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September Weather in Crystal Falls, United States

Last updated: June 24, 2025

In Crystal Falls, United States, the average temperature in September is a mild 15°C (59°F). Expect a minimum of -2°C (29°F) and a maximum of 33°C (92°F), showcasing the range of seasonal variations. With 95 mm (3.7 in) of precipitation over 11 days, the region experiences notable rainfall, and the average humidity hovers around 78%, creating a unique atmosphere throughout the month.

September Temperature in Crystal Falls

In September in Crystal Falls, the average temperature is 15°C (59°F), with maximums reaching 33°C (92°F) and minimums dropping as low as -2°C (29°F). This wide range of temperatures makes Crystal Falls an exciting destination for travelers looking to experience diverse weather conditions.

September Weather in Crystal Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Crystal Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Crystal Falls, September typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (92°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec161527385465696658453021
Data source: Temperature data for Crystal Falls 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 Crystal Falls

In Crystal Falls in September, the total precipitation amount is 95 mm (3.7 in) spread over 11 days.

September Precipitation Trends in Crystal Falls

The chart displays monthly precipitation patterns in Crystal Falls, 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 Crystal Falls, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec334947877994100114951045355
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Crystal Falls

In Crystal Falls in September, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

September Average Humidity in Crystal Falls

This chart illustrates the average monthly humidity levels in Crystal Falls, 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 Crystal Falls is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Crystal Falls

In Crystal Falls 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 Crystal Falls.

Maximum UV Index Levels in Crystal Falls for September

The chart shows the monthly maximum UV Index (UVI) for Crystal Falls 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 Crystal Falls typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
Data source: Crystal Falls 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 Crystal Falls Compares to Other Months

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

This table compares monthly weather conditions in Crystal Falls, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)33 mm (1.3 inches)89%low
February Weather-9°C (16°F)49 mm (1.9 inches)90%moderate
March Weather-3°C (27°F)47 mm (1.9 inches)87%moderate
April Weather3°C (38°F)87 mm (3.4 inches)84%high
May Weather12°C (54°F)79 mm (3.1 inches)77%very high
June Weather18°C (65°F)94 mm (3.7 inches)75%very high
July Weather21°C (70°F)100 mm (4.0 inches)74%very high
August Weather19°C (66°F)114 mm (4.5 inches)73%very high
September Weather15°C (59°F)95 mm (3.7 inches)78%high
October Weather7°C (45°F)104 mm (4.1 inches)84%moderate
November Weather-1°C (30°F)53 mm (2.1 inches)89%moderate
December Weather-6°C (22°F)55 mm (2.2 inches)87%low

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