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September Weather in Mount Union, United States

Last updated: June 24, 2025

In Mount Union, United States, the average temperature in September hovers around 19°C (67°F). Expect a range where the minimum dips to 3°C (37°F) and the maximum can soar to 33°C (91°F). You’ll likely experience 127 mm (5.0 in) of precipitation spread over about 10 days, with an average humidity level of 67%.

September Temperature in Mount Union

In September in Mount Union, the average temperature is 19°C (67°F), with maximums reaching up to 33°C (91°F) and minimums dipping as low as 3°C (37°F). This comfortable climate makes it an ideal time for travelers to explore the diverse attractions that Mount Union has to offer.

September Weather in Mount Union: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mount Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Union, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec303340506169757367564135
Data source: Temperature data for Mount Union 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 Mount Union

In Mount Union in September, the precipitation amount is 127 mm (5.0 in), spread over a period of 10 days.

September Precipitation Trends in Mount Union

The chart displays monthly precipitation patterns in Mount Union, 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 Mount Union, September typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6310388103118104107931271107890
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mount Union

In Mount Union in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

September Average Humidity in Mount Union

This chart illustrates the average monthly humidity levels in Mount Union, 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 Mount Union is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mount Union

In Mount Union 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 Mount Union.

Maximum UV Index Levels in Mount Union for September

The chart shows the monthly maximum UV Index (UVI) for Mount Union 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 Mount Union typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Mount Union 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 Mount Union Compares to Other Months

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

This table compares monthly weather conditions in Mount Union, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)63 mm (2.5 inches)89%moderate
February Weather1°C (34°F)103 mm (4.1 inches)90%moderate
March Weather4°C (40°F)88 mm (3.5 inches)89%high
April Weather10°C (51°F)103 mm (4.0 inches)88%very high
May Weather16°C (61°F)118 mm (4.6 inches)80%very high
June Weather21°C (70°F)104 mm (4.1 inches)79%very high
July Weather24°C (76°F)107 mm (4.2 inches)74%very high
August Weather23°C (73°F)93 mm (3.6 inches)64%very high
September Weather19°C (67°F)127 mm (5.0 inches)67%very high
October Weather13°C (56°F)110 mm (4.3 inches)81%high
November Weather5°C (41°F)78 mm (3.1 inches)89%moderate
December Weather2°C (35°F)90 mm (3.5 inches)88%moderate

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