Ottawa, Ontario, Canada Climate Change Severity
Very High
Ottawa Weather Condition Changes (Historic Vs 2025)
Over the past 15 year(s), Ottawa temperature has changed by around +8.08%, and has experienced notable climate changes.
Comparison of Weather Condition (Historic Vs 2025)
HistoricDays
Year 2025Days
Change
Sunny
Cloudy
Rainy
Snowy
MistyDisclaimer: 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
From 2010 to 2025, Ottawa experienced significant changes:
Temperature change of
+0.4 °C
Variation in annual rainfall
+32.7 %
Change in average humidity
-9.6 %
PM2.5 levels surged by
-29.9 %
Heatwave changed by
+6.7 day(s)
Coldwave changed by
-7 day(s)
Wind speeds changed by
+2.2 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.
Ottawa Weather Forecast 30 Days (August - September 2025)Ottawa, Ontario, Canada
Temperature
humi.
Wind Speed
Partly Cloudy 21°/11°62%20km/hSunny21°/11°56%14km/h
Heavy rain24°/12°69%17km/hPatchy rain nearby14°/7°78%15km/hPartly Cloudy 21°/6°76%15km/hPatchy rain nearby21°/10°67%13km/hSunny25°/9°55%7km/hSunny28°/12°52%4km/hSunny29°/13°53%9km/hPatchy rain nearby27°/14°67%19km/hPatchy rain nearby18°/15°89%15km/hPatchy rain nearby25°/14°82%11km/hSunny28°/11°51%17km/hSunny30°/13°50%20km/h
Heavy rain at times21°/12°75%14km/h
Moderate or heavy rain shower21°/11°77%14km/hModerate or heavy rain shower22°/12°78%16km/hModerate or heavy rain shower21°/12°80%17km/hModerate or heavy rain shower20°/11°78%17km/hModerate or heavy rain shower19°/10°75%14km/hModerate or heavy rain shower19°/10°75%14km/hModerate or heavy rain shower21°/10°77%14km/hModerate or heavy rain shower19°/10°80%16km/hModerate or heavy rain shower19°/9°75%13km/h
Moderate rain at times20°/10°75%14km/hModerate or heavy rain shower22°/11°79%16km/hModerate or heavy rain shower19°/11°79%17km/hModerate or heavy rain shower19°/10°80%16km/hModerate rain at times20°/10°76%16km/hModerate or heavy rain shower20°/10°78%14km/hHighest & Lowest Weather Forecasts
TemperatureHumidityWind Speed
Precipitation
UV
