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September Weather in Cass Lake, United States

Last updated: June 24, 2025

In Cass Lake, United States, the average temperature in September hovers around 15°C (59°F), with a minimum reaching 0°C (32°F) and a maximum soaring to 29°C (84°F). Expect about 109 mm (4.3 in) of precipitation spread across 13 days, contributing to a relatively high average humidity of 77%.

September Temperature in Cass Lake

In September in Cass Lake, the average temperature is 15°C (59°F). Maximums can reach 29°C (84°F), while minimums can drop as low as 0°C (32°F). This creates a diverse climate that is suitable for both warm-weather activities and cooler excursions, making it an ideal time for travelers to explore.

September Weather in Cass Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cass Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cass Lake, September typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (84°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec10927375366716759442717
Data source: Temperature data for Cass Lake 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 Cass Lake

In Cass Lake in September, the precipitation amount is 109 mm (4.3 in), which occurs during 13 days.

September Precipitation Trends in Cass Lake

The chart displays monthly precipitation patterns in Cass Lake, 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 Cass Lake, September typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec2225275851758573109983147
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cass Lake

In Cass Lake in September, humidity is 77%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it essential to stay hydrated and choose light, breathable clothing for comfortable travel.

September Average Humidity in Cass Lake

This chart illustrates the average monthly humidity levels in Cass Lake, 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 Cass Lake is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%93%88%83%76%76%76%77%77%82%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cass Lake

In Cass Lake 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 Cass Lake.

Maximum UV Index Levels in Cass Lake for September

The chart shows the monthly maximum UV Index (UVI) for Cass Lake 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 Cass Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789987432
Data source: Cass Lake 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 Cass Lake Compares to Other Months

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

This table compares monthly weather conditions in Cass Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-12°C (10°F)22 mm (0.9 inches)92%low
February Weather-13°C (10°F)25 mm (1.0 inches)93%moderate
March Weather-3°C (27°F)27 mm (1.1 inches)88%moderate
April Weather3°C (37°F)58 mm (2.3 inches)83%high
May Weather12°C (53°F)51 mm (2.0 inches)76%very high
June Weather19°C (66°F)75 mm (2.9 inches)76%very high
July Weather21°C (71°F)85 mm (3.3 inches)76%very high
August Weather20°C (67°F)73 mm (2.9 inches)77%very high
September Weather15°C (59°F)109 mm (4.3 inches)77%high
October Weather7°C (44°F)98 mm (3.8 inches)82%moderate
November Weather-3°C (28°F)31 mm (1.2 inches)87%moderate
December Weather-8°C (17°F)47 mm (1.9 inches)89%low

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