September Weather in Bethel Park, United States

Last updated: June 24, 2025

In September, the average temperature in Bethel Park, United States hovers around 20°C (68°F), offering a pleasant climate. However, be prepared for variability, as temperatures can dip to a chilly 4°C (40°F) or soar to a sweltering 34°C (93°F). Rain is also a factor, with an expected 128 mm (5.1 in) of precipitation spread over about 9 days, contributing to an average humidity of 77%. Enjoy the mix of conditions this month!

September Temperature in Bethel Park

In September in Bethel Park, the average temperature is 20°C (68°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 4°C (40°F). This variety in temperature makes it a great time for travelers to enjoy both outdoor activities and cozy indoor experiences.

September Weather in Bethel Park: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bethel Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethel Park, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Bethel Park

In Bethel Park in September, the precipitation amount is 128 mm (5.1 in) over the course of 9 days.

September Precipitation Trends in Bethel Park

The chart displays monthly precipitation patterns in Bethel Park, 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 Bethel Park, September typically receives around 128 mm (5.1 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Bethel Park

In Bethel Park in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

September Average Humidity in Bethel Park

This chart illustrates the average monthly humidity levels in Bethel Park, 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 Bethel Park is approximately 77%, 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 Bethel Park

In Bethel Park 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 Bethel Park.

Maximum UV Index Levels in Bethel Park for September

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

Data source: Bethel Park 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 Bethel Park Compares to Other Months

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

This table compares monthly weather conditions in Bethel Park, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	90 mm (3.5 inches)	88%	moderate
February Weather	2°C (36°F)	124 mm (4.9 inches)	88%	moderate
March Weather	6°C (42°F)	114 mm (4.5 inches)	87%	high
April Weather	11°C (52°F)	130 mm (5.1 inches)	87%	very high
May Weather	17°C (63°F)	150 mm (5.9 inches)	81%	very high
June Weather	21°C (70°F)	166 mm (6.5 inches)	83%	very high
July Weather	24°C (75°F)	156 mm (6.1 inches)	82%	very high
August Weather	23°C (73°F)	97 mm (3.8 inches)	76%	very high
September Weather	20°C (68°F)	128 mm (5.1 inches)	77%	very high
October Weather	14°C (58°F)	125 mm (4.9 inches)	82%	high
November Weather	6°C (43°F)	90 mm (3.5 inches)	89%	moderate
December Weather	3°C (37°F)	109 mm (4.3 inches)	86%	low