Weather in Ottawa
Live weather and 7-day forecast for Ottawa, Canada, followed by what to expect in each month of the year.
Sunrise 07:29 Sunset 18:07 Daylight 10h 38m Sun times →
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7-day forecast
Forecast data from Open-Meteo
Climate in Ottawa: month by month
Averaged over 2023–2025, the warmest month in Ottawa is July, with highs around 27 °C (81 °F) and lows around 18 °C (64 °F); the coolest is January, with highs around -3 °C (27 °F) and lows around -11 °C (13 °F). Average lows fall below freezing in November–March.
Ottawa gets about 1,077 mm (42 in) of precipitation a year. The wettest month is July (148 mm over about 13 days) and the driest is September (39 mm).
| Month | Avg high | Avg low | Precipitation (mm) | Wet days | Daylight |
|---|---|---|---|---|---|
| January | -3° | -11° | 77 | 12 | 9h 6m |
| February | -1° | -12° | 60 | 11 | 10h 25m |
| March | 5° | -5° | 75 | 12 | 11h 52m |
| April | 12° | 1° | 104 | 14 | 13h 30m |
| May | 19° | 8° | 95 | 13 | 14h 53m |
| June | 25° | 15° | 116 | 12 | 15h 39m |
| July | 27° | 18° | 148 | 13 | 15h 20m |
| August | 25° | 16° | 139 | 12 | 14h 8m |
| September | 23° | 13° | 39 | 6 | 12h 34m |
| October | 16° | 7° | 73 | 10 | 11h 0m |
| November | 5° | 0° | 61 | 12 | 9h 32m |
| December | -1° | -8° | 90 | 14 | 8h 44m |
Averages of daily values from the ERA5 reanalysis for 2023–2025 at Ottawa's coordinates (model elevation 76 m), via Open-Meteo (CC BY 4.0). Three recent years are not a 30-year climate normal; reanalysis smooths local extremes and tends to count more light-rain days than a rain gauge would. Daylight is sunrise to sunset on the 15th of each month.
Weather questions for Ottawa
What is the hottest month in Ottawa?
July, with average highs of 27 °C (81 °F) and lows of 18 °C (64 °F) over 2023–2025. The coolest month is January, averaging -3 °C (27 °F) by day and -11 °C (13 °F) at night.
What is the rainiest month in Ottawa?
July, with about 148 mm of precipitation on roughly 13 days. The driest month is September (39 mm), and the yearly total is around 1,077 mm.
When is the weather mildest in Ottawa?
Going by the averages, May–September are the months with average daytime highs between 18 °C and 27 °C (64–81 °F) — warm but not hot. July is the month most likely to bring rain.
More about Ottawa
Weather in nearby cities
More for Ottawa
More for Ottawa: local time, sunrise and sunset, moon phases, and the exact time zone.
About this forecast
The live forecast comes from Open-Meteo, which blends models from national weather services and is fetched fresh in your browser on each visit. Times in the hourly outlook are Ottawa local time (America/Toronto).