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September Weather in Granby, Canada

Last updated: June 18, 2025

In September, the average temperature in Granby, Canada hovers around 16°C (60°F). Be prepared for a range, as temperatures can dip to a chilly -3°C (26°F) or soar to a warm 30°C (87°F). During this month, expect about 69 mm (2.7 in) of precipitation spread over 10 days, contributing to an average humidity of 78%. Stay prepared for varying weather conditions!

September Temperature in Granby

In September in Granby, the average temperature is 16°C (60°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -3°C (26°F). It's advisable to pack layers and be prepared for a wide range of weather conditions while exploring this destination.

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

The chart illustrates September temperature patterns in Granby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Granby, September typically has an average temperature of 16°C (60°F), with highs reaching up to 30°C (87°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec182028425665706860493424
Data source: Temperature data for Granby 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 Granby

In Granby in September, the precipitation amount is 69 mm (2.7 in) spread over a period of 10 days.

September Precipitation Trends in Granby

The chart displays monthly precipitation patterns in Granby, 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 Granby, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9184871171021171111156914112285
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Granby

In Granby in September humidity is 78%. With an average temperature of 16°C (60°F), this humidity feels like a damp embrace, making travel a bit uncomfortable as the air clings to your skin and leaves you feeling sticky.

September Average Humidity in Granby

This chart illustrates the average monthly humidity levels in Granby, 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 Granby is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Granby

In Granby 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 Granby.

Maximum UV Index Levels in Granby for September

The chart shows the monthly maximum UV Index (UVI) for Granby 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 Granby typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899887532
Data source: Granby 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 Granby Compares to Other Months

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

This table compares monthly weather conditions in Granby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)91 mm (3.6 inches)93%low
February Weather-7°C (20°F)84 mm (3.3 inches)92%moderate
March Weather-2°C (29°F)87 mm (3.4 inches)86%moderate
April Weather6°C (43°F)117 mm (4.6 inches)85%very high
May Weather13°C (56°F)102 mm (4.0 inches)80%very high
June Weather18°C (65°F)117 mm (4.6 inches)74%very high
July Weather21°C (70°F)111 mm (4.4 inches)76%very high
August Weather20°C (68°F)115 mm (4.5 inches)75%very high
September Weather16°C (60°F)69 mm (2.7 inches)78%high
October Weather10°C (49°F)141 mm (5.5 inches)86%moderate
November Weather1°C (34°F)122 mm (4.8 inches)88%moderate
December Weather-5°C (24°F)85 mm (3.3 inches)89%low

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