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September Weather in Mattawa, Canada

Last updated: June 18, 2025

In Mattawa, Canada, the average temperature in September hovers around 14°C (57°F). Expect a range where the minimum dips to -3°C (27°F) and the maximum rises to 31°C (88°F). During this month, precipitation totals about 105 mm (4.2 in) spread over 12 days, and humidity maintains a level of 76%.

September Temperature in Mattawa

In September in Mattawa, the average temperature is 14°C (57°F), with maximums reaching 31°C (88°F) and minimums dropping as low as -3°C (27°F). It's advisable to pack for a range of weather conditions to fully enjoy your travels.

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

The chart illustrates September temperature patterns in Mattawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mattawa, September typically has an average temperature of 14°C (57°F), with highs reaching up to 31°C (88°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec131524385262686557453019
Data source: Temperature data for Mattawa 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 Mattawa

In Mattawa in September, the precipitation amount is 105 mm (4.2 in) spread over the course of 12 days.

September Precipitation Trends in Mattawa

The chart displays monthly precipitation patterns in Mattawa, 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 Mattawa, September typically receives around 105 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec556661100103106951161061038676
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mattawa

In Mattawa in September humidity is 76%. With an average temperature of 14°C (57°F), this humidity feels like a warm blanket wrapped around you, creating a heavy atmosphere that can make outdoor activities feel sluggish and stifling, urging travelers to seek shade and refreshment more frequently.

September Average Humidity in Mattawa

This chart illustrates the average monthly humidity levels in Mattawa, 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 Mattawa is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%95%89%85%74%67%71%71%76%86%90%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mattawa

In Mattawa 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 Mattawa.

Maximum UV Index Levels in Mattawa for September

The chart shows the monthly maximum UV Index (UVI) for Mattawa 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 Mattawa typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235799987532
Data source: Mattawa 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 Mattawa Compares to Other Months

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

This table compares monthly weather conditions in Mattawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)55 mm (2.2 inches)96%low
February Weather-10°C (15°F)66 mm (2.6 inches)95%moderate
March Weather-4°C (24°F)61 mm (2.4 inches)89%moderate
April Weather3°C (38°F)99 mm (3.9 inches)85%high
May Weather11°C (53°F)103 mm (4.1 inches)74%very high
June Weather17°C (62°F)106 mm (4.2 inches)67%very high
July Weather20°C (68°F)95 mm (3.7 inches)71%very high
August Weather18°C (65°F)116 mm (4.6 inches)71%very high
September Weather14°C (57°F)105 mm (4.2 inches)76%high
October Weather7°C (46°F)103 mm (4.0 inches)86%moderate
November Weather-1°C (31°F)86 mm (3.4 inches)90%moderate
December Weather-7°C (19°F)76 mm (3.0 inches)94%low

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