 AMclear18°3%1 AMclear17°4%2 AMclear16°7%3 AMclear16°9%4 AMclear15°9%5 AMclear15°9%6 AMclear15°8%7 AMsunny17°8%8 AMsunny18°7%9 AMsunny20°7%10 AMsunny21°6%11 AMsunny22°5%12 PMsunny22°4%1 PMsunny23°3%2 PMsunny24°3%3 PMsunny24°3%4 PMsunny24°3%5 PMsunny25°3%
.

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

Last Updated: 2026-08-03 18:30 (Local Time)

St Catharines Weather Parameters

Get AQI App

St Catharines 10-Days Weather Forecast

See Monthly
Today3 Aug.


Sunny

Sunny

Clear Sky with temperature at 21 °C and humidity will be at 73% with 25.6 km/h winds.


temperature icon

28°C  /  17°C

temperature iconHumi.73 %
temperature iconPrec.1.32 mm


Sunrise icon

Sunrise

06:09 AM

14hrs 27min

Sunset icon

Sunset

08:36 PM
Temperature (°C)
.
12 AMTime11 PM

Time

Condition

Temperature IconTemp

Humidity IconHumidity

UV IconUV

Wind IconWind Speed & Dir.

12 AM

Patchy rain nearbyPatchy rain nearby

19 °C

94 %

0

21.6 kmph /  N

Feels Like IconFeels 17 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

1 AM

OvercastOvercast

18 °C

88 %

0

19.1 kmph /  NNW

Feels Like IconFeels 17 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

2 AM

Light RainLight Rain

18 °C

91 %

0

19.4 kmph /  NNW

Feels Like IconFeels 17 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

3 AM

Patchy rain nearbyPatchy rain nearby

18 °C

84 %

0

18.4 kmph /  NW

Feels Like IconFeels 16 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

4 AM

OvercastOvercast

18 °C

85 %

0

23.4 kmph /  NW

Feels Like IconFeels 15 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

5 AM

Patchy rain nearbyPatchy rain nearby

18 °C

86 %

0

24.1 kmph /  NW

Feels Like IconFeels 15 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

6 AM

Patchy rain nearbyPatchy rain nearby

18 °C

85 %

0

25.6 kmph /  NW

Feels Like IconFeels 14 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

7 AM

Patchy rain nearbyPatchy rain nearby

17 °C

92 %

0.2

24.5 kmph /  NW

Feels Like IconFeels 15 °C

Temperature IconCover 70 %

Visibility IconVisibility 2 km

8 AM

Patchy rain nearbyPatchy rain nearby

18 °C

84 %

0.7

22.7 kmph /  WNW

Feels Like IconFeels 16 °C

Temperature IconCover 87 %

Visibility IconVisibility 10 km

9 AM

SunnySunny

19 °C

82 %

1.9

22.3 kmph /  WNW

Feels Like IconFeels 17 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

10 AM

SunnySunny

20 °C

79 %

3.5

21.2 kmph /  NW

Feels Like IconFeels 18 °C

Temperature IconCover 3 %

Visibility IconVisibility 10 km

11 AM

SunnySunny

23 °C

75 %

5.2

15.8 kmph /  NW

Feels Like IconFeels 23 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

12 PM

SunnySunny

24 °C

69 %

6.7

13 kmph /  NW

Feels Like IconFeels 25 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

1 PM

SunnySunny

26 °C

64 %

7.4

11.9 kmph /  WNW

Feels Like IconFeels 27 °C

Temperature IconCover 2 %

Visibility IconVisibility 10 km

2 PM

SunnySunny

27 °C

61 %

7.3

11.5 kmph /  WNW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

3 PM

SunnySunny

27 °C

58 %

6.3

10.8 kmph /  WNW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

4 PM

SunnySunny

27 °C

54 %

4.6

9.4 kmph /  WNW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

5 PM

SunnySunny

28 °C

51 %

2.8

7.6 kmph /  WNW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

6 PM

SunnySunny

27 °C

50 %

