September Weather in Bethel, United States

Last updated: June 24, 2025

In Bethel, United States, the average temperature in September hovers around 20°C (68°F), creating a comfortable atmosphere for outdoor activities. However, temperatures can fluctuate, with a minimum of 6°C (44°F) and a maximum hitting 33°C (92°F). During this period, expect about 106 mm (4.2 in) of precipitation spread over 10 days, contributing to an average humidity of 68%. Whether you’re planning a visit or simply curious, this climate offers a unique blend of warmth and refreshing rain!

September Temperature in Bethel

In September in Bethel, the average temperature is 20°C (68°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as 6°C (44°F). Be prepared for a pleasant mix of warm days and cooler evenings, making it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Bethel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethel, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Bethel

In Bethel in September, the precipitation amount is 106 mm (4.2 in) over a span of 10 days.

September Precipitation Trends in Bethel

The chart displays monthly precipitation patterns in Bethel, 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, September typically receives around 106 mm (4.2 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 Bethel

In Bethel in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Bethel

This chart illustrates the average monthly humidity levels in Bethel, 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 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 Bethel

In Bethel 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.

Maximum UV Index Levels in Bethel for September

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

Data source: Bethel 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 Compares to Other Months

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

This table compares monthly weather conditions in Bethel, 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)	69 mm (2.7 inches)	84%	moderate
February Weather	1°C (35°F)	102 mm (4.0 inches)	82%	moderate
March Weather	4°C (40°F)	92 mm (3.6 inches)	81%	high
April Weather	10°C (50°F)	120 mm (4.7 inches)	78%	very high
May Weather	15°C (60°F)	112 mm (4.4 inches)	69%	very high
June Weather	21°C (70°F)	94 mm (3.7 inches)	69%	very high
July Weather	24°C (76°F)	129 mm (5.1 inches)	62%	very high
August Weather	23°C (75°F)	110 mm (4.3 inches)	65%	very high
September Weather	20°C (68°F)	106 mm (4.2 inches)	68%	very high
October Weather	14°C (58°F)	139 mm (5.5 inches)	74%	high
November Weather	7°C (45°F)	92 mm (3.6 inches)	82%	moderate
December Weather	2°C (37°F)	114 mm (4.5 inches)	80%	low