ClimateAverages

Ottawa Weather in August

JanFebMarAprMayJunJulAugSepOctNovDec
Right now
21°C
Light rain · feels like 21°C
Humidity
83%
Wind
4 kph NW
UV
0.2
Rain
0%
Updated Jul 9, 07:45 AMWeather data by WeatherAPI.com
August daytime high
25.1°C
August overnight low
12.9°C
August average
19.0°C

In August, Ottawa typically sees daytime highs of 25.1°C and overnight lows around 12.9°C. Compared to the annual average high of 11.1°C, August runs +14.0°C.

vs. annual avg high
+14.0°C
Rank among 12 months
#2 warmest
Hottest year overall
2023

Where August ranks in Ottawa

JanFebMarAprMayJunJulAug25°SepOctNovDec

FAQ

What is the average temperature in Ottawa in August?

August in Ottawa averages a daytime high of 25.1°C and an overnight low of 12.9°C.

Is August warm or cold in Ottawa?

August runs +14.0°C compared to Ottawa's annual average high of 11.1°C, ranking #2 of 12 months by warmth.

What should I pack for Ottawa in August?

Plan for daytime highs near 25.1°C and cooler evenings around 12.9°C.

Other months for Ottawa

JanuaryFebruaryMarchAprilMayJuneJulySeptemberOctoberNovemberDecember

August in nearby cities

TorontoLondonMississaugaNorth YorkScarboroughHamiltonBramptonEtobicokeWindsorMarkhamOshawaVaughan