Waterloo, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Waterloo is High, with a 3.3% worsening in the climate score compared to last 15 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Aug. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Waterloo 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), Waterloo temperature has changed by around +1.7%, 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
3019
-36.6%
cloudyCloudy
5526
-52.7%
rainyRainy
10473
-29.8%
snowySnowy
1016
60%
mistyMisty
011
100%

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

Climate Change Indicators:

Over the past 15 years, Waterloo has experienced measurable shifts in key climate parameters, contributing to the current severity score of 52 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

52/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Waterloo experienced significant changes:

Temperature change of

+0.1 °C

Variation in annual rainfall

+51.9 %

Change in average humidity

-1.2 %

PM2.5 levels surged by

-15.07 %

Heatwave changed by

+0.9 day(s)

Coldwave changed by

-7.2 day(s)

Wind speeds changed by

+3.2 km/h

These indicators show that Waterloo is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

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

Waterloo Weather Forecast 30 Days (September - October 2025)
Waterloo, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Thu. 4, Sep.
moderate rainModerate rain
Temperature Icon16°/11°
Humidity Icon81%
Wind Icon22km/h
Fri. 5, Sep.
overcastOvercast
Temperature Icon21°/8°
Humidity Icon75%
Wind Icon45km/h
Sat. 6, Sep.
overcastOvercast
Temperature Icon17°/9°
Humidity Icon71%
Wind Icon28km/h
Sun. 7, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon16°/7°
Humidity Icon75%
Wind Icon21km/h
Mon. 8, Sep.
partly cloudyPartly Cloudy
Temperature Icon19°/7°
Humidity Icon73%
Wind Icon10km/h
Tue. 9, Sep.
sunnySunny
Temperature Icon24°/7°
Humidity Icon57%
Wind Icon15km/h
Wed. 10, Sep.
sunnySunny
Temperature Icon27°/12°
Humidity Icon47%
Wind Icon16km/h
Thu. 11, Sep.
sunnySunny
Temperature Icon23°/12°
Humidity Icon63%
Wind Icon19km/h
Fri. 12, Sep.
sunnySunny
Temperature Icon23°/10°
Humidity Icon55%
Wind Icon18km/h
Sat. 13, Sep.
sunnySunny
Temperature Icon26°/12°
Humidity Icon63%
Wind Icon21km/h
Sun. 14, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/15°
Humidity Icon87%
Wind Icon17km/h
Mon. 15, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon22°/16°
Humidity Icon93%
Wind Icon16km/h
Tue. 16, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon29°/14°
Humidity Icon75%
Wind Icon30km/h
Wed. 17, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/11°
Humidity Icon78%
Wind Icon15km/h
Thu. 18, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/11°
Humidity Icon77%
Wind Icon17km/h
Fri. 19, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon77%
Wind Icon16km/h
Sat. 20, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon22°/11°
Humidity Icon75%
Wind Icon16km/h
Sun. 21, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/12°
Humidity Icon79%
Wind Icon21km/h
Mon. 22, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/11°
Humidity Icon77%
Wind Icon20km/h
Tue. 23, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon79%
Wind Icon18km/h
Wed. 24, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon21°/10°
Humidity Icon74%
Wind Icon19km/h
Thu. 25, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/11°
Humidity Icon78%
Wind Icon19km/h
Fri. 26, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon81%
Wind Icon20km/h
Sat. 27, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon79%
Wind Icon20km/h
Sun. 28, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon19°/10°
Humidity Icon81%
Wind Icon19km/h
Mon. 29, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon18°/9°
Humidity Icon80%
Wind Icon19km/h
Tue. 30, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/9°
Humidity Icon79%
Wind Icon18km/h
Wed. 1, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/8°
Humidity Icon78%
Wind Icon18km/h
Thu. 2, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/8°
Humidity Icon78%
Wind Icon19km/h
Fri. 3, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/8°
Humidity Icon80%
Wind Icon19km/h
Sat. 4, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/8°
Humidity Icon81%
Wind Icon19km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 16, Sep.

28.7°C

Low will be onMon. 8, Sep.

6.5°C

HumidityHumidity

High will be onMon. 15, Sep.

93%

Low will be onWed. 10, Sep.

47%

Wind SpeedWind Speed

High will be onFri. 5, Sep.

44.6km/h

Low will be onMon. 8, Sep.

9.7km/h

PrecipitationPrecipitation

High will be onThu. 4, Sep.

15.6mm

Low will be onMon. 8, Sep.

0.01mm

Ultraviolet IndexUV

High will be onTue. 9, Sep.

5

Low will be onFri. 19, Sep.

3

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