Ottawa weather
Loading live data…Latest for Ottawa: European (ECMWF): 54° Overcast · American (NOAA GFS): 55° Partly cloudy · German (DWD ICON): 57° Overcast.
The weather map: all three models at once
European, American, German side by side around Ottawa and nearby towns.Live rain radar →Hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
10-day forecast, out to 14 days
where the models agree, and where they splitHeading to Ottawa? Ottawa, Canada, sits at 45.4°N in a temperate climate zone. Before you lock in outdoor plans, compare how the three global models - European (ECMWF), American (GFS) and German (ICON) - forecast Ottawa right now. Where they agree you can trust it; the days they split are exactly when a single weather app is least reliable. For a city break, the rain hours below tell you which days to plan indoors.
Best time to visit Ottawa
The most comfortable time to visit Ottawa is usually May, June and August, when daytime highs sit in the pleasant 60-78°F range and the heaviest September rain is behind you.
Ottawa weather by month
what to expect in Ottawa through the year, 1991-2020 normals, Ottawa CDA (WMO)Here is Ottawa's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Ottawa by season.
Ottawa compared with New York City
30-year averages: daytime highs month by month, rain and sunlightCooler through the year
average daytime high: Ottawa 53°F, New York City 63°F
Rain over a year
Ottawa 38 in, New York City 50 in
Sunlight vs a clear sky
solar energy reaching the ground as a share of a cloudless day, averaged over the year (not sunshine hours)
On 30-year averages Ottawa runs 10°F cooler than New York City, with every month between −17°F and −4°F. Over a year it gets 24% less rain than New York City.
Month by month in numbers
| Month | Ottawa | New York City | Difference | Sunlight, Ottawa | Sunlight, New York City |
|---|---|---|---|---|---|
| January | 23°F | 40°F | −17°F | 62% | 68% |
| February | 26°F | 42°F | −16°F | 68% | 71% |
| March | 36°F | 50°F | −14°F | 70% | 69% |
| April | 52°F | 62°F | −10°F | 68% | 71% |
| May | 67°F | 71°F | −4°F | 69% | 70% |
| June | 76°F | 80°F | −4°F | 72% | 76% |
| July | 80°F | 85°F | −5°F | 77% | 80% |
| August | 78°F | 83°F | −5°F | 77% | 78% |
| September | 70°F | 76°F | −6°F | 75% | 76% |
| October | 56°F | 65°F | −9°F | 63% | 71% |
| November | 42°F | 54°F | −12°F | 60% | 72% |
| December | 29°F | 44°F | −15°F | 55% | 66% |
Daytime highs and lows on this page are 1991-2020 averages. Ottawa: station normals from Ottawa CDA (WMO); rain is the CHELSA 1981-2010 climatology on a 1 km grid. New York City: station normals from New York Central Park (WMO), rain included. Sunlight vs a clear sky is NASA POWER's long-term average of the solar energy reaching the ground as a share of a cloudless day; it compares cloudiness and is not a count of sunshine hours. New York City stands in for the US here; other cities have their own climate tables.