St Catharines, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in St Catharines is High, with a -3.6% improvement in the climate score compared to last 15 years. This suggests improved conditions, with more favorable environmental indicators and a reduction in negative impacts.
Data: Jan. to Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

St Catharines Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), St Catharines temperature has changed by around -0.2%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
2711
-59.2%
cloudyCloudy
5133
-35.2%
rainyRainy
8879
-10.2%
snowySnowy
89
12.5%
mistyMisty
07
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 15 years, St Catharines has experienced measurable shifts in key climate parameters, contributing to the current severity score of 48 (within the High severity category). While the score remains High, certain factors have improved over time. Here’s a breakdown of the specific changes observed:

Severity Score

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, St Catharines experienced significant changes:

Temperature change of

-0.01 °C

Variation in annual rainfall

+42.01 %

Change in average humidity

+1.8 %

PM2.5 levels surged by

-24.1 %

Heatwave changed by

-3.2 day(s)

Coldwave changed by

-4.5 day(s)

Wind speeds changed by

+3.3 km/h

These indicators show improvement in key parametes of climate, but St Catharines remains in the High severity category. Continuous focus on climate resilience is necessary to avoid further worsening and ensure sustainability.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

St Catharines Weather Forecast 30 Days (August - September 2025)
St Catharines, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 9, Aug.
partly cloudyPartly Cloudy
Temperature Icon32°/22°
Humidity Icon65%
Wind Icon18km/h
Sun. 10, Aug.
cloudyCloudy
Temperature Icon31°/22°
Humidity Icon66%
Wind Icon14km/h
Mon. 11, Aug.
partly cloudyPartly Cloudy
Temperature Icon32°/22°
Humidity Icon66%
Wind Icon20km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon33°/23°
Humidity Icon59%
Wind Icon25km/h
Wed. 13, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon30°/23°
Humidity Icon69%
Wind Icon37km/h
Thu. 14, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon25°/23°
Humidity Icon87%
Wind Icon24km/h
Fri. 15, Aug.
partly cloudyPartly Cloudy
Temperature Icon29°/23°
Humidity Icon77%
Wind Icon17km/h
Sat. 16, Aug.
sunnySunny
Temperature Icon26°/22°
Humidity Icon63%
Wind Icon19km/h
Sun. 17, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon29°/22°
Humidity Icon58%
Wind Icon13km/h
Mon. 18, Aug.
sunnySunny
Temperature Icon33°/24°
Humidity Icon66%
Wind Icon24km/h
Tue. 19, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon32°/24°
Humidity Icon71%
Wind Icon26km/h
Wed. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/23°
Humidity Icon91%
Wind Icon21km/h
Thu. 21, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon26°/22°
Humidity Icon86%
Wind Icon21km/h
Fri. 22, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon26°/21°
Humidity Icon81%
Wind Icon16km/h
Sat. 23, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon24°/18°
Humidity Icon73%
Wind Icon18km/h
Sun. 24, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon25°/18°
Humidity Icon71%
Wind Icon18km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/19°
Humidity Icon74%
Wind Icon19km/h
Tue. 26, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon24°/18°
Humidity Icon76%
Wind Icon18km/h
Wed. 27, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/18°
Humidity Icon76%
Wind Icon20km/h
Thu. 28, Aug.
moderate rain at timesModerate rain at times
Temperature Icon25°/18°
Humidity Icon75%
Wind Icon20km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/18°
Humidity Icon74%
Wind Icon19km/h
Sat. 30, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/18°
Humidity Icon74%
Wind Icon22km/h
Sun. 31, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/18°
Humidity Icon72%
Wind Icon19km/h
Mon. 1, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon24°/18°
Humidity Icon71%
Wind Icon18km/h
Tue. 2, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/18°
Humidity Icon73%
Wind Icon20km/h
Wed. 3, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/19°
Humidity Icon74%
Wind Icon19km/h
Thu. 4, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/18°
Humidity Icon74%
Wind Icon22km/h
Fri. 5, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/17°
Humidity Icon73%
Wind Icon20km/h
Sat. 6, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon24°/17°
Humidity Icon71%
Wind Icon18km/h
Sun. 7, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/18°
Humidity Icon74%
Wind Icon23km/h
Mon. 8, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/17°
Humidity Icon74%
Wind Icon24km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 12, Aug.

32.9°C

Low will be onMon. 8, Sep.

16.5°C

HumidityHumidity

High will be onWed. 20, Aug.

91%

Low will be onSun. 17, Aug.

58%

Wind SpeedWind Speed

High will be onWed. 13, Aug.

36.7km/h

Low will be onSun. 17, Aug.

13km/h

PrecipitationPrecipitation

High will be onThu. 4, Sep.

4.7mm

Low will be onFri. 15, Aug.

0.02mm

Ultraviolet IndexUV

High will be onFri. 15, Aug.

7

Low will be onTue. 12, Aug.

0.1

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