Ottawa weather in August
Long-run climate averages for Ottawa, Ontario in August, plus what the forecast models say for the days ahead.
In August, Ottawa averages 24°C by day and 16°C at night. It is the wettest month of the year here.
August in Ottawa averages a daytime high of 24°C and an overnight low of 16°C, which reads as warm for this part of the world. It is among the three warmest months of the year here. It is also the wettest month, so build rain into any plan. Across the whole year Ottawa sees roughly 1154 mm of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Ottawa forecast with every model compared and how much they currently agree.
Ottawa weather by month
what to expect in Ottawa through the yearHere is Ottawa's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Ottawa by season.