Ottawa, Ontario, Canada Climate Change Severity

62
Very High
The current climate change severity in Ottawa is Very High, with a 31.1% 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)

Ottawa 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), Ottawa temperature has changed by around +7.6%, 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
3828
-26.3%
cloudyCloudy
6453
-17.1%
rainyRainy
11068
-38.1%
snowySnowy
1316
23.07%
mistyMisty
010
100%

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

Climate Change Indicators:

Over the past 15 years, Ottawa has experienced measurable shifts in key climate parameters, contributing to the current severity score of 62 (within the Very High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

62/100

Very High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Ottawa experienced significant changes:

Temperature change of

+0.6 °C

Variation in annual rainfall

+19.7 %

Change in average humidity

-11.3 %

PM2.5 levels surged by

-26.3 %

Heatwave changed by

+11.1 day(s)

Coldwave changed by

-7.3 day(s)

Wind speeds changed by

+1.9 km/h

These indicators show a dramatic increase in volatility and worsening conditions. Ottawa's Very High severity status requires urgent and immediate adaptation and mitigation strategies, particularly focused on managing extreme weather events, improving air quality, and ensuring water resources are adequate for the population.

Check how we calculate Climate Change Severity
Based on data from Jan. to Sep.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Thu. 2, Oct.
sunnySunny
Temperature Icon20°/5°
Humidity Icon54%
Wind Icon8km/h
Fri. 3, Oct.
sunnySunny
Temperature Icon24°/7°
Humidity Icon65%
Wind Icon17km/h
Sat. 4, Oct.
partly cloudyPartly Cloudy
Temperature Icon23°/15°
Humidity Icon73%
Wind Icon13km/h
Sun. 5, Oct.
sunnySunny
Temperature Icon29°/14°
Humidity Icon60%
Wind Icon19km/h
Mon. 6, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon28°/12°
Humidity Icon69%
Wind Icon20km/h
Tue. 7, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon17°/14°
Humidity Icon95%
Wind Icon12km/h
Wed. 8, Oct.
sunnySunny
Temperature Icon13°/5°
Humidity Icon62%
Wind Icon19km/h
Thu. 9, Oct.
sunnySunny
Temperature Icon15°/3°
Humidity Icon47%
Wind Icon11km/h
Fri. 10, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon11°/6°
Humidity Icon69%
Wind Icon18km/h
Sat. 11, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/8°
Humidity Icon82%
Wind Icon23km/h
Sun. 12, Oct.
partly cloudyPartly Cloudy
Temperature Icon18°/11°
Humidity Icon76%
Wind Icon10km/h
Mon. 13, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon13°/8°
Humidity Icon83%
Wind Icon29km/h
Tue. 14, Oct.
partly cloudyPartly Cloudy
Temperature Icon8°/1°
Humidity Icon64%
Wind Icon26km/h
Wed. 15, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon14°/6°
Humidity Icon81%
Wind Icon21km/h
Thu. 16, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/6°
Humidity Icon80%
Wind Icon20km/h
Fri. 17, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon78%
Wind Icon18km/h
Sat. 18, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon12°/4°
Humidity Icon77%
Wind Icon19km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon80%
Wind Icon20km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/6°
Humidity Icon84%
Wind Icon20km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/5°
Humidity Icon83%
Wind Icon20km/h
Wed. 22, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/5°
Humidity Icon80%
Wind Icon19km/h
Thu. 23, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon12°/4°
Humidity Icon79%
Wind Icon18km/h
Fri. 24, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon79%
Wind Icon18km/h
Sat. 25, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon79%
Wind Icon18km/h
Sun. 26, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/5°
Humidity Icon81%
Wind Icon17km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/3°
Humidity Icon79%
Wind Icon19km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon81%
Wind Icon18km/h
Wed. 29, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/3°
Humidity Icon81%
Wind Icon18km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon82%
Wind Icon18km/h
Fri. 31, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon83%
Wind Icon18km/h
Sat. 1, Nov.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/2°
Humidity Icon82%
Wind Icon20km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSun. 5, Oct.

29°C

Low will be onTue. 14, Oct.

1.3°C

HumidityHumidity

High will be onTue. 7, Oct.

95%

Low will be onThu. 9, Oct.

47%

Wind SpeedWind Speed

High will be onMon. 13, Oct.

29.2km/h

Low will be onThu. 2, Oct.

8.3km/h

PrecipitationPrecipitation

High will be onThu. 30, Oct.

7.4mm

Low will be onTue. 14, Oct.

0.02mm

Ultraviolet IndexUV

High will be onTue. 7, Oct.

4

Low will be onFri. 10, Oct.

2

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