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September Weather in Grand Falls-Windsor, Canada

Last updated: June 18, 2025

In Grand Falls-Windsor, Canada, the average temperature in September hovers around 13°C (55°F). Be prepared for a chilly range with minimums dipping to -3°C (27°F) and maximums soaring to 26°C (80°F). Expect about 100 mm (3.9 in) of precipitation spread across 12 days, contributing to an average humidity of 89%.

September Temperature in Grand Falls-Windsor

In September in Grand Falls-Windsor, the average temperature is 13°C (55°F). Maximums can reach 26°C (80°F) and minimums can be as low as -3°C (27°F). This climate makes Grand Falls-Windsor an ideal destination for travelers seeking a mix of mild and brisk weather experiences.

September Weather in Grand Falls-Windsor: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grand Falls-Windsor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Falls-Windsor, September typically has an average temperature of 13°C (55°F), with highs reaching up to 26°C (80°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec211926354455626455453628
Data source: Temperature data for Grand Falls-Windsor 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 Grand Falls-Windsor

In Grand Falls-Windsor in September, the precipitation amount is 100 mm (3.9 in) over the course of 12 days.

September Precipitation Trends in Grand Falls-Windsor

The chart displays monthly precipitation patterns in Grand Falls-Windsor, 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 Grand Falls-Windsor, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec8594114119103101727910090107118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grand Falls-Windsor

In Grand Falls-Windsor in September humidity is 89%. With an average temperature of 13°C (55°F), this humidity feels like a thick, damp blanket enveloping you, making every step feel heavier and each breath a bit more laborious for traveling.

September Average Humidity in Grand Falls-Windsor

This chart illustrates the average monthly humidity levels in Grand Falls-Windsor, 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 Grand Falls-Windsor is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%90%90%90%87%79%88%90%89%89%87%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grand Falls-Windsor

In Grand Falls-Windsor 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 Grand Falls-Windsor, you can refer to this Hourly UV Index in Grand Falls-Windsor.

Maximum UV Index Levels in Grand Falls-Windsor for September

The chart shows the monthly maximum UV Index (UVI) for Grand Falls-Windsor 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 Grand Falls-Windsor typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356810876421
Data source: Grand Falls-Windsor 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 Grand Falls-Windsor Compares to Other Months

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

This table compares monthly weather conditions in Grand Falls-Windsor, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)85 mm (3.3 inches)88%low
February Weather-7°C (20°F)94 mm (3.7 inches)90%moderate
March Weather-3°C (26°F)114 mm (4.5 inches)89%moderate
April Weather2°C (36°F)119 mm (4.7 inches)90%high
May Weather6°C (44°F)103 mm (4.1 inches)87%very high
June Weather13°C (55°F)101 mm (4.0 inches)79%very high
July Weather17°C (62°F)72 mm (2.8 inches)88%very high
August Weather18°C (64°F)79 mm (3.1 inches)90%high
September Weather13°C (55°F)100 mm (3.9 inches)89%high
October Weather7°C (45°F)90 mm (3.5 inches)88%moderate
November Weather2°C (36°F)107 mm (4.2 inches)87%low
December Weather-2°C (28°F)118 mm (4.6 inches)88%low

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