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September Weather in Cascade, United States

Last updated: June 24, 2025

In September, the average temperature in Cascade, United States hovers around 13°C (55°F), with a wide range between a chilly -5°C (22°F) at its lowest and a warm 32°C (89°F) at its peak. Expect 43 mm (1.7 in) of precipitation over about 5 days, contributing to an average humidity of 60%. Whether you’re packing for cool breezes or warm afternoons, be prepared for a mix of weather!

September Temperature in Cascade

In September in Cascade, the average temperature is 13°C (55°F). The maximum can reach 32°C (89°F), and the minimum can be as low as -5°C (22°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Cascade, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cascade, September typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (89°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec242432374556666555403023
Data source: Temperature data for Cascade 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 Cascade

In Cascade in September, the precipitation amount is 43 mm (1.7 in) over the course of 5 days.

September Precipitation Trends in Cascade

The chart displays monthly precipitation patterns in Cascade, 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 Cascade, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec1191631159785669224371101109
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cascade

In Cascade in September, humidity is 60%. With an average temperature of 13°C (55°F), this humidity feels like a cool, crisp embrace that makes traveling invigorating yet refreshing, perfect for exploring without overheating.

September Average Humidity in Cascade

This chart illustrates the average monthly humidity levels in Cascade, 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 Cascade is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%91%88%84%77%78%78%63%60%77%86%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cascade

In Cascade in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Cascade.

Maximum UV Index Levels in Cascade for September

The chart shows the monthly maximum UV Index (UVI) for Cascade 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 Cascade typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111108642
Data source: Cascade 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 Cascade Compares to Other Months

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

This table compares monthly weather conditions in Cascade, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)119 mm (4.7 inches)90%moderate
February Weather-4°C (24°F)163 mm (6.4 inches)91%moderate
March Weather0°C (32°F)114 mm (4.5 inches)88%high
April Weather3°C (37°F)97 mm (3.8 inches)84%very high
May Weather7°C (45°F)85 mm (3.4 inches)77%very high
June Weather13°C (56°F)65 mm (2.6 inches)78%extreme
July Weather19°C (67°F)9 mm (0.3 inches)77%extreme
August Weather18°C (65°F)21 mm (0.8 inches)63%very high
September Weather13°C (55°F)43 mm (1.7 inches)60%very high
October Weather4°C (40°F)71 mm (2.8 inches)77%high
November Weather-1°C (30°F)101 mm (4.0 inches)86%moderate
December Weather-5°C (23°F)109 mm (4.3 inches)89%low

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