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September Weather in Chilliwack, Canada

Last updated: June 18, 2025

In Chilliwack, Canada, the average temperature in September hovers around 13°C (56°F). Be prepared for a range of temperatures, with lows dipping to 4°C (40°F) and highs reaching up to 31°C (88°F). Expect heavy precipitation totaling 187 mm (7.4 in) over about 15 days, while humidity is comfortably high at 76%.

September Temperature in Chilliwack

In September in Chilliwack, the average temperature is 13°C (56°F). Maximums can reach 31°C (88°F), and minimums can be as low as 4°C (40°F). Be prepared for a wide range of temperatures during your travels.

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

The chart illustrates September temperature patterns in Chilliwack, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chilliwack, September typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (88°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec323037435256616256453832
Data source: Temperature data for Chilliwack 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 Chilliwack

In Chilliwack in September, the precipitation amount is 187 mm (7.4 in) over a span of 15 days.

September Precipitation Trends in Chilliwack

The chart displays monthly precipitation patterns in Chilliwack, 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 Chilliwack, September typically receives around 187 mm (7.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec305272236181103965642187292435346
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chilliwack

In Chilliwack in September humidity is 76%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making travel a bit uncomfortable as you navigate through the heavy, moisture-laden air.

September Average Humidity in Chilliwack

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

In Chilliwack in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Chilliwack, you can refer to this Hourly UV Index in Chilliwack.

Maximum UV Index Levels in Chilliwack for September

The chart shows the monthly maximum UV Index (UVI) for Chilliwack 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 Chilliwack typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Chilliwack 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 Chilliwack Compares to Other Months

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

This table compares monthly weather conditions in Chilliwack, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)305 mm (12.0 inches)87%low
February Weather-1°C (30°F)272 mm (10.7 inches)86%moderate
March Weather3°C (37°F)236 mm (9.3 inches)88%moderate
April Weather6°C (43°F)181 mm (7.1 inches)86%high
May Weather11°C (52°F)103 mm (4.1 inches)82%very high
June Weather13°C (56°F)95 mm (3.8 inches)82%very high
July Weather16°C (62°F)56 mm (2.2 inches)85%very high
August Weather17°C (62°F)42 mm (1.7 inches)77%very high
September Weather13°C (56°F)187 mm (7.4 inches)76%high
October Weather7°C (45°F)292 mm (11.5 inches)88%moderate
November Weather4°C (39°F)435 mm (17.1 inches)88%low
December Weather0°C (33°F)346 mm (13.6 inches)89%low

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