1.3

6.1 kmph /  NW

Feels Like IconFeels 28 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

7 PM

SunnySunny

26 °C

54 %

0.4

5.4 kmph /  N

Feels Like IconFeels 27 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

8 PM

SunnySunny

21 °C

66 %

0

4.7 kmph /  NNW

Feels Like IconFeels 21 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

9 PM

ClearClear

19 °C

74 %

0

2.9 kmph /  WNW

Feels Like IconFeels 20 °C

Temperature IconCover 1 %

Visibility IconVisibility 10 km

10 PM

ClearClear

19 °C

67 %

0

2.9 kmph /  W

Feels Like IconFeels 19 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

11 PM

ClearClear

19 °C

62 %

0

4 kmph /  WSW

Feels Like IconFeels 18 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

Temp27 °C


ConditionSunny


Humidity50 %

Feels28 °C


Cover0 %


Visibility10 km

Wind Speed & Dir.6.1 kmph /  NW


UV1.3

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°
3Today
Sunny27°18°
4
Sunny24°17°
5
Partly Cloudy27°20°
6
Patchy rain nearby28°21°
7
Sunny24°19°
8
Patchy rain nearby26°21°
9
Sunny24°19°
10
Sunny26°18°
11
Rain Showers26°19°
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

6

Cloudy

Cloudy

1

Rainy

Rainy

24

Snowy

Snowy

0


The monthly weather averages in St Catharines consist of 6 sunny days, 1 cloudy days, 24 rainy days, and 0 snowy days.

St Catharines's Locations Weather Conditions


Locations
Temp
Condition
Humi.
UV
Wind Speed & Direction
27 °C
sunnySunny
50%
1.3

6.1 kmph /  NW

Canada's Hottest Cities - August 2026

Hottest
Coldest

Last Updated: 03 Aug 2026, 10:47 PM

City Weather Rankings

FAQs About St Catharines Weather Conditions


1. What is the current temperature in St Catharines today - 03 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 28°C and a low of 17°C, giving a 11 degree swing through the day as of 06:30 PM 03 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 06:30 PM 03 August 2026: Condition : Sunny Temperature : 27°C Pleasant (Feels like 28°C) Humidity : 50% Wind Speed : 6.1 km/h from NW (323 degrees), Gust 3.1 m/s UV Index : 1.3 (Low Air Pressure : 1013 mb Cloud Cover : 0% Visibility : 10 km Precipitation : 0 mm (57% chance of rain)

3. What is the 10-day weather forecast for St Catharines from 06:30 PM 03 August 2026?

From 06:30 PM 03 August 2026, St Catharines's 10-day forecast shows this trend: Today (Aug. 3) : Temp. 21°C, Hum. 73% and Sunny condition. Tuesday (Aug. 4) : Temp. 20°C, Hum. 67% and Sunny condition. Wednesday (Aug. 5) : Temp. 22°C, Hum. 71% and Sunny condition. Thursday (Aug. 6) : Temp. 23°C, Hum. 76% and Sunny condition. Friday (Aug. 7) : Temp. 23°C, Hum. 79% and Patchy rain nearby condition. Saturday (Aug. 8) : Temp. 23°C, Hum. 77% and Sunny condition. Sunday (Aug. 9) : Temp. 25°C, Hum. 74% and Sunny condition. Monday (Aug. 10) : Temp. 21°C, Hum. 66% and Sunny condition. Tuesday (Aug. 11) : Temp. 22°C, Hum. 73% and Rain Showers condition. Wednesday (Aug. 12) : Temp. 22°C, Hum. 74% and Rain Showers condition.

4. Will it rain in St Catharines today?

As of 06:30 PM 03 August 2026, there is a 2% chance of rainfall in St Catharines later today around 2026-08-03 19:00. 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 6 sunny days, 24 rainy days, 1 cloudy days, and 0 snowy days. Temperatures for the month range from lows around 17°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.