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September Weather in Nepean, Canada

Last updated: June 18, 2025

In September, the average temperature in Nepean, Canada is a mild 16°C (61°F). Expect a range from a refreshing 0°C (32°F) to a warm 33°C (92°F). During this time, you can anticipate 66 mm (2.6 in) of precipitation spread over 9 days, along with an average humidity level of 72%. Prepare accordingly!

September Temperature in Nepean

In September in Nepean, the average temperature is 16°C (61°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 0°C (32°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Nepean, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nepean, September typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (92°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec172028435665716961493424
Data source: Temperature data for Nepean 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 Nepean

In Nepean in September, the precipitation amount is 66 mm (2.6 in) over the course of 9 days.

September Precipitation Trends in Nepean

The chart displays monthly precipitation patterns in Nepean, 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 Nepean, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7478841151119211289661319477
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nepean

In Nepean in September humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

September Average Humidity in Nepean

This chart illustrates the average monthly humidity levels in Nepean, 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 Nepean is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%86%82%75%68%69%67%72%83%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nepean

In Nepean 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 Nepean.

Maximum UV Index Levels in Nepean for September

The chart shows the monthly maximum UV Index (UVI) for Nepean 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 Nepean typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899987532
Data source: Nepean 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 Nepean Compares to Other Months

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

This table compares monthly weather conditions in Nepean, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)74 mm (2.9 inches)93%low
February Weather-7°C (20°F)78 mm (3.1 inches)93%moderate
March Weather-2°C (29°F)84 mm (3.3 inches)86%moderate
April Weather6°C (43°F)115 mm (4.5 inches)82%very high
May Weather13°C (57°F)111 mm (4.4 inches)75%very high
June Weather19°C (66°F)92 mm (3.6 inches)68%very high
July Weather22°C (72°F)112 mm (4.4 inches)69%very high
August Weather20°C (69°F)89 mm (3.5 inches)67%very high
September Weather16°C (61°F)66 mm (2.6 inches)72%high
October Weather10°C (49°F)131 mm (5.1 inches)83%moderate
November Weather1°C (34°F)94 mm (3.7 inches)88%moderate
December Weather-5°C (24°F)77 mm (3.0 inches)89%low

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