St Thomas, Ontario, Canada Climate Change Severity

48
High
The current climate change severity in St Thomas is High, with a 2.1% 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)

St Thomas 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), St Thomas temperature has changed by around -1.2%, 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
3815
-60.5%
cloudyCloudy
5734
-40.3%
rainyRainy
12175
-38.01%
snowySnowy
1011
10%
mistyMisty
020
100%

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

Climate Change Indicators:

Over the past 15 years, St Thomas 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, St Thomas experienced significant changes:

Temperature change of

-0.1 °C

Variation in annual rainfall

+36.9 %

Change in average humidity

+0.5 %

PM2.5 levels surged by

-15.1 %

Heatwave changed by

-4.06 day(s)

Coldwave changed by

-4.4 day(s)

Wind speeds changed by

+3.2 km/h

These indicators show that St Thomas 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.

St Thomas Weather Forecast 30 Days (October 2025)
St Thomas, Ontario, Canada

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 1, Oct.
sunnySunny
Temperature Icon22°/9°
Humidity Icon56%
Wind Icon25km/h
Thu. 2, Oct.
partly cloudyPartly Cloudy
Temperature Icon19°/9°
Humidity Icon74%
Wind Icon23km/h
Fri. 3, Oct.
sunnySunny
Temperature Icon24°/13°
Humidity Icon78%
Wind Icon18km/h
Sat. 4, Oct.
sunnySunny
Temperature Icon26°/16°
Humidity Icon69%
Wind Icon20km/h
Sun. 5, Oct.
sunnySunny
Temperature Icon25°/18°
Humidity Icon63%
Wind Icon22km/h
Mon. 6, Oct.
sunnySunny
Temperature Icon26°/16°
Humidity Icon69%
Wind Icon24km/h
Tue. 7, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/17°
Humidity Icon81%
Wind Icon22km/h
Wed. 8, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon13°/5°
Humidity Icon62%
Wind Icon31km/h
Thu. 9, Oct.
sunnySunny
Temperature Icon14°/5°
Humidity Icon56%
Wind Icon25km/h
Fri. 10, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/13°
Humidity Icon70%
Wind Icon30km/h
Sat. 11, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/9°
Humidity Icon64%
Wind Icon50km/h
Sun. 12, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/7°
Humidity Icon58%
Wind Icon40km/h
Mon. 13, Oct.
sunnySunny
Temperature Icon14°/5°
Humidity Icon57%
Wind Icon24km/h
Tue. 14, Oct.
cloudyCloudy
Temperature Icon17°/8°
Humidity Icon53%
Wind Icon25km/h
Wed. 15, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/6°
Humidity Icon79%
Wind Icon27km/h
Thu. 16, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/6°
Humidity Icon78%
Wind Icon22km/h
Fri. 17, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon13°/6°
Humidity Icon76%
Wind Icon23km/h
Sat. 18, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon13°/5°
Humidity Icon75%
Wind Icon22km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/5°
Humidity Icon77%
Wind Icon23km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/6°
Humidity Icon78%
Wind Icon22km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/7°
Humidity Icon79%
Wind Icon24km/h
Wed. 22, Oct.
moderate rain at timesModerate rain at times
Temperature Icon13°/6°
Humidity Icon76%
Wind Icon22km/h
Thu. 23, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/6°
Humidity Icon79%
Wind Icon23km/h
Fri. 24, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/6°
Humidity Icon77%
Wind Icon22km/h
Sat. 25, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/6°
Humidity Icon79%
Wind Icon22km/h
Sun. 26, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/5°
Humidity Icon80%
Wind Icon25km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/5°
Humidity Icon80%
Wind Icon23km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon80%
Wind Icon22km/h
Wed. 29, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/5°
Humidity Icon81%
Wind Icon24km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon82%
Wind Icon24km/h
Fri. 31, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon84%
Wind Icon25km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSat. 4, Oct.

26.1°C

Low will be onFri. 31, Oct.

4.1°C

HumidityHumidity

High will be onFri. 31, Oct.

84%

Low will be onTue. 14, Oct.

53%

Wind SpeedWind Speed

High will be onSat. 11, Oct.

50km/h

Low will be onFri. 3, Oct.

17.6km/h

PrecipitationPrecipitation

High will be onFri. 31, Oct.

7.3mm

Low will be onMon. 13, Oct.

0.01mm

Ultraviolet IndexUV

High will be onMon. 6, Oct.

6

Low will be onSun. 12, Oct.

2

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