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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 19°C (67°F). While you might enjoy warm days with highs reaching up to 36°C (96°F), be prepared for the occasional dip to a chilly 2°C (35°F). With an average precipitation of 58 mm (2.3 in) spread over 6 days, you may encounter some rain. Don't forget to consider the weather's cozy embrace of 70% humidity during this month!

September Temperature in Arnold

In September in Arnold, the average temperature is 19°C (67°F). The maximum can reach 36°C (96°F) and the minimum can be as low as 2°C (35°F). It's a great time to visit Arnold, so pack for both warm days and cooler nights.

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 19°C (67°F), with highs reaching up to 36°C (96°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec262438465772757266483830
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 precipitation amount is 58 mm (2.3 in) over the course of 6 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 58 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1723694813181827258542733
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 70%. With an average temperature of 19°C (67°F), this humidity feels like a warm blanket wrapping around you, making traveling somewhat uncomfortable and sticky, as the air feels dense and every movement requires a bit more effort.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568101111109643
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-3°C (26°F)17 mm (0.7 inches)73%moderate
February Weather-4°C (25°F)23 mm (0.9 inches)80%moderate
March Weather3°C (39°F)69 mm (2.7 inches)64%high
April Weather8°C (46°F)48 mm (1.9 inches)64%very high
May Weather14°C (58°F)131 mm (5.1 inches)76%very high
June Weather22°C (72°F)81 mm (3.2 inches)79%extreme
July Weather24°C (76°F)82 mm (3.2 inches)77%extreme
August Weather22°C (73°F)72 mm (2.8 inches)79%very high
September Weather19°C (67°F)58 mm (2.3 inches)70%very high
October Weather9°C (48°F)54 mm (2.1 inches)64%high
November Weather4°C (39°F)27 mm (1.1 inches)75%moderate
December Weather-1°C (30°F)33 mm (1.3 inches)78%moderate

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