September Weather in Peterborough, Canada

Last updated: June 18, 2025

In Peterborough, Canada, the average temperature in September hovers around 17°C (62°F). Temperatures can vary significantly, dipping as low as 1°C (34°F) and soaring up to 32°C (90°F). Expect approximately 82 mm (3.2 in) of precipitation spread over 9 days, accompanied by an average humidity level of 74%.

September Temperature in Peterborough

In September, in Peterborough, the average temperature is 17°C (62°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop to as low as 1°C (34°F). This makes Peterborough an ideal destination for travelers seeking a range of experiences, from warm days to cool, refreshing nights.

September Weather in Peterborough: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Peterborough, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Peterborough, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec212330425665716962503627
Data source: Temperature data for Peterborough 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.

September Precipitation in Peterborough

In Peterborough in September, the total precipitation amount is 82 mm (3.2 in), occurring over a span of 9 days.

September Precipitation Trends in Peterborough

The chart displays monthly precipitation patterns in Peterborough, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Peterborough, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec6772651161059993118821118574
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Peterborough

In Peterborough in September, humidity is 74%. With an average temperature of 17°C (62°F), this humidity feels like a warm blanket enveloping you, making travel slightly uncomfortable as it can cause perspiration and a heavy feeling in the air, especially during outdoor activities.

September Average Humidity in Peterborough

This chart illustrates the average monthly humidity levels in Peterborough, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Peterborough is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%94%87%82%74%68%67%67%74%83%89%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Peterborough

In Peterborough in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Peterborough.

Maximum UV Index Levels in Peterborough for September

The chart shows the monthly maximum UV Index (UVI) for Peterborough in September, 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 September, the maximum UV index in Peterborough typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Peterborough September 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 September Weather in Peterborough Compares to Other Months

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

This table compares monthly weather conditions in Peterborough, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)67 mm (2.7 inches)93%low
February Weather-5°C (23°F)72 mm (2.8 inches)94%moderate
March Weather-1°C (31°F)65 mm (2.6 inches)87%moderate
April Weather6°C (42°F)116 mm (4.6 inches)82%very high
May Weather13°C (56°F)105 mm (4.1 inches)74%very high
June Weather19°C (66°F)99 mm (3.9 inches)68%very high
July Weather22°C (72°F)93 mm (3.7 inches)67%very high
August Weather21°C (69°F)118 mm (4.6 inches)67%very high
September Weather17°C (62°F)82 mm (3.2 inches)74%high
October Weather10°C (50°F)110 mm (4.4 inches)83%moderate
November Weather2°C (36°F)85 mm (3.3 inches)89%moderate
December Weather-3°C (27°F)74 mm (2.9 inches)91%low

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