Ottawa weather in October
October in Ottawa: cool, rainy, with clean air — a great time to visit.
#6 of 12 months in Ottawa · #635 of 897 destinations to visit in October · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ottawa in October
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Ottawa climate normals — October
| Daytime high | 15°C / 58°F | 🙂 cool |
|---|---|---|
| Nighttime low | 7°C / 45°F | |
| Rainfall | 107 mm / 4.2 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 6 h/day | |
| Daylight | 10.9 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 1 cm / 0.4 in | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ottawa in October — FAQ
- Is October a good time to visit Ottawa?
- October in Ottawa: cool, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Ottawa on SeasonMap's comfort score (71/100).
- What is the weather like in Ottawa in October?
- In October, Ottawa averages a daily high of 14.6°C and a low of 7.3°C, with about 106.8 mm of rain over roughly 13 rainy days.
- What is the air quality in Ottawa in October?
- Ottawa has a mean US Air Quality Index of about 30 in October.
- Does it snow in Ottawa in October?
- Ottawa sees roughly 1 cm of snowfall in October.