Thunder Bay, Ontario, Canada Climate Change Severity

52
High
The current climate change severity in Thunder Bay is High, with a 0.5% 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

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 +3.6%, 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
2718
-33.3%
cloudyCloudy
5647
-16.07%
rainyRainy
6144
-27.8%
snowySnowy
1216
33.3%
mistyMisty
011
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

+0.07 °C

Variation in annual rainfall

+89.2 %

Change in average humidity

-8.3 %

PM2.5 levels surged by

-7.8 %

Heatwave changed by

-4.3 day(s)

Coldwave changed by

-8.7 day(s)

Wind speeds changed by

-0.3 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 Jul.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 2, Aug.
sunnySunny
Temperature Icon29°/17°
Humidity Icon56%
Wind Icon17km/h
Sun. 3, Aug.
sunnySunny
Temperature Icon28°/17°
Humidity Icon63%
Wind Icon17km/h
Mon. 4, Aug.
partly cloudyPartly Cloudy
Temperature Icon22°/13°
Humidity Icon84%
Wind Icon11km/h
Tue. 5, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/11°
Humidity Icon83%
Wind Icon13km/h
Wed. 6, Aug.
partly cloudyPartly Cloudy
Temperature Icon22°/14°
Humidity Icon81%
Wind Icon15km/h
Thu. 7, Aug.
moderate rainModerate rain
Temperature Icon25°/17°
Humidity Icon93%
Wind Icon19km/h
Fri. 8, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/17°
Humidity Icon91%
Wind Icon8km/h
Sat. 9, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/16°
Humidity Icon93%
Wind Icon12km/h
Sun. 10, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/14°
Humidity Icon85%
Wind Icon22km/h
Mon. 11, Aug.
partly cloudyPartly Cloudy
Temperature Icon17°/10°
Humidity Icon77%
Wind Icon16km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon21°/12°
Humidity Icon71%
Wind Icon12km/h
Wed. 13, Aug.
sunnySunny
Temperature Icon21°/13°
Humidity Icon72%
Wind Icon19km/h
Thu. 14, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon20°/16°
Humidity Icon90%
Wind Icon19km/h
Fri. 15, Aug.
moderate rainModerate rain
Temperature Icon18°/10°
Humidity Icon69%
Wind Icon27km/h
Sat. 16, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/15°
Humidity Icon75%
Wind Icon19km/h
Sun. 17, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon21°/14°
Humidity Icon72%
Wind Icon19km/h
Mon. 18, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/14°
Humidity Icon74%
Wind Icon18km/h
Tue. 19, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/14°
Humidity Icon77%
Wind Icon16km/h
Wed. 20, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/15°
Humidity Icon83%
Wind Icon18km/h
Thu. 21, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/13°
Humidity Icon73%
Wind Icon17km/h
Fri. 22, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon74%
Wind Icon16km/h
Sat. 23, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon77%
Wind Icon17km/h
Sun. 24, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon17km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon77%
Wind Icon19km/h
Tue. 26, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon17km/h
Wed. 27, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/13°
Humidity Icon79%
Wind Icon18km/h
Thu. 28, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/13°
Humidity Icon82%
Wind Icon17km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/14°
Humidity Icon82%
Wind Icon18km/h
Sat. 30, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon77%
Wind Icon18km/h
Sun. 31, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon18km/h
Mon. 1, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon18km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSat. 2, Aug.

28.9°C

Low will be onFri. 15, Aug.

9.5°C

HumidityHumidity

High will be onThu. 7, Aug.

93%

Low will be onSat. 2, Aug.

56%

Wind SpeedWind Speed

High will be onFri. 15, Aug.

27.4km/h

Low will be onFri. 8, Aug.

8.3km/h

PrecipitationPrecipitation

High will be onThu. 7, Aug.

11.6mm

Low will be onMon. 11, Aug.

0.01mm

Ultraviolet IndexUV

High will be onWed. 6, Aug.

5

Low will be onFri. 15, Aug.

3

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