Sarnia, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in Sarnia is High, with a 0.8% 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 Jun. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Sarnia 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), Sarnia temperature has changed by around -7.7%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty

Data: Jan. to Jun. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
208
-60%
cloudyCloudy
4236
-14.2%
rainyRainy
7154
-23.9%
snowySnowy
810
25%
mistyMisty
04
100%

Climate Change Indicators:

Over the past 15 years, Sarnia has experienced measurable shifts in key climate parameters, contributing to the current severity score of 48 (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

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Sarnia experienced significant changes:

Temperature change of

-0.4 °C

Variation in annual rainfall

+32.4 %

Change in average humidity

+1.5 %

PM2.5 levels surged by

+100 %

Heatwave changed by

-5.2 day(s)

Coldwave changed by

-6.2 day(s)

Wind speeds changed by

+2.3 km/h

These indicators show that Sarnia 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 Jun.

Sarnia Weather Forecast 30 Days (July - August 2025)
Sarnia, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 8, Jul.
partly cloudyPartly Cloudy
Temperature Icon24°/14°
Humidity Icon83%
Wind Icon12km/h
Wed. 9, Jul.
patchy rain possiblePatchy rain nearby
Temperature Icon27°/18°
Humidity Icon86%
Wind Icon22km/h
Thu. 10, Jul.
fogFog
Temperature Icon23°/18°
Humidity Icon91%
Wind Icon19km/h
Fri. 11, Jul.
partly cloudyPartly Cloudy
Temperature Icon27°/17°
Humidity Icon77%
Wind Icon15km/h
Sat. 12, Jul.
patchy rain possiblePatchy rain nearby
Temperature Icon28°/19°
Humidity Icon82%
Wind Icon35km/h
Sun. 13, Jul.
sunnySunny
Temperature Icon25°/19°
Humidity Icon73%
Wind Icon30km/h
Mon. 14, Jul.
sunnySunny
Temperature Icon28°/17°
Humidity Icon72%
Wind Icon13km/h
Tue. 15, Jul.
sunnySunny
Temperature Icon30°/20°
Humidity Icon71%
Wind Icon17km/h
Wed. 16, Jul.
sunnySunny
Temperature Icon30°/20°
Humidity Icon70%
Wind Icon19km/h
Thu. 17, Jul.
patchy rain possiblePatchy rain nearby
Temperature Icon30°/22°
Humidity Icon83%
Wind Icon16km/h
Fri. 18, Jul.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/20°
Humidity Icon90%
Wind Icon14km/h
Sat. 19, Jul.
cloudyCloudy
Temperature Icon23°/18°
Humidity Icon71%
Wind Icon15km/h
Sun. 20, Jul.
partly cloudyPartly Cloudy
Temperature Icon27°/20°
Humidity Icon67%
Wind Icon12km/h
Mon. 21, Jul.
patchy rain possiblePatchy rain nearby
Temperature Icon30°/20°
Humidity Icon82%
Wind Icon14km/h
Tue. 22, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon78%
Wind Icon17km/h
Wed. 23, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon82%
Wind Icon18km/h
Thu. 24, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/18°
Humidity Icon82%
Wind Icon19km/h
Fri. 25, Jul.
heavy rain at timesHeavy rain at times
Temperature Icon25°/17°
Humidity Icon78%
Wind Icon17km/h
Sat. 26, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon77%
Wind Icon17km/h
Sun. 27, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon81%
Wind Icon16km/h
Mon. 28, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon80%
Wind Icon20km/h
Tue. 29, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/17°
Humidity Icon80%
Wind Icon19km/h
Wed. 30, Jul.
patchy rain possiblePatchy rain possible
Temperature Icon25°/17°
Humidity Icon74%
Wind Icon15km/h
Thu. 31, Jul.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/17°
Humidity Icon78%
Wind Icon16km/h
Fri. 1, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/18°
Humidity Icon78%
Wind Icon17km/h
Sat. 2, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/17°
Humidity Icon77%
Wind Icon18km/h
Sun. 3, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/17°
Humidity Icon77%
Wind Icon18km/h
Mon. 4, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/18°
Humidity Icon79%
Wind Icon18km/h
Tue. 5, Aug.
moderate rain at timesModerate rain at times
Temperature Icon25°/17°
Humidity Icon76%
Wind Icon17km/h
Wed. 6, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/17°
Humidity Icon76%
Wind Icon15km/h
Thu. 7, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/17°
Humidity Icon78%
Wind Icon16km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 16, Jul.

30.3°C

Low will be onTue. 8, Jul.

14.2°C

HumidityHumidity

High will be onThu. 10, Jul.

91%

Low will be onSun. 20, Jul.

67%

Wind SpeedWind Speed

High will be onSat. 12, Jul.

35.3km/h

Low will be onTue. 8, Jul.

11.5km/h

PrecipitationPrecipitation

High will be onTue. 29, Jul.

5.2mm

Low will be onSat. 19, Jul.

0.01mm

Ultraviolet IndexUV

High will be onWed. 16, Jul.

7

Low will be onSat. 12, Jul.

0.1

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