September Weather in Bethlehem, United States

Last updated: June 24, 2025

In September, the average temperature in Bethlehem, United States hovers around 23°C (75°F), offering a pleasant climate for visitors. Expect temperatures to range from a cool 10°C (50°F) to a warm 35°C (96°F), depending on the day. This month also sees an average precipitation of 116 mm (4.6 in), typically spread over 10 days, and humidity levels around 82%, adding a touch of tropical feel to your experience. Enjoy the warmth, but be prepared for occasional showers!

September Temperature in Bethlehem

In September, in Bethlehem, the average temperature is 23°C (75°F). Maximums can reach 35°C (96°F) and minimums can be as low as 10°C (50°F). Overall, it's a great time for traveling, offering warm days and cooler nights for comfortable exploration.

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

The chart illustrates September temperature patterns in Bethlehem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethlehem, September typically has an average temperature of 23°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Bethlehem

In Bethlehem in September, the total precipitation amount is 116 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in Bethlehem

The chart displays monthly precipitation patterns in Bethlehem, 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 Bethlehem, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 10 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 Bethlehem

In Bethlehem in September, humidity is 82%. With an average temperature of 23°C (75°F), this humidity feels like a muggy embrace, making travel a bit more challenging as the air clings to your skin and the heat intensifies, often leaving one feeling sluggish and in need of frequent breaks to stay hydrated and refreshed.

September Average Humidity in Bethlehem

This chart illustrates the average monthly humidity levels in Bethlehem, 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 Bethlehem is approximately 82%, 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 Bethlehem

In Bethlehem 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 Bethlehem.

Maximum UV Index Levels in Bethlehem for September

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

Data source: Bethlehem 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 Bethlehem Compares to Other Months

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

This table compares monthly weather conditions in Bethlehem, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (46°F)	108 mm (4.3 inches)	86%	moderate
February Weather	10°C (51°F)	147 mm (5.8 inches)	84%	high
March Weather	13°C (56°F)	130 mm (5.1 inches)	83%	very high
April Weather	17°C (62°F)	123 mm (4.8 inches)	81%	very high
May Weather	21°C (71°F)	125 mm (4.9 inches)	81%	extreme
June Weather	24°C (76°F)	127 mm (5.0 inches)	81%	extreme
July Weather	26°C (79°F)	118 mm (4.7 inches)	83%	extreme
August Weather	26°C (78°F)	147 mm (5.8 inches)	81%	very high
September Weather	23°C (75°F)	116 mm (4.6 inches)	82%	very high
October Weather	19°C (66°F)	141 mm (5.5 inches)	78%	very high
November Weather	11°C (52°F)	80 mm (3.1 inches)	86%	high
December Weather	9°C (48°F)	135 mm (5.3 inches)	89%	moderate