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September Weather in Princeton, Canada

Last updated: June 18, 2025

In September, the average temperature in Princeton, Canada hovers around 10°C (50°F). Be prepared for a range, as the mercury can dip to a chilly -3°C (27°F) or rise to a warm 28°C (83°F). Expect some rain too, with an average precipitation of 52 mm (2.1 in) over about 9 days. You'll likely feel the dampness with an average humidity of 76%.

September Temperature in Princeton

In September in Princeton, the average temperature is 10°C (50°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as -3°C (27°F). This diverse temperature range makes Princeton an ideal destination for travelers seeking a mix of seasonal experiences.

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

The chart illustrates September temperature patterns in Princeton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Princeton, September typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec252130374652585850373225
Data source: Temperature data for Princeton 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 Princeton

In Princeton in September, the total precipitation amount is 52 mm (2.1 in) over the course of 9 days.

September Precipitation Trends in Princeton

The chart displays monthly precipitation patterns in Princeton, 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 Princeton, September typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec84886458474420175288124114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Princeton

In Princeton in September, humidity is 76%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps through your clothes, making outdoor activities quite uncomfortable and necessitating a layer of warmth for traveling.

September Average Humidity in Princeton

This chart illustrates the average monthly humidity levels in Princeton, 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 Princeton is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Princeton

In Princeton 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 Princeton.

Maximum UV Index Levels in Princeton for September

The chart shows the monthly maximum UV Index (UVI) for Princeton 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 Princeton typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235799997521
Data source: Princeton 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 Princeton Compares to Other Months

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

This table compares monthly weather conditions in Princeton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)83 mm (3.3 inches)87%low
February Weather-6°C (21°F)88 mm (3.5 inches)86%moderate
March Weather-1°C (30°F)64 mm (2.5 inches)88%moderate
April Weather3°C (37°F)58 mm (2.3 inches)86%high
May Weather8°C (47°F)47 mm (1.8 inches)82%very high
June Weather11°C (52°F)44 mm (1.7 inches)82%very high
July Weather14°C (58°F)20 mm (0.8 inches)85%very high
August Weather14°C (58°F)17 mm (0.7 inches)77%very high
September Weather10°C (50°F)52 mm (2.1 inches)76%high
October Weather3°C (38°F)88 mm (3.5 inches)88%moderate
November Weather0°C (32°F)124 mm (4.9 inches)88%low
December Weather-4°C (25°F)114 mm (4.5 inches)89%low

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