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September Weather in Mullan, United States

Last updated: June 24, 2025

In September, the average temperature in Mullan, United States is a mild 13°C (56°F), with a potential minimum of -2°C (28°F) and a maximum soaring to 33°C (91°F). Expect about 48 mm (1.9 in) of precipitation spread over 7 days, and enjoy an average humidity level of 62% that adds a touch of freshness to the air.

September Temperature in Mullan

In September, in Mullan, the average temperature is 13°C (56°F). Maximum temperatures can reach 33°C (91°F), while minimums can dip as low as -2°C (28°F). This wide range makes Mullan an ideal destination for travelers seeking diverse weather experiences.

September Weather in Mullan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mullan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mullan, September typically has an average temperature of 13°C (56°F), with highs reaching up to 33°C (91°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec262333405158686756423427
Data source: Temperature data for Mullan 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 Mullan

In Mullan in September, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

September Precipitation Trends in Mullan

The chart displays monthly precipitation patterns in Mullan, 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 Mullan, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec112151991029054122648108138136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mullan

In Mullan in September, humidity is 62%. With an average temperature of 13°C (56°F), this humidity feels like a chill in the air that adds a touch of dampness to your travels, making it essential to dress in layers for comfort while exploring the sights.

September Average Humidity in Mullan

This chart illustrates the average monthly humidity levels in Mullan, 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 Mullan is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mullan

In Mullan 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 Mullan.

Maximum UV Index Levels in Mullan for September

The chart shows the monthly maximum UV Index (UVI) for Mullan 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 Mullan typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2467991097532
Data source: Mullan 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 Mullan Compares to Other Months

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

This table compares monthly weather conditions in Mullan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)112 mm (4.4 inches)89%low
February Weather-5°C (24°F)151 mm (5.9 inches)89%moderate
March Weather0°C (33°F)99 mm (3.9 inches)87%high
April Weather4°C (40°F)102 mm (4.0 inches)84%high
May Weather10°C (51°F)90 mm (3.5 inches)77%very high
June Weather15°C (59°F)54 mm (2.1 inches)78%very high
July Weather20°C (68°F)12 mm (0.5 inches)77%very high
August Weather19°C (67°F)26 mm (1.0 inches)64%very high
September Weather13°C (56°F)48 mm (1.9 inches)62%high
October Weather5°C (42°F)108 mm (4.3 inches)79%moderate
November Weather1°C (34°F)138 mm (5.4 inches)87%moderate
December Weather-3°C (28°F)136 mm (5.4 inches)90%low

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