September Weather in Walthill, United States

Last updated: June 24, 2025

In September, the average temperature in Walthill, United States hovers around 20°C (68°F), with a minimum of 4°C (40°F) and a maximum reaching up to 35°C (94°F). Expect about 91 mm (3.6 in) of precipitation over 9 days, accompanied by an average humidity of 75%. It's a month that balances warm days with cozy, refreshing moments!

September Temperature in Walthill

In September in Walthill, the average temperature is 20°C (68°F). Maximums can reach 35°C (94°F) and minimums can be as low as 4°C (40°F). This variety in temperatures makes Walthill an ideal destination for traveling, as you can enjoy warm days while being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Walthill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walthill, September typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (94°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Walthill

In Walthill in September, the precipitation amount is 91 mm (3.6 in) spread over 9 days.

September Precipitation Trends in Walthill

The chart displays monthly precipitation patterns in Walthill, 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 Walthill, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Walthill

In Walthill in September, humidity is 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

September Average Humidity in Walthill

This chart illustrates the average monthly humidity levels in Walthill, 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 Walthill is approximately 75%, 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 Walthill

In Walthill 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 Walthill.

Maximum UV Index Levels in Walthill for September

The chart shows the monthly maximum UV Index (UVI) for Walthill 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 Walthill typically reaches 8, which falls under the very high exposure category.

Data source: Walthill 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 Walthill Compares to Other Months

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

This table compares monthly weather conditions in Walthill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	29 mm (1.1 inches)	80%	moderate
February Weather	-5°C (23°F)	30 mm (1.2 inches)	84%	moderate
March Weather	4°C (39°F)	84 mm (3.3 inches)	75%	moderate
April Weather	9°C (48°F)	74 mm (2.9 inches)	79%	very high
May Weather	16°C (61°F)	143 mm (5.6 inches)	74%	very high
June Weather	24°C (75°F)	111 mm (4.4 inches)	81%	extreme
July Weather	25°C (77°F)	64 mm (2.5 inches)	82%	very high
August Weather	23°C (73°F)	113 mm (4.5 inches)	80%	very high
September Weather	20°C (68°F)	91 mm (3.6 inches)	75%	very high
October Weather	10°C (51°F)	78 mm (3.1 inches)	77%	moderate
November Weather	3°C (38°F)	27 mm (1.0 inches)	85%	moderate
December Weather	-2°C (29°F)	43 mm (1.7 inches)	83%	low