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September Weather in Glenns Ferry, United States

Last updated: June 24, 2025

In Glenns Ferry, United States, the average temperature in September is a pleasant 19°C (67°F). However, temperatures can swing dramatically, ranging from a chilly 1°C (34°F) to a scorching 39°C (103°F). Expect a modest precipitation amount of 11 mm (0.4 in) over about 2 days, with an average humidity level of 48%. Enjoy the climate, but be prepared for the extremes!

September Temperature in Glenns Ferry

In September in Glenns Ferry, the average temperature is 19°C (67°F). The maximum can reach 39°C (103°F), while the minimum can be as low as 1°C (34°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack both warm and cool clothing options.

September Weather in Glenns Ferry: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Glenns Ferry, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glenns Ferry, September typically has an average temperature of 19°C (67°F), with highs reaching up to 39°C (103°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303444505970817867514131
Data source: Temperature data for Glenns Ferry 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 Glenns Ferry

In Glenns Ferry in September, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

September Precipitation Trends in Glenns Ferry

The chart displays monthly precipitation patterns in Glenns Ferry, 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 Glenns Ferry, September typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec5152392733132511263839
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glenns Ferry

In Glenns Ferry in September, humidity is 48%. With an average temperature of 19°C (67°F), this humidity feels like a comfortable embrace, allowing for pleasant strolls and exploration without feeling sticky or oppressive.

September Average Humidity in Glenns Ferry

This chart illustrates the average monthly humidity levels in Glenns Ferry, 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 Glenns Ferry is approximately 48%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%85%79%71%71%66%50%48%65%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glenns Ferry

In Glenns Ferry 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 Glenns Ferry.

Maximum UV Index Levels in Glenns Ferry for September

The chart shows the monthly maximum UV Index (UVI) for Glenns Ferry 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 Glenns Ferry typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Glenns Ferry 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 Glenns Ferry Compares to Other Months

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

This table compares monthly weather conditions in Glenns Ferry, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)51 mm (2.0 inches)88%moderate
February Weather1°C (34°F)52 mm (2.0 inches)89%moderate
March Weather7°C (44°F)39 mm (1.5 inches)85%high
April Weather10°C (51°F)27 mm (1.1 inches)79%very high
May Weather15°C (59°F)33 mm (1.3 inches)71%very high
June Weather21°C (70°F)13 mm (0.5 inches)71%extreme
July Weather27°C (81°F)2 mm (0.1 inches)66%extreme
August Weather25°C (78°F)5 mm (0.2 inches)50%very high
September Weather19°C (67°F)11 mm (0.4 inches)48%very high
October Weather10°C (51°F)26 mm (1.0 inches)65%high
November Weather5°C (41°F)38 mm (1.5 inches)84%moderate
December Weather0°C (32°F)39 mm (1.6 inches)87%moderate

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