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September Weather in East Missoula, United States

Last updated: June 24, 2025

In September, the average temperature in East Missoula, United States is a pleasant 15°C (58°F). However, be prepared for a temperature range that can drop to a chilly -2°C (28°F) at night and soar up to a warm 35°C (95°F) during the day. Expect approximately 27 mm (1.1 in) of precipitation over 6 days, with an average humidity of 67%, creating a cozy atmosphere for your stay.

September Temperature in East Missoula

In September in East Missoula, the average temperature is 15°C (58°F), with maximums reaching 35°C (95°F) and minimums dropping as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

September Weather in East Missoula: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in East Missoula, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In East Missoula, September typically has an average temperature of 15°C (58°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec262334415261716958433529
Data source: Temperature data for East Missoula 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 East Missoula

In East Missoula in September, the precipitation amount is 27 mm (1.1 in) over a period of 6 days.

September Precipitation Trends in East Missoula

The chart displays monthly precipitation patterns in East Missoula, 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 East Missoula, September typically receives around 27 mm (1.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec398649686564131828605563
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in East Missoula

In East Missoula in September humidity is 67%. With an average temperature of 15°C (58°F), this humidity feels like a mild blanket wrapped around you, making traveling comfortable yet slightly clingy, perfect for exploring cozy cafes and taking leisurely strolls.

September Average Humidity in East Missoula

This chart illustrates the average monthly humidity levels in East Missoula, 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 East Missoula is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%89%85%80%78%77%66%67%77%89%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in East Missoula

In East Missoula 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 East Missoula.

Maximum UV Index Levels in East Missoula for September

The chart shows the monthly maximum UV Index (UVI) for East Missoula 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 East Missoula typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101098532
Data source: East Missoula 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 East Missoula Compares to Other Months

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

This table compares monthly weather conditions in East Missoula, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)39 mm (1.5 inches)93%low
February Weather-5°C (23°F)86 mm (3.4 inches)92%moderate
March Weather1°C (35°F)49 mm (1.9 inches)89%high
April Weather5°C (42°F)68 mm (2.7 inches)85%very high
May Weather11°C (52°F)65 mm (2.6 inches)80%very high
June Weather16°C (61°F)64 mm (2.5 inches)78%very high
July Weather22°C (71°F)13 mm (0.5 inches)77%very high
August Weather20°C (69°F)18 mm (0.7 inches)66%very high
September Weather15°C (58°F)27 mm (1.1 inches)67%very high
October Weather6°C (43°F)60 mm (2.4 inches)77%moderate
November Weather1°C (35°F)55 mm (2.2 inches)89%moderate
December Weather-2°C (29°F)63 mm (2.5 inches)95%low

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