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September Weather in Mellen, United States

Last updated: June 24, 2025

In September, the average temperature in Mellen, United States hovers around 15°C (59°F). However, temperatures can vary significantly, dipping as low as 0°C (32°F) and soaring to a maximum of 31°C (89°F). Expect around 98 mm (3.9 in) of precipitation over approximately 12 days, with an average humidity level of 73%.

September Temperature in Mellen

In September in Mellen, the average temperature is 15°C (59°F), with maximums reaching up to 31°C (89°F) and minimums dropping as low as 0°C (32°F). It's a great time for travelers to experience a mix of warm sunshine and cooler evenings, so be sure to pack accordingly!

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

The chart illustrates September temperature patterns in Mellen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mellen, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (89°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec141428395465696659453021
Data source: Temperature data for Mellen 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 Mellen

In Mellen in September, the precipitation amount is 98 mm (3.9 in) over the course of 12 days.

September Precipitation Trends in Mellen

The chart displays monthly precipitation patterns in Mellen, 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 Mellen, September typically receives around 98 mm (3.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec314652949811595112991005168
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mellen

In Mellen in September humidity is 73%. With an average temperature of 15°C (59°F), this humidity feels like a mild discomfort, making sightseeing a bit sticky and requiring travelers to stay hydrated and take breaks in the shade.

September Average Humidity in Mellen

This chart illustrates the average monthly humidity levels in Mellen, 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 Mellen is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%89%85%76%71%70%71%73%82%88%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mellen

In Mellen 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 Mellen.

Maximum UV Index Levels in Mellen for September

The chart shows the monthly maximum UV Index (UVI) for Mellen 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 Mellen typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810987532
Data source: Mellen 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 Mellen Compares to Other Months

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

This table compares monthly weather conditions in Mellen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)31 mm (1.2 inches)93%low
February Weather-10°C (15°F)46 mm (1.8 inches)93%moderate
March Weather-2°C (28°F)52 mm (2.0 inches)89%moderate
April Weather4°C (39°F)94 mm (3.7 inches)85%high
May Weather12°C (55°F)98 mm (3.9 inches)76%very high
June Weather18°C (66°F)115 mm (4.5 inches)71%very high
July Weather21°C (70°F)95 mm (3.7 inches)70%very high
August Weather19°C (66°F)112 mm (4.4 inches)71%very high
September Weather15°C (59°F)98 mm (3.9 inches)73%high
October Weather7°C (45°F)100 mm (3.9 inches)81%moderate
November Weather-1°C (30°F)51 mm (2.0 inches)87%moderate
December Weather-6°C (21°F)68 mm (2.7 inches)91%low

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