The best time to visit Ottawa
Month-by-month climate averages for Ottawa, Ontario, so you can pick your dates on data rather than guesswork.
The most comfortable time to visit Ottawa is usually May, June, July and August, when daytime highs sit in the pleasant 16-26°C range and the heaviest September rain is behind you.
Ottawa is warmest in July (highs near 25°C) and coldest in February (lows around -14°C), with roughly 960 mm of precipitation across the year and September the wettest month. The sweet spot for most visitors is May, June, July and August. Expect overnight frost in January, February, March, April, November and December.
These are long-run averages. For the actual days you are travelling, check the live Ottawa forecast - and note how much the models agree, because that tells you how much to trust it.
Ottawa weather by month
what to expect in Ottawa through the year, 1991-2020 averagesHere 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.