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September Weather in Arnold, United States

Last updated: June 24, 2025

In September, the average temperature in Arnold, United States hovers around 15°C (59°F). While temperatures can dip to a chilly 1°C (34°F), they can also soar to a pleasant 28°C (83°F). Be prepared for some rain, as the area receives about 108 mm (4.2 in) of precipitation over 12 days. With an average humidity level of 73%, make sure to dress accordingly for a comfortable experience!

September Temperature in Arnold

In September in Arnold, the average temperature is 15°C (59°F), with a maximum that can reach 28°C (83°F) and a minimum that can dip as low as 1°C (34°F). Be prepared for a wide range of temperatures when planning your travel to Arnold this September.

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

The chart illustrates September temperature patterns in Arnold, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arnold, September typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec121227365061676659453020
Data source: Temperature data for Arnold 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 Arnold

In Arnold in September, the total precipitation amount is 108 mm (4.2 in) spread over 12 days.

September Precipitation Trends in Arnold

The chart displays monthly precipitation patterns in Arnold, 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 Arnold, September typically receives around 108 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec2432456583831051061081174961
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Arnold

In Arnold 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 Arnold

This chart illustrates the average monthly humidity levels in Arnold, 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 Arnold 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 Arnold

In Arnold 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 Arnold.

Maximum UV Index Levels in Arnold for September

The chart shows the monthly maximum UV Index (UVI) for Arnold 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 Arnold typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245789987532
Data source: Arnold 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 Arnold Compares to Other Months

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

This table compares monthly weather conditions in Arnold, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)24 mm (1.0 inches)93%low
February Weather-11°C (12°F)32 mm (1.3 inches)93%moderate
March Weather-3°C (27°F)45 mm (1.8 inches)89%moderate
April Weather2°C (36°F)65 mm (2.6 inches)85%high
May Weather10°C (50°F)83 mm (3.3 inches)76%very high
June Weather16°C (61°F)83 mm (3.3 inches)71%very high
July Weather19°C (67°F)105 mm (4.1 inches)70%very high
August Weather19°C (66°F)106 mm (4.2 inches)71%very high
September Weather15°C (59°F)108 mm (4.2 inches)73%high
October Weather7°C (45°F)117 mm (4.6 inches)81%moderate
November Weather-1°C (30°F)49 mm (1.9 inches)87%moderate
December Weather-7°C (20°F)61 mm (2.4 inches)91%low

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