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September Weather in Bethel, United States

Last updated: June 24, 2025

In September, the average temperature in Bethel, United States hovers around 8°C (48°F). However, temperatures can vary significantly, with minimums dropping to a chilly -4°C (25°F) and maximums reaching a pleasant 19°C (67°F). Expect some wet days, as precipitation totals approximately 83 mm (3.3 in) over about 15 days. Don't forget, the average humidity is quite high at 92%, adding a layer of dampness to the air.

September Temperature in Bethel

In September in Bethel, the average temperature is 8°C (48°F). The maximum can reach 19°C (67°F), while the minimum can be as low as -4°C (25°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both mild and chilly conditions.

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 8°C (48°F), with highs reaching up to 19°C (67°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec91519334655575547372115
Data source: Temperature data for Bethel generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Bethel

In Bethel in September, the precipitation amount is 83 mm (3.3 in) spread over 15 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 83 mm (3.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec285648476169648683896358
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bethel

In Bethel in September, humidity is 92%. With an average temperature of 8°C (48°F), this humidity feels like a heavy blanket wrapping around you, making every step feel sluggish and the air thick to breathe, which can turn a simple travel day into an exhausting challenge.

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 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%89%78%80%86%89%91%92%92%95%98%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Bethel for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123456654211
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.
 TemperaturePrecipitationHumidityUV
January Weather-13°C (9°F)28 mm (1.1 inches)97%low
February Weather-10°C (15°F)56 mm (2.2 inches)95%low
March Weather-7°C (19°F)48 mm (1.9 inches)89%moderate
April Weather0°C (33°F)47 mm (1.9 inches)78%moderate
May Weather8°C (46°F)61 mm (2.4 inches)80%moderate
June Weather13°C (55°F)69 mm (2.7 inches)86%high
July Weather14°C (58°F)64 mm (2.5 inches)89%high
August Weather13°C (55°F)86 mm (3.4 inches)91%moderate
September Weather8°C (48°F)83 mm (3.3 inches)92%moderate
October Weather3°C (38°F)89 mm (3.5 inches)92%low
November Weather-6°C (21°F)62 mm (2.5 inches)95%low
December Weather-10°C (15°F)58 mm (2.3 inches)98%low

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