nomadseason

September Weather in Napanee, Canada

Last updated: June 18, 2025

In September, the average temperature in Napanee, Canada is a comfortable 17°C (63°F). Expect a range that can dip to a cool 2°C (36°F) and rise as high as a warm 32°C (90°F). With an average humidity of 72%, you might encounter some moisture in the air. Be prepared for 72 mm (2.8 in) of precipitation spread across 8 days, making it a good time to bring along an umbrella!

September Temperature in Napanee

In September in Napanee, the average temperature is 17°C (63°F). Maximum temperatures can reach 32°C (90°F), while the minimum can drop as low as 2°C (36°F). This makes Napanee a great destination for travelers seeking a variety of weather experiences, from warm days to cooler evenings.

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

The chart illustrates September temperature patterns in Napanee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Napanee, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec222432435666727063513728
Data source: Temperature data for Napanee generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Napanee

In Napanee in September, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.

September Precipitation Trends in Napanee

The chart displays monthly precipitation patterns in Napanee, 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 Napanee, September typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec71737012096909590721379485
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Napanee

In Napanee in September, humidity is 72%. With an average temperature of 17°C (63°F), this humidity feels like a muggy embrace, making outdoor activities a bit sticky and requiring plenty of hydration for a comfortable travel experience.

September Average Humidity in Napanee

This chart illustrates the average monthly humidity levels in Napanee, 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 Napanee 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 Napanee

In Napanee 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 Napanee.

Maximum UV Index Levels in Napanee for September

The chart shows the monthly maximum UV Index (UVI) for Napanee 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 Napanee typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899997532
Data source: Napanee 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 Napanee Compares to Other Months

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

This table compares monthly weather conditions in Napanee, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)71 mm (2.8 inches)93%low
February Weather-4°C (24°F)73 mm (2.9 inches)93%moderate
March Weather0°C (32°F)70 mm (2.8 inches)86%moderate
April Weather6°C (44°F)120 mm (4.7 inches)82%very high
May Weather14°C (57°F)95 mm (3.8 inches)75%very high
June Weather19°C (66°F)90 mm (3.5 inches)68%very high
July Weather22°C (73°F)95 mm (3.7 inches)69%very high
August Weather21°C (71°F)90 mm (3.6 inches)67%very high
September Weather17°C (63°F)72 mm (2.8 inches)72%high
October Weather11°C (52°F)137 mm (5.4 inches)83%moderate
November Weather3°C (38°F)94 mm (3.7 inches)88%moderate
December Weather-2°C (28°F)85 mm (3.4 inches)89%low

Compare Napanee's Climate with Cities Worldwide