St. Catharines Weather Conditions

Current Temperature Level

patchy rain possible
21°C
28°C20°C
Pleasant

Patchy rain nearby

Feels Like 21°C

Chances of Rain35%

Good

29AQI

Humidity

93%

Nowpatchy rain possible21°35%8 PMlight drizzle21°46%9 PMmoderate rain20°88%10 PMmoderate rain20°88%11 PMlight rain20°75%12 AMpatchy rain possible20°40%1 AMpatchy rain possible20°36%2 AMlight drizzle19°57%3 AMpatchy rain possible19°33%4 AMpatchy rain possible19°32%5 AMpartly cloudy19°15%6 AMovercast19°29%7 AMpartly cloudy18°19%8 AMpartly cloudy18°16%9 AMsunny19°11%10 AMsunny20°9%11 AMsunny21°7%12 PMsunny22°5%1 PMsunny22°4%2 PMsunny23°3%3 PMsunny24°2%4 PMsunny24°2%5 PMsunny24°2%6 PMsunny24°2%
.

Light rain may develop in some areas.

Last Updated: 2026-08-02 19:30 (Local Time)

St. Catharines Weather Parameters

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St. Catharines 10-Days Weather Forecast

See Monthly
Today2 Aug.


Patchy rain nearby

Patchy rain nearby

Occasional light rain is expected and humidity will be 91%, with winds at 24.5 km/h.


temperature icon

28°C  /  20°C

temperature iconHumi.91 %
temperature iconPrec.21.21 mm


Sunrise icon

Sunrise

06:08 AM

14hrs 29min

Sunset icon

Sunset

08:37 PM
Temperature (°C)
.
12 AMTime11 PM

Time

Condition

Temperature IconTemp

Humidity IconHumidity

UV IconUV

Wind IconWind Speed & Dir.

