Ottawa weather in October
Temperature, rain and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Fair
Best time to visit: May – September
What is the weather like in Ottawa in October?
In October, Ottawa is cool: daytime highs average 13 °C, and nights cool down to about 6 °C. Expect around 4 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 98 mm in total. All in all, October is a so-so month for a holiday in Ottawa.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 78 | 44 | 15 |
| Day | 21° | 13° | 6° |
| Night | 13° | 6° | −1° |
| Sun | 6 h | 4 h | 3 h |
| Rain days | 10 | 12 | 11 |
More details for October
- Daylight
- 11 h 2 min07:17 – 18:20
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 64 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/Toronto
How the score comes together
- Temperatureweight 50 %53 %
- Sunshineweight 20 %20 %
- Few rainy daysweight 30 %45 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Ottawa in October: quick answers
Is Ottawa hot in October?
No. In October, Ottawa is cool: daytime highs average 13 °C and nights drop to about 6 °C.
Does it rain much in Ottawa in October?
Rain is frequent, with about 12 rainy days and 98 mm in total.
Ottawa month by month
The whole year in OttawaAll destinations: CanadaWhere to go in October
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences