Thunder Bay, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Thunder Bay is High, with a 6.2% 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)

Thunder Bay 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), Thunder Bay temperature has changed by around +0.6%, 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
4224
-42.8%
cloudyCloudy
7257
-20.8%
rainyRainy
8647
-45.3%
snowySnowy
1216
33.3%
mistyMisty
017
100%

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

Climate Change Indicators:

Over the past 15 years, Thunder Bay 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, Thunder Bay experienced significant changes:

Temperature change of

+0.03 °C

Variation in annual rainfall

+106.9 %

Change in average humidity

-5.6 %

PM2.5 levels surged by

-1.8 %

Heatwave changed by

-5.4 day(s)

Coldwave changed by

-9.1 day(s)

Wind speeds changed by

-0.5 km/h

These indicators show that Thunder Bay 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.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sun. 5, Oct.
sunnySunny
Temperature Icon28°/17°
Humidity Icon59%
Wind Icon31km/h
Mon. 6, Oct.
sunnySunny
Temperature Icon16°/7°
Humidity Icon58%
Wind Icon30km/h
Tue. 7, Oct.
sunnySunny
Temperature Icon15°/6°
Humidity Icon40%
Wind Icon18km/h
Wed. 8, Oct.
sunnySunny
Temperature Icon16°/3°
Humidity Icon52%
Wind Icon10km/h
Thu. 9, Oct.
sunnySunny
Temperature Icon18°/4°
Humidity Icon68%
Wind Icon21km/h
Fri. 10, Oct.
partly cloudyPartly Cloudy
Temperature Icon18°/9°
Humidity Icon70%
Wind Icon9km/h
Sat. 11, Oct.
sunnySunny
Temperature Icon17°/9°
Humidity Icon74%
Wind Icon12km/h
Sun. 12, Oct.
sunnySunny
Temperature Icon16°/9°
Humidity Icon71%
Wind Icon19km/h
Mon. 13, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/11°
Humidity Icon76%
Wind Icon25km/h
Tue. 14, Oct.
sunnySunny
Temperature Icon12°/6°
Humidity Icon73%
Wind Icon13km/h
Wed. 15, Oct.
moderate rainModerate rain
Temperature Icon11°/7°
Humidity Icon93%
Wind Icon30km/h
Thu. 16, Oct.
moderate rainModerate rain
Temperature Icon13°/8°
Humidity Icon90%
Wind Icon25km/h
Fri. 17, Oct.
cloudyCloudy
Temperature Icon6°/3°
Humidity Icon68%
Wind Icon23km/h
Sat. 18, Oct.
sunnySunny
Temperature Icon6°/0°
Humidity Icon74%
Wind Icon12km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon77%
Wind Icon19km/h
Mon. 20, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon8°/3°
Humidity Icon74%
Wind Icon18km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/3°
Humidity Icon78%
Wind Icon19km/h
Wed. 22, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon9°/3°
Humidity Icon79%
Wind Icon18km/h
Thu. 23, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/3°
Humidity Icon82%
Wind Icon21km/h
Fri. 24, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/3°
Humidity Icon81%
Wind Icon21km/h
Sat. 25, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/2°
Humidity Icon75%
Wind Icon19km/h
Sun. 26, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/2°
Humidity Icon79%
Wind Icon22km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/1°
Humidity Icon81%
Wind Icon23km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/1°
Humidity Icon82%
Wind Icon21km/h
Wed. 29, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon6°/1°
Humidity Icon80%
Wind Icon18km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/1°
Humidity Icon79%
Wind Icon19km/h
Fri. 31, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon5°/0°
Humidity Icon78%
Wind Icon22km/h
Sat. 1, Nov.
moderate rain at timesModerate rain at times
Temperature Icon5°/0°
Humidity Icon75%
Wind Icon19km/h
Sun. 2, Nov.
heavy rain at timesHeavy rain at times
Temperature Icon5°/0°
Humidity Icon78%
Wind Icon18km/h
Mon. 3, Nov.
moderate rain at timesModerate rain at times
Temperature Icon5°/1°
Humidity Icon79%
Wind Icon17km/h
Tue. 4, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/1°
Humidity Icon79%
Wind Icon20km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSun. 5, Oct.

27.7°C

Low will be onSat. 18, Oct.

-0.2°C

HumidityHumidity

High will be onWed. 15, Oct.

93%

Low will be onTue. 7, Oct.

40%

Wind SpeedWind Speed

High will be onSun. 5, Oct.

31.3km/h

Low will be onFri. 10, Oct.

9km/h

PrecipitationPrecipitation

High will be onWed. 15, Oct.

12.7mm

Low will be onFri. 17, Oct.

0.03mm

Ultraviolet IndexUV

High will be onFri. 10, Oct.

4

Low will be onFri. 17, Oct.

1

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