September Weather in Sundown, United States

Last updated: June 24, 2025

In Sundown, United States, the average temperature in September hovers around 23°C (73°F), creating a pleasant atmosphere for outdoor activities. However, temperatures can range from a chilly 4°C (40°F) to a scorching 38°C (100°F). Expect about 51 mm (2.0 in) of precipitation over 7 days, contributing to an average humidity level of 71%. Get ready for a month of diverse weather experiences!

September Temperature in Sundown

In September in Sundown, the average temperature is 23°C (73°F). The maximum can reach 38°C (100°F), while the minimum can drop as low as 4°C (40°F). Overall, it's a great time to visit for those who enjoy mild weather with the possibility of warm days and cooler nights.

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

The chart illustrates September temperature patterns in Sundown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sundown, September typically has an average temperature of 23°C (73°F), with highs reaching up to 38°C (100°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Sundown

In Sundown in September, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.

September Precipitation Trends in Sundown

The chart displays monthly precipitation patterns in Sundown, 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 Sundown, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 7 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 Sundown

In Sundown in September humidity is 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

September Average Humidity in Sundown

This chart illustrates the average monthly humidity levels in Sundown, 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 Sundown is approximately 71%, 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 Sundown

In Sundown in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Sundown.

Maximum UV Index Levels in Sundown for September

The chart shows the monthly maximum UV Index (UVI) for Sundown 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 Sundown typically reaches 10, which falls under the very high exposure category.

Data source: Sundown 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 Sundown Compares to Other Months

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

This table compares monthly weather conditions in Sundown, 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 (42°F)	16 mm (0.6 inches)	75%	moderate
February Weather	7°C (45°F)	11 mm (0.4 inches)	74%	high
March Weather	13°C (55°F)	36 mm (1.4 inches)	61%	very high
April Weather	16°C (62°F)	17 mm (0.7 inches)	61%	extreme
May Weather	22°C (72°F)	54 mm (2.1 inches)	67%	extreme
June Weather	26°C (79°F)	48 mm (1.9 inches)	69%	extreme
July Weather	27°C (81°F)	27 mm (1.0 inches)	69%	extreme
August Weather	27°C (80°F)	37 mm (1.5 inches)	66%	extreme
September Weather	23°C (73°F)	51 mm (2.0 inches)	71%	very high
October Weather	16°C (61°F)	55 mm (2.2 inches)	71%	very high
November Weather	10°C (51°F)	16 mm (0.6 inches)	82%	high
December Weather	7°C (45°F)	12 mm (0.5 inches)	80%	moderate