St. Catharines, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in St. Catharines is High, with a 4.8% 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 Aug. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (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 -0.3%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
3516
-54.2%
cloudyCloudy
5945
-23.7%
rainyRainy
10280
-21.5%
snowySnowy
89
12.5%
mistyMisty
011
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

-0.03 °C

Variation in annual rainfall

+40.3 %

Change in average humidity

+1.3 %

PM2.5 levels surged by

-14.3 %

Heatwave changed by

-4.4 day(s)

Coldwave changed by

-4.9 day(s)

Wind speeds changed by

+3.5 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 Aug.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 24, Sep.
sunnySunny
Temperature Icon27°/16°
Humidity Icon83%
Wind Icon16km/h
Thu. 25, Sep.
moderate rainModerate rain
Temperature Icon23°/18°
Humidity Icon83%
Wind Icon13km/h
Fri. 26, Sep.
cloudyCloudy
Temperature Icon25°/17°
Humidity Icon79%
Wind Icon19km/h
Sat. 27, Sep.
sunnySunny
Temperature Icon23°/16°
Humidity Icon75%
Wind Icon13km/h
Sun. 28, Sep.
sunnySunny
Temperature Icon24°/17°
Humidity Icon75%
Wind Icon15km/h
Mon. 29, Sep.
sunnySunny
Temperature Icon23°/18°
Humidity Icon67%
Wind Icon11km/h
Tue. 30, Sep.
sunnySunny
Temperature Icon19°/15°
Humidity Icon59%
Wind Icon32km/h
Wed. 1, Oct.
sunnySunny
Temperature Icon15°/11°
Humidity Icon57%
Wind Icon28km/h
Thu. 2, Oct.
sunnySunny
Temperature Icon19°/10°
Humidity Icon55%
Wind Icon27km/h
Fri. 3, Oct.
sunnySunny
Temperature Icon23°/16°
Humidity Icon64%
Wind Icon24km/h
Sat. 4, Oct.
sunnySunny
Temperature Icon23°/18°
Humidity Icon69%
Wind Icon16km/h
Sun. 5, Oct.
partly cloudyPartly Cloudy
Temperature Icon23°/17°
Humidity Icon66%
Wind Icon17km/h
Mon. 6, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon18°/16°
Humidity Icon87%
Wind Icon13km/h
Tue. 7, Oct.
sunnySunny
Temperature Icon17°/14°
Humidity Icon75%
Wind Icon18km/h
Wed. 8, Oct.
moderate rain at timesModerate rain at times
Temperature Icon17°/11°
Humidity Icon71%
Wind Icon25km/h
Thu. 9, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/12°
Humidity Icon71%
Wind Icon24km/h
Fri. 10, Oct.
moderate rain at timesModerate rain at times
Temperature Icon17°/12°
Humidity Icon70%
Wind Icon22km/h
Sat. 11, Oct.
moderate rain at timesModerate rain at times
Temperature Icon17°/10°
Humidity Icon69%
Wind Icon25km/h
Sun. 12, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon16°/10°
Humidity Icon70%
Wind Icon25km/h
Mon. 13, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon16°/10°
Humidity Icon74%
Wind Icon23km/h
Tue. 14, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon15°/10°
Humidity Icon74%
Wind Icon24km/h
Wed. 15, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon16°/9°
Humidity Icon73%
Wind Icon32km/h
Thu. 16, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/9°
Humidity Icon73%
Wind Icon28km/h
Fri. 17, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon14°/8°
Humidity Icon70%
Wind Icon27km/h
Sat. 18, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon14°/8°
Humidity Icon69%
Wind Icon26km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/8°
Humidity Icon73%
Wind Icon28km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/10°
Humidity Icon75%
Wind Icon29km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon15°/10°
Humidity Icon75%
Wind Icon28km/h
Wed. 22, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/8°
Humidity Icon72%
Wind Icon27km/h
Thu. 23, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/9°
Humidity Icon74%
Wind Icon26km/h
Fri. 24, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/8°
Humidity Icon73%
Wind Icon25km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 24, Sep.

26.9°C

Low will be onSat. 18, Oct.

7.6°C

HumidityHumidity

High will be onMon. 6, Oct.

87%

Low will be onThu. 2, Oct.

55%

Wind SpeedWind Speed

High will be onTue. 30, Sep.

31.7km/h

Low will be onMon. 29, Sep.

10.8km/h

PrecipitationPrecipitation

High will be onThu. 25, Sep.

8.9mm

Low will be onTue. 7, Oct.

0.01mm

Ultraviolet IndexUV

High will be onSat. 4, Oct.

6

Low will be onWed. 8, Oct.

3

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