September Weather in Cascade, United States

Last updated: June 24, 2025

In September, the average temperature in Cascade, United States hovers around 14°C (58°F). Expect a range of conditions, with minimums dipping to -3°C (26°F) and maximums soaring up to 34°C (94°F). The region receives an average precipitation of 41 mm (1.6 in) over approximately 6 days, accompanied by an average humidity level of 68%.

September Temperature in Cascade

In September in Cascade, the average temperature is 14°C (58°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as -3°C (26°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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 14°C (58°F), with highs reaching up to 34°C (94°F) and lows dropping to around -3°C (26°F).

Data source: Temperature data for Cascade generated using information from the Copernicus Climate Change Service.

September Precipitation in Cascade

In Cascade in September, the precipitation amount is 41 mm (1.6 in) over the course of 6 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 41 mm (1.6 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Cascade

In Cascade in September, humidity is 68%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making it a bit challenging for traveling. The air feels heavy, and you may find yourself needing to take breaks more often as you explore the sights.

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 68%, offering insight into how humid the weather typically is during this month.

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 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 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	16 mm (0.6 inches)	87%	low
February Weather	-7°C (19°F)	40 mm (1.6 inches)	88%	moderate
March Weather	0°C (33°F)	29 mm (1.1 inches)	83%	moderate
April Weather	5°C (41°F)	64 mm (2.5 inches)	78%	very high
May Weather	11°C (52°F)	81 mm (3.2 inches)	76%	very high
June Weather	16°C (62°F)	96 mm (3.8 inches)	78%	very high
July Weather	21°C (70°F)	15 mm (0.6 inches)	77%	very high
August Weather	20°C (68°F)	27 mm (1.1 inches)	71%	very high
September Weather	14°C (58°F)	41 mm (1.6 inches)	68%	high
October Weather	6°C (43°F)	40 mm (1.6 inches)	72%	moderate
November Weather	1°C (35°F)	30 mm (1.2 inches)	84%	moderate
December Weather	-3°C (28°F)	27 mm (1.1 inches)	90%	low