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September Weather in Cascade, United States

Last updated: June 24, 2025

In Cascade, United States, the average temperature in September hovers around 19°C (66°F). However, be prepared for fluctuations; temperatures can dip as low as 2°C (36°F) and soar to a maximum of 33°C (91°F). Rainfall is noteworthy, with an average precipitation amount of 123 mm (4.8 in) spread over 10 days. Expect a cozy atmosphere with average humidity levels at 74%!

September Temperature in Cascade

In September in Cascade, the average temperature is 19°C (66°F), with maximums reaching up to 33°C (91°F) and minimums dipping as low as 2°C (36°F). This makes it a great time for travelers to enjoy a mix of warm days and cool nights, perfect for exploring the local sights.

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 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec212337476172757266523730
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 total precipitation amount is 123 mm (4.8 in) over the course of 10 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 123 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4960678415512485891231264944
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Cascade

In Cascade in September humidity is 74%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it ideal for leisurely outdoor exploration but potentially heavy for those not accustomed to tropical conditions.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
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.
JanFebMarAprMayJunJulAugSepOctNovDec34589111098533
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-6°C (21°F)49 mm (1.9 inches)84%moderate
February Weather-5°C (23°F)60 mm (2.4 inches)85%moderate
March Weather3°C (37°F)67 mm (2.6 inches)84%moderate
April Weather8°C (47°F)84 mm (3.3 inches)83%very high
May Weather16°C (61°F)155 mm (6.1 inches)75%very high
June Weather22°C (72°F)124 mm (4.9 inches)79%extreme
July Weather24°C (75°F)85 mm (3.3 inches)75%very high
August Weather22°C (72°F)89 mm (3.5 inches)69%very high
September Weather19°C (66°F)123 mm (4.8 inches)74%very high
October Weather11°C (52°F)126 mm (5.0 inches)79%moderate
November Weather3°C (37°F)49 mm (1.9 inches)88%moderate
December Weather-1°C (30°F)44 mm (1.7 inches)82%moderate

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