12 AM

ClearClear

23 °C

85 %

0

6.5 kmph /  NE

Feels Like IconFeels 26 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

1 AM

Patchy rain nearbyPatchy rain nearby

23 °C

86 %

0

7.2 kmph /  SSE

Feels Like IconFeels 25 °C

Temperature IconCover 84 %

Visibility IconVisibility 10 km

2 AM

Patchy rain nearbyPatchy rain nearby

22 °C

90 %

0

3.6 kmph /  SE

Feels Like IconFeels 25 °C

Temperature IconCover 89 %

Visibility IconVisibility 10 km

3 AM

ClearClear

22 °C

94 %

0

9.4 kmph /  N

Feels Like IconFeels 24 °C

Temperature IconCover 6 %

Visibility IconVisibility 2 km

4 AM

Patchy rain nearbyPatchy rain nearby

21 °C

92 %

0

13 kmph /  N

Feels Like IconFeels 23 °C

Temperature IconCover 88 %

Visibility IconVisibility 9 km

5 AM

ClearClear

21 °C

88 %

0

12.2 kmph /  NNE

Feels Like IconFeels 22 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

6 AM

ClearClear

21 °C

87 %

0

11.9 kmph /  ENE

Feels Like IconFeels 22 °C

Temperature IconCover 0 %

Visibility IconVisibility 10 km

7 AM

Patchy rain nearbyPatchy rain nearby

22 °C

90 %

0

13.7 kmph /  ENE

Feels Like IconFeels 23 °C

Temperature IconCover 86 %

Visibility IconVisibility 9 km

8 AM

Patchy rain nearbyPatchy rain nearby

22 °C

90 %

0.1

13 kmph /  ENE

Feels Like IconFeels 23 °C

Temperature IconCover 81 %

Visibility IconVisibility 10 km

9 AM

Light DrizzleLight Drizzle

22 °C

91 %

0.8

11.2 kmph /  E

Feels Like IconFeels 23 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

10 AM

Patchy rain nearbyPatchy rain nearby

22 °C

93 %

0.8

9.7 kmph /  ESE

Feels Like IconFeels 24 °C

Temperature IconCover 65 %

Visibility IconVisibility 10 km

11 AM

Light RainLight Rain

22 °C

91 %

1.3

9.7 kmph /  E

Feels Like IconFeels 25 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

12 PM

Light DrizzleLight Drizzle

22 °C

91 %

2.6

6.5 kmph /  E

Feels Like IconFeels 25 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

1 PM

Patchy rain nearbyPatchy rain nearby

28 °C

82 %

2.4

0.7 kmph /  NNW

Feels Like IconFeels 33 °C

Temperature IconCover 86 %

Visibility IconVisibility 10 km

2 PM

RainRain

22 °C

91 %

1

5.4 kmph /  NNW

Feels Like IconFeels 25 °C

Temperature IconCover 77 %

Visibility IconVisibility 10 km

3 PM

Patchy rain nearbyPatchy rain nearby

22 °C

94 %

2

9.7 kmph /  NNW

Feels Like IconFeels 24 °C

Temperature IconCover 78 %

Visibility IconVisibility 10 km

4 PM

OvercastOvercast

21 °C

96 %

3

12.6 kmph /  NNW

Feels Like IconFeels 23 °C

Temperature IconCover 94 %

Visibility IconVisibility 10 km

5 PM

RainRain

21 °C

96 %

1.5

19.1 kmph /  N

Feels Like IconFeels 21 °C

Temperature IconCover 86 %

Visibility IconVisibility 10 km

6 PM

Patchy rain nearbyPatchy rain nearby

21 °C

92 %

0.4

24.5 kmph /  NNE

Feels Like IconFeels 20 °C

Temperature IconCover 73 %

Visibility IconVisibility 10 km

7 PM

Patchy rain nearbyPatchy rain nearby

21 °C

93 %

0.1

21.6 kmph /  NNE

Feels Like IconFeels 21 °C

Temperature IconCover 100 %

Visibility IconVisibility 7 km

8 PM

Light DrizzleLight Drizzle

21 °C

93 %

0

23 kmph /  N

Feels Like IconFeels 20 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

9 PM

RainRain

20 °C

96 %

0

23.4 kmph /  N

Feels Like IconFeels 19 °C

Temperature IconCover 81 %

Visibility IconVisibility 10 km

10 PM

RainRain

20 °C

95 %

0

22.3 kmph /  N

Feels Like IconFeels 20 °C

Temperature IconCover 100 %

Visibility IconVisibility 9 km

11 PM

Light RainLight Rain

20 °C

94 %

0

23.4 kmph /  N

Feels Like IconFeels 19 °C

Temperature IconCover 100 %

Visibility IconVisibility 10 km

Temp21 °C


ConditionPatchy rain nearby


Humidity93 %

Feels21 °C


Cover100 %


Visibility7 km

Wind Speed & Dir.21.6 kmph /  NNE


UV0.1

St. Catharines 30-Days (August 2026) Weather Forecast

See Hourly
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny31°19°
2Today
Patchy rain nearby28°20°
3
Sunny24°18°
4
Sunny24°17°
5
Sunny26°19°
6
Patchy rain nearby28°21°
7
Patchy rain nearby24°20°
8
Sunny27°20°
9
Partly Cloudy26°20°
10
Rain Showers26°20°
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

5

Cloudy

Cloudy

1

Rainy

Rainy

25

Snowy

Snowy

0


The monthly weather averages in St. Catharines consist of 5 sunny days, 1 cloudy days, 25 rainy days, and 0 snowy days.

St. Catharines's Locations Weather Conditions


Locations
Temp
Condition
Humi.
UV
Wind Speed & Direction
21 °C
patchy rain possiblePatchy rain nearby
93%
0.1

21.6 kmph /  NNE

Canada's Hottest Cities - August 2026

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Last Updated: 03 Aug 2026, 12:04 AM

City Weather Rankings

FAQs About St. Catharines Weather Conditions


1. What is the current temperature in St. Catharines today - 02 August 2026?

The current temperature in St. Catharines is 21°C, with a feels-like temperature of 21°C. Today's forecast shows a high of 28°C and a low of 20°C, giving a 8 degree swing through the day as of 07:30 PM 02 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 07:30 PM 02 August 2026: Condition : Patchy rain nearby Temperature : 21°C Pleasant (Feels like 21°C) Humidity : 93% Wind Speed : 21.6 km/h from NNE (15 degrees), Gust 10.1 m/s UV Index : 0.1 (Low Air Pressure : 1006 mb Cloud Cover : 100% Visibility : 7 km Precipitation : 0.02 mm (88% chance of rain)

3. What is the 10-day weather forecast for St. Catharines from 07:30 PM 02 August 2026?

From 07:30 PM 02 August 2026, St. Catharines's 10-day forecast shows this trend: Today (Aug. 2) : Temp. 22°C, Hum. 91% and Patchy rain nearby condition. Monday (Aug. 3) : Temp. 21°C, Hum. 73% and Sunny condition. Tuesday (Aug. 4) : Temp. 20°C, Hum. 64% and Sunny condition. Wednesday (Aug. 5) : Temp. 22°C, Hum. 79% and Sunny condition. Thursday (Aug. 6) : Temp. 24°C, Hum. 81% and Sunny condition. Friday (Aug. 7) : Temp. 23°C, Hum. 89% and Patchy rain nearby condition. Saturday (Aug. 8) : Temp. 23°C, Hum. 87% and Sunny condition. Sunday (Aug. 9) : Temp. 22°C, Hum. 73% and Sunny condition. Monday (Aug. 10) : Temp. 23°C, Hum. 74% and Rain Showers condition. Tuesday (Aug. 11) : Temp. 22°C, Hum. 73% and Rain Showers condition.

4. Will it rain in St. Catharines today?

As of 07:30 PM 02 August 2026, yes — St. Catharines is currently experiencing rainfall with 0.02 mm of precipitation. This is expected to temporarily improve AQI by washing pollutants out of the atmosphere.

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

August 2026 in St. Catharines is forecast to have 5 sunny days, 25 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.