September Weather in Berne, United States

Last updated: June 24, 2025

The average temperature in Berne, United States for the month of September is a pleasant 20°C (69°F). Expect variability, with minimums dipping to 4°C (39°F) and maximums soaring to 33°C (92°F). During this time, precipitation averages 68 mm (2.7 in) over approximately 8 days, and you'll experience an average humidity of 78%. Stay prepared for a mix of warm days and occasional rain!

September Temperature in Berne

In September in Berne, the average temperature is 20°C (69°F). Maximums can reach 33°C (92°F), while minimums can drop to as low as 4°C (39°F). This variation in temperature makes it a perfect time for travelers to enjoy a mix of warm days and cooler nights, allowing for comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Berne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Berne, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Berne

In Berne in September, the precipitation amount is 68 mm (2.7 in) spread over 8 days.

September Precipitation Trends in Berne

The chart displays monthly precipitation patterns in Berne, 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 Berne, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 8 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 Berne

In Berne in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Berne

This chart illustrates the average monthly humidity levels in Berne, 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 Berne is approximately 78%, 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 Berne

In Berne 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 Berne.

Maximum UV Index Levels in Berne for September

The chart shows the monthly maximum UV Index (UVI) for Berne 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 Berne typically reaches 8, which falls under the very high exposure category.

Data source: Berne 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 Berne Compares to Other Months

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

This table compares monthly weather conditions in Berne, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	74 mm (2.9 inches)	85%	moderate
February Weather	0°C (32°F)	83 mm (3.3 inches)	85%	moderate
March Weather	5°C (41°F)	100 mm (4.0 inches)	86%	high
April Weather	10°C (51°F)	91 mm (3.6 inches)	87%	very high
May Weather	17°C (63°F)	124 mm (4.9 inches)	81%	very high
June Weather	22°C (73°F)	114 mm (4.5 inches)	82%	very high
July Weather	25°C (76°F)	102 mm (4.0 inches)	81%	very high
August Weather	23°C (74°F)	99 mm (3.9 inches)	79%	very high
September Weather	20°C (69°F)	68 mm (2.7 inches)	78%	very high
October Weather	14°C (57°F)	98 mm (3.9 inches)	81%	high
November Weather	5°C (42°F)	82 mm (3.2 inches)	89%	moderate
December Weather	2°C (35°F)	64 mm (2.5 inches)	86%	low