nomadseason

September Weather in Casselman, Canada

Last updated: June 18, 2025

In September, the average temperature in Casselman, Canada hovers around 16°C (61°F). Expect a range where temperatures can dip as low as 0°C (31°F) and soar up to 32°C (90°F). During this month, you'll encounter around 75 mm (2.9 in) of precipitation spread over 9 days, contributing to the average humidity of 72%.

September Temperature in Casselman

In September in Casselman, the average temperature is 16°C (61°F). Maximums can reach 32°C (90°F) while minimums can drop to 0°C (31°F). Pack for both warm days and chilly nights to make the most of your trip!

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

The chart illustrates September temperature patterns in Casselman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casselman, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec182029435766716961503424
Data source: Temperature data for Casselman 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 Casselman

In Casselman, in September, the precipitation amount is 75 mm (2.9 in) spread over the course of 9 days.

September Precipitation Trends in Casselman

The chart displays monthly precipitation patterns in Casselman, 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 Casselman, September typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec818390118113101118977513410184
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Casselman

In Casselman 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 Casselman

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

In Casselman 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 Casselman.

Maximum UV Index Levels in Casselman for September

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

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

This table compares monthly weather conditions in Casselman, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)81 mm (3.2 inches)93%low
February Weather-7°C (20°F)83 mm (3.3 inches)93%moderate
March Weather-2°C (29°F)90 mm (3.5 inches)86%moderate
April Weather6°C (43°F)118 mm (4.6 inches)82%very high
May Weather14°C (57°F)113 mm (4.4 inches)75%very high
June Weather19°C (66°F)101 mm (4.0 inches)68%very high
July Weather22°C (72°F)118 mm (4.6 inches)69%very high
August Weather21°C (69°F)97 mm (3.8 inches)67%very high
September Weather16°C (61°F)75 mm (2.9 inches)72%high
October Weather10°C (50°F)134 mm (5.3 inches)83%moderate
November Weather1°C (34°F)101 mm (4.0 inches)88%moderate
December Weather-5°C (24°F)84 mm (3.3 inches)89%low

Compare Casselman's Climate with Cities Worldwide