September Weather in Bethel, United States

Last updated: June 24, 2025

In Bethel, United States, the average temperature in September settles at a mild 17°C (63°F). Daytime highs can soar to a warm 30°C (87°F), while nights may drop to a cooler 8°C (47°F). Expect 90 mm (3.6 in) of precipitation spread over 13 days, contributing to a 74% average humidity that adds to the region's lush atmosphere.

September Temperature in Bethel

In September in Bethel, the average temperature is 17°C (63°F). The maximum can reach 30°C (87°F), while the minimum can be as low as 8°C (47°F). This makes it a great time for travelers to enjoy a mix of warm days and cool evenings.

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 17°C (63°F), with highs reaching up to 30°C (87°F) and lows dropping to around 8°C (47°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 90 mm (3.6 in), occurring over the course of 13 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 90 mm (3.6 inches) of precipitation spread over approximately 13 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 Bethel

In Bethel in September, humidity is 74%. With an average temperature of 17°C (63°F), this humidity feels like a gentle embrace, making outdoor exploration comfortable yet slightly enveloped in warmth, perfect for leisurely strolls but requiring ample hydration for prolonged activities.

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 74%, 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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the 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	6°C (43°F)	179 mm (7.0 inches)	86%	low
February Weather	5°C (42°F)	146 mm (5.7 inches)	84%	moderate
March Weather	7°C (45°F)	119 mm (4.7 inches)	85%	moderate
April Weather	10°C (50°F)	102 mm (4.0 inches)	83%	high
May Weather	13°C (56°F)	67 mm (2.6 inches)	84%	very high
June Weather	16°C (62°F)	64 mm (2.5 inches)	84%	very high
July Weather	19°C (67°F)	26 mm (1.0 inches)	82%	very high
August Weather	20°C (68°F)	24 mm (0.9 inches)	73%	very high
September Weather	17°C (63°F)	90 mm (3.6 inches)	74%	high
October Weather	12°C (54°F)	145 mm (5.7 inches)	83%	moderate
November Weather	9°C (48°F)	181 mm (7.1 inches)	86%	moderate
December Weather	6°C (43°F)	194 mm (7.6 inches)	87%	low