Sarnia, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in Sarnia is High, with a 0.9% 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 Sep. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (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 -4.02%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
4114
-65.8%
cloudyCloudy
6450
-21.8%
rainyRainy
11362
-45.1%
snowySnowy
810
25%
mistyMisty
011
100%

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

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

+44.6 %

Change in average humidity

+2.5 %

PM2.5 levels surged by

+100 %

Heatwave changed by

-6.6 day(s)

Coldwave changed by

-4.1 day(s)

Wind speeds changed by

+2.1 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 Sep.

Sarnia Weather Forecast 30 Days (October - November 2025)
Sarnia, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 25, Oct.
sunnySunny
Temperature Icon11°/2°
Humidity Icon74%
Wind Icon12km/h
Sun. 26, Oct.
partly cloudyPartly Cloudy
Temperature Icon12°/6°
Humidity Icon71%
Wind Icon15km/h
Mon. 27, Oct.
sunnySunny
Temperature Icon11°/2°
Humidity Icon72%
Wind Icon26km/h
Tue. 28, Oct.
sunnySunny
Temperature Icon12°/4°
Humidity Icon66%
Wind Icon27km/h
Wed. 29, Oct.
sunnySunny
Temperature Icon10°/5°
Humidity Icon67%
Wind Icon24km/h
Thu. 30, Oct.
sunnySunny
Temperature Icon11°/5°
Humidity Icon67%
Wind Icon12km/h
Fri. 31, Oct.
sunnySunny
Temperature Icon12°/4°
Humidity Icon63%
Wind Icon29km/h
Sat. 1, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon12°/7°
Humidity Icon60%
Wind Icon33km/h
Sun. 2, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/7°
Humidity Icon72%
Wind Icon43km/h
Mon. 3, Nov.
cloudyCloudy
Temperature Icon11°/4°
Humidity Icon65%
Wind Icon27km/h
Tue. 4, Nov.
sunnySunny
Temperature Icon15°/10°
Humidity Icon56%
Wind Icon28km/h
Wed. 5, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/8°
Humidity Icon70%
Wind Icon48km/h
Thu. 6, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/7°
Humidity Icon58%
Wind Icon26km/h
Fri. 7, Nov.
patchy rain possiblePatchy rain nearby
Temperature Icon7°/3°
Humidity Icon64%
Wind Icon25km/h
Sat. 8, Nov.
moderate rain at timesModerate rain at times
Temperature Icon10°/4°
Humidity Icon72%
Wind Icon19km/h
Sun. 9, Nov.
heavy rain at timesHeavy rain at times
Temperature Icon11°/4°
Humidity Icon73%
Wind Icon25km/h
Mon. 10, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon76%
Wind Icon26km/h
Wed. 12, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/1°
Humidity Icon71%
Wind Icon25km/h
Thu. 13, Nov.
moderate rain at timesModerate rain at times
Temperature Icon6°/0°
Humidity Icon72%
Wind Icon26km/h
Fri. 14, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/1°
Humidity Icon74%
Wind Icon22km/h
Sat. 15, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/2°
Humidity Icon80%
Wind Icon25km/h
Sun. 16, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/2°
Humidity Icon78%
Wind Icon23km/h
Mon. 17, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/1°
Humidity Icon80%
Wind Icon29km/h
Tue. 18, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/2°
Humidity Icon76%
Wind Icon27km/h
Wed. 19, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/0°
Humidity Icon76%
Wind Icon27km/h
Thu. 20, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/0°
Humidity Icon75%
Wind Icon28km/h
Fri. 21, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/0°
Humidity Icon79%
Wind Icon28km/h
Sun. 23, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/0°
Humidity Icon77%
Wind Icon25km/h
Mon. 24, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/0°
Humidity Icon79%
Wind Icon26km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 5, Nov.

17.1°C

Low will be onSun. 23, Nov.

-0.2°C

HumidityHumidity

High will be onSat. 15, Nov.

80%

Low will be onTue. 4, Nov.

56%

Wind SpeedWind Speed

High will be onWed. 5, Nov.

48.2km/h

Low will be onThu. 30, Oct.

11.9km/h

PrecipitationPrecipitation

High will be onFri. 21, Nov.

4.2mm

Low will be onThu. 30, Oct.

0.01mm

Ultraviolet IndexUV

High will be onTue. 4, Nov.

4

Low will be onFri. 7, Nov.

1

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