September Weather in Arnold, United States

Last updated: June 24, 2025

In Arnold, United States, the average temperature in September hovers around 18°C (65°F), with a minimum dipping to 2°C (36°F) and a maximum soaring to 35°C (96°F). This month sees a precipitation amount of 12 mm (0.5 in) over approximately 3 days, while the average humidity sits comfortably at 44%.

September Temperature in Arnold

In September in Arnold, the average temperature is 18°C (65°F). The maximum can reach 35°C (96°F) while the minimum can be as low as 2°C (36°F). This makes it an ideal time for travelers to experience a wide range of weather, perfect for exploring both outdoor and indoor attractions.

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 18°C (65°F), with highs reaching up to 35°C (96°F) and lows dropping to around 2°C (36°F).

Data source: Temperature data for Arnold generated using information from the Copernicus Climate Change Service.

September Precipitation in Arnold

In Arnold in September, the precipitation amount is 12 mm (0.5 in) during a span of 3 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 12 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Arnold

In Arnold in September humidity is 44%. With an average temperature of 18°C (65°F), this humidity feels like a pleasant and refreshing experience for traveling, making it comfortable to explore the sights without feeling sticky or overly warm.

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 44%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	258 mm (10.2 inches)	84%	moderate
February Weather	4°C (39°F)	260 mm (10.2 inches)	84%	moderate
March Weather	5°C (41°F)	277 mm (10.9 inches)	83%	very high
April Weather	9°C (48°F)	121 mm (4.8 inches)	81%	very high
May Weather	13°C (55°F)	82 mm (3.2 inches)	74%	extreme
June Weather	19°C (66°F)	16 mm (0.6 inches)	64%	extreme
July Weather	23°C (73°F)	2 mm (0.1 inches)	44%	extreme
August Weather	22°C (72°F)	6 mm (0.2 inches)	36%	extreme
September Weather	18°C (65°F)	12 mm (0.5 inches)	44%	very high
October Weather	13°C (55°F)	59 mm (2.3 inches)	65%	high
November Weather	8°C (46°F)	127 mm (5.0 inches)	84%	moderate
December Weather	4°C (39°F)	197 mm (7.8 inches)	83%	moderate