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September Weather in Mountain Home, United States

Last updated: June 24, 2025

In Mountain Home, United States, the average temperature in September hovers around 18°C (66°F). Expect a range where minimums can dip to 3°C (37°F) while maximums can soar up to 38°C (100°F). With an average humidity of 48%, the climate remains comfortable. Rainfall is modest, with 12 mm (0.5 in) expected over just 2 days.

September Temperature in Mountain Home

In September in Mountain Home, the average temperature is 18°C (66°F). Maximums can reach 38°C (100°F), while minimums can drop to as low as 3°C (37°F). Be prepared for a wide range of temperatures, making it essential to pack accordingly for your trip.

September Weather in Mountain Home: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mountain Home, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mountain Home, September typically has an average temperature of 18°C (66°F), with highs reaching up to 38°C (100°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec313343495868797665504031
Data source: Temperature data for Mountain Home 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 Mountain Home

In Mountain Home in September, the precipitation amount is 12 mm (0.5 in) over the course of 2 days.

September Precipitation Trends in Mountain Home

The chart displays monthly precipitation patterns in Mountain Home, 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 Mountain Home, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec56594339412231013274145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mountain Home

In Mountain Home in September humidity is 48%. With an average temperature of 18°C (66°F), this humidity feels like a comfortable embrace, making it ideal for leisurely walks and outdoor explorations, allowing travelers to enjoy the scenery without feeling weighed down by heat or stickiness.

September Average Humidity in Mountain Home

This chart illustrates the average monthly humidity levels in Mountain Home, 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 Mountain Home 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 Mountain Home

In Mountain Home 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 Mountain Home.

Maximum UV Index Levels in Mountain Home for September

The chart shows the monthly maximum UV Index (UVI) for Mountain Home 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 Mountain Home typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111108642
Data source: Mountain Home 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 Mountain Home Compares to Other Months

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

This table compares monthly weather conditions in Mountain Home, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)56 mm (2.2 inches)88%moderate
February Weather1°C (34°F)59 mm (2.3 inches)89%moderate
March Weather6°C (43°F)43 mm (1.7 inches)85%high
April Weather9°C (49°F)38 mm (1.5 inches)79%very high
May Weather14°C (58°F)41 mm (1.6 inches)71%very high
June Weather20°C (68°F)22 mm (0.9 inches)71%extreme
July Weather26°C (79°F)3 mm (0.1 inches)66%extreme
August Weather24°C (76°F)10 mm (0.4 inches)50%very high
September Weather18°C (66°F)12 mm (0.5 inches)48%very high
October Weather10°C (50°F)27 mm (1.1 inches)65%high
November Weather4°C (40°F)41 mm (1.6 inches)84%moderate
December Weather-1°C (31°F)45 mm (1.8 inches)87%low

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