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October Weather in Ottawa, United States

Last updated: June 24, 2025

In October, the average temperature in Ottawa, United States hovers around 13°C (56°F). However, residents and visitors alike may experience a minimum of -5°C (24°F) or a sweltering maximum of 32°C (89°F). Expect precipitation to amount to 134 mm (5.3 in) over 12 days, with the air lingering at a humidity level of 82%. Stay prepared for diverse weather as you enjoy the unique charm of Ottawa!

October Temperature in Ottawa

In October in Ottawa, the average temperature is 13°C (56°F). Maximums can reach 32°C (89°F), while minimums can drop as low as -5°C (24°F). If you're planning to travel, be prepared for a wide range of temperatures and pack accordingly.

October Weather in Ottawa: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Ottawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottawa, October typically has an average temperature of 13°C (56°F), with highs reaching up to 32°C (89°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec262841506373767369554034
Data source: Temperature data for Ottawa generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Ottawa

In Ottawa in October, the precipitation amount is 134 mm (5.3 in) over a period of 12 days.

October Precipitation Trends in Ottawa

The chart displays monthly precipitation patterns in Ottawa, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Ottawa, October typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec62669311716514510187911345755
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Ottawa

In Ottawa in October, humidity is 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

October Average Humidity in Ottawa

This chart illustrates the average monthly humidity levels in Ottawa, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Ottawa is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Ottawa

In Ottawa in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Ottawa, you can refer to this Hourly UV Index in Ottawa.

Maximum UV Index Levels in Ottawa for October

The chart shows the monthly maximum UV Index (UVI) for Ottawa in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Ottawa typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Ottawa October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Ottawa Compares to Other Months

Weather in Ottawa varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Ottawa, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Ottawa, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)62 mm (2.5 inches)82%moderate
February Weather-2°C (28°F)66 mm (2.6 inches)83%moderate
March Weather5°C (41°F)93 mm (3.7 inches)84%high
April Weather10°C (50°F)117 mm (4.6 inches)85%very high
May Weather17°C (63°F)165 mm (6.5 inches)79%very high
June Weather23°C (73°F)145 mm (5.7 inches)82%very high
July Weather24°C (76°F)101 mm (4.0 inches)80%very high
August Weather23°C (74°F)87 mm (3.4 inches)81%very high
September Weather20°C (69°F)91 mm (3.6 inches)80%very high
October Weather13°C (56°F)134 mm (5.3 inches)82%high
November Weather4°C (40°F)57 mm (2.2 inches)88%moderate
December Weather1°C (34°F)55 mm (2.2 inches)84%low

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