Oshawa, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Oshawa is High, with a 4.9% 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 Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Oshawa 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), Oshawa temperature has changed by around -5.3%, 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
2912
-58.6%
cloudyCloudy
5136
-29.4%
rainyRainy
8369
-16.8%
snowySnowy
912
33.3%
mistyMisty
07
100%

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

Climate Change Indicators:

Over the past 15 years, Oshawa 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, Oshawa experienced significant changes:

Temperature change of

-0.3 °C

Variation in annual rainfall

+32.2 %

Change in average humidity

+0.9 %

PM2.5 levels surged by

-14.09 %

Heatwave changed by

-0.4 day(s)

Coldwave changed by

-8.2 day(s)

Wind speeds changed by

+3.4 km/h

These indicators show that Oshawa 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 Jul.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sun. 31, Aug.
partly cloudyPartly Cloudy
Temperature Icon26°/9°
Humidity Icon74%
Wind Icon18km/h
Mon. 1, Sep.
partly cloudyPartly Cloudy
Temperature Icon23°/13°
Humidity Icon76%
Wind Icon15km/h
Tue. 2, Sep.
partly cloudyPartly Cloudy
Temperature Icon23°/13°
Humidity Icon77%
Wind Icon13km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon25°/16°
Humidity Icon61%
Wind Icon20km/h
Thu. 4, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/12°
Humidity Icon80%
Wind Icon33km/h
Fri. 5, Sep.
cloudyCloudy
Temperature Icon19°/11°
Humidity Icon60%
Wind Icon40km/h
Sat. 6, Sep.
sunnySunny
Temperature Icon20°/12°
Humidity Icon61%
Wind Icon33km/h
Sun. 7, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon18°/11°
Humidity Icon61%
Wind Icon28km/h
Mon. 8, Sep.
partly cloudyPartly Cloudy
Temperature Icon18°/10°
Humidity Icon68%
Wind Icon25km/h
Tue. 9, Sep.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/10°
Humidity Icon78%
Wind Icon20km/h
Wed. 10, Sep.
moderate rainModerate rain
Temperature Icon18°/11°
Humidity Icon71%
Wind Icon27km/h
Thu. 11, Sep.
sunnySunny
Temperature Icon19°/8°
Humidity Icon55%
Wind Icon18km/h
Fri. 12, Sep.
sunnySunny
Temperature Icon22°/12°
Humidity Icon59%
Wind Icon19km/h
Sat. 13, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon78%
Wind Icon21km/h
Sun. 14, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon76%
Wind Icon19km/h
Mon. 15, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon20°/12°
Humidity Icon73%
Wind Icon17km/h
Tue. 16, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon20°/13°
Humidity Icon74%
Wind Icon17km/h
Wed. 17, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon16km/h
Thu. 18, Sep.
moderate rain at timesModerate rain at times
Temperature Icon21°/13°
Humidity Icon74%
Wind Icon19km/h
Fri. 19, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon20°/12°
Humidity Icon73%
Wind Icon17km/h
Sat. 20, Sep.
moderate rain at timesModerate rain at times
Temperature Icon21°/13°
Humidity Icon73%
Wind Icon17km/h
Sun. 21, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/14°
Humidity Icon76%
Wind Icon19km/h
Mon. 22, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/13°
Humidity Icon76%
Wind Icon19km/h
Tue. 23, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/12°
Humidity Icon76%
Wind Icon19km/h
Wed. 24, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon21°/12°
Humidity Icon74%
Wind Icon19km/h
Thu. 25, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon74%
Wind Icon20km/h
Fri. 26, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon76%
Wind Icon21km/h
Sat. 27, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/13°
Humidity Icon76%
Wind Icon19km/h
Sun. 28, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon19°/13°
Humidity Icon78%
Wind Icon21km/h
Mon. 29, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon18°/12°
Humidity Icon76%
Wind Icon21km/h
Tue. 30, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/11°
Humidity Icon75%
Wind Icon21km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSun. 31, Aug.

25.6°C

Low will be onThu. 11, Sep.

7.8°C

HumidityHumidity

High will be onThu. 4, Sep.

80%

Low will be onThu. 11, Sep.

55%

Wind SpeedWind Speed

High will be onFri. 5, Sep.

39.6km/h

Low will be onTue. 2, Sep.

13.3km/h

PrecipitationPrecipitation

High will be onSun. 28, Sep.

6.5mm

Low will be onMon. 8, Sep.

0.01mm

Ultraviolet IndexUV

High will be onSat. 6, Sep.

5

Low will be onFri. 5, Sep.

3

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