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
Tue. 30, Sep.
sunnySunny
Temperature Icon23°/12°
Humidity Icon65%
Wind Icon30km/h
Wed. 1, Oct.
partly cloudyPartly Cloudy
Temperature Icon17°/10°
Humidity Icon70%
Wind Icon30km/h
Thu. 2, Oct.
partly cloudyPartly Cloudy
Temperature Icon21°/7°
Humidity Icon61%
Wind Icon21km/h
Fri. 3, Oct.
sunnySunny
Temperature Icon21°/14°
Humidity Icon61%
Wind Icon14km/h
Sat. 4, Oct.
sunnySunny
Temperature Icon24°/16°
Humidity Icon75%
Wind Icon19km/h
Sun. 5, Oct.
sunnySunny
Temperature Icon25°/17°
Humidity Icon63%
Wind Icon14km/h
Mon. 6, Oct.
partly cloudyPartly Cloudy
Temperature Icon25°/18°
Humidity Icon61%
Wind Icon24km/h
Tue. 7, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon22°/18°
Humidity Icon79%
Wind Icon19km/h
Wed. 8, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon16°/16°
Humidity Icon89%
Wind Icon18km/h
Thu. 9, Oct.
partly cloudyPartly Cloudy
Temperature Icon19°/15°
Humidity Icon71%
Wind Icon22km/h
Fri. 10, Oct.
sunnySunny
Temperature Icon24°/16°
Humidity Icon73%
Wind Icon36km/h
Sat. 11, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/16°
Humidity Icon72%
Wind Icon20km/h
Sun. 12, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon16°/14°
Humidity Icon88%
Wind Icon19km/h
Mon. 13, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/13°
Humidity Icon85%
Wind Icon13km/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
Sat. 25, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/8°
Humidity Icon75%
Wind Icon25km/h
Sun. 26, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/8°
Humidity Icon77%
Wind Icon27km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/7°
Humidity Icon74%
Wind Icon26km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/7°
Humidity Icon77%
Wind Icon25km/h
Wed. 29, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/7°
Humidity Icon76%
Wind Icon29km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/7°
Humidity Icon75%
Wind Icon27km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 6, Oct.

25°C

Low will be onTue. 28, Oct.

6.6°C

HumidityHumidity

High will be onWed. 8, Oct.

89%

Low will be onThu. 2, Oct.

61%

Wind SpeedWind Speed

High will be onFri. 10, Oct.

36km/h

Low will be onMon. 13, Oct.

12.6km/h

PrecipitationPrecipitation

High will be onMon. 27, Oct.

5.8mm

Low will be onThu. 9, Oct.

0.01mm

Ultraviolet IndexUV

High will be onSun. 5, Oct.

6

Low will be onSun. 26, Oct.

2

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