September Weather in Bend, United States

Last updated: June 24, 2025

In Bend, United States, the average temperature in September hovers around 24°C (76°F). However, be prepared for temperature fluctuations, with minima dropping to 7°C (45°F) and maxima soaring up to 43°C (109°F). During this month, expect a modest precipitation amount of 8 mm (0.3 in) over the course of 1 day, paired with an average humidity of 46%.

September Temperature in Bend

In September in Bend, the average temperature is 24°C (76°F), with maximums reaching 43°C (109°F) and minimums dropping as low as 7°C (45°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both hot and cool conditions.

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

The chart illustrates September temperature patterns in Bend, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bend, September typically has an average temperature of 24°C (76°F), with highs reaching up to 43°C (109°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Bend

In Bend in September, the precipitation amount is 8 mm (0.3 in) over the course of 1 day.

September Precipitation Trends in Bend

The chart displays monthly precipitation patterns in Bend, 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 Bend, September typically receives around 8 mm (0.3 inches) of precipitation spread over approximately 1 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 Bend

In Bend in September humidity is 46%. With an average temperature of 24°C (76°F), this humidity feels like a warm embrace, making it quite pleasant for exploring the surroundings and enjoying outdoor activities without feeling overly sticky or uncomfortable.

September Average Humidity in Bend

This chart illustrates the average monthly humidity levels in Bend, 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 Bend is approximately 46%, 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 Bend

In Bend in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Bend.

Maximum UV Index Levels in Bend for September

The chart shows the monthly maximum UV Index (UVI) for Bend 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 Bend typically reaches 9, which falls under the very high exposure category.

Data source: Bend 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 Bend Compares to Other Months

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

This table compares monthly weather conditions in Bend, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	137 mm (5.4 inches)	86%	moderate
February Weather	10°C (51°F)	127 mm (5.0 inches)	87%	moderate
March Weather	12°C (54°F)	126 mm (5.0 inches)	86%	high
April Weather	16°C (61°F)	59 mm (2.3 inches)	83%	very high
May Weather	21°C (70°F)	37 mm (1.5 inches)	72%	very high
June Weather	26°C (80°F)	7 mm (0.3 inches)	67%	extreme
July Weather	30°C (86°F)	0 mm (0.0 inches)	56%	very high
August Weather	29°C (84°F)	1 mm (0.0 inches)	42%	very high
September Weather	24°C (76°F)	8 mm (0.3 inches)	46%	very high
October Weather	18°C (65°F)	39 mm (1.5 inches)	67%	high
November Weather	13°C (55°F)	69 mm (2.7 inches)	86%	moderate
December Weather	9°C (48°F)	101 mm (4.0 inches)	86%	low