Weather in Ottawa in April

A hard month. April asks something of you. Go in knowing what. Highs sit at 11.1 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

April ranks 7 of 12 in Ottawa: past the worst of the year but short of September, which is the month to book if the dates are open.

Rain on 13 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 11.1 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 17 nights fall below freezing. Across the twenty years measured, the hottest April day reached 27.2 °C and the coldest night fell to -13.7 °C, and the wettest single day dropped 32 mm — roughly 38% of the month's rain in one day.

April is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest April on record still delivered 136 mm against 27 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 85 mm average is a reasonable planning figure, not a promise.

Wind is light at 2.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, which at 11.1 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How April sits in the year

The month is on the way up: 9.5 °C warmer than March, and May adds another 7.6 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

13.5 hours of daylight, gaining 1.5 hours across the month. That is between Ottawa's extremes of 15.6 and 8.8 hours, so days are long enough not to constrain the plan.

An inland climate

Ottawa has no sea to moderate it, and it shows: 42.4 °C separates the hottest afternoon of the year from the coldest night. That is a genuinely continental range, and it means summer and winter here are barely the same place.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

April in Ottawa versus nearby

If Ottawa is one option among several, the nearby comparison is worth making. Kingston is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Montréal is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: April is a compromise. September is 31 points better and is what Ottawa is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Ottawa

See all twelve months in Ottawa, or where else to go in April.