September Weather in Kerrville, United States

Last updated: June 24, 2025

In September, the average temperature in Kerrville, United States hovers around 25°C (77°F). Expect a range of 9°C (48°F) as the minimum and a scorching 37°C (99°F) as the maximum. Prepare for some rain, with an average precipitation of 110 mm (4.3 in) spread over 9 days. The atmosphere carries a comfortable humidity level of 65%, making it an inviting time to visit!

September Temperature in Kerrville

In September in Kerrville, the average temperature is 25°C (77°F). The maximum can reach 37°C (99°F), while the minimum can drop as low as 9°C (48°F). Travelers should be prepared for warm weather along with cooler evenings, making it a great time to enjoy outdoor activities and explore the local attractions.

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

The chart illustrates September temperature patterns in Kerrville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kerrville, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Kerrville

In Kerrville in September, the precipitation amount is 110 mm (4.3 in) over the course of 9 days.

September Precipitation Trends in Kerrville

The chart displays monthly precipitation patterns in Kerrville, 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 Kerrville, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 9 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 Kerrville

In Kerrville in September, humidity is 65%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor activities slightly uncomfortable but still bearable, as the sticky air clings to your skin and encourages you to seek shade or a refreshing drink.

September Average Humidity in Kerrville

This chart illustrates the average monthly humidity levels in Kerrville, 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 Kerrville is approximately 65%, 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 Kerrville

In Kerrville in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Kerrville.

Maximum UV Index Levels in Kerrville for September

The chart shows the monthly maximum UV Index (UVI) for Kerrville 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 Kerrville typically reaches 11, which falls under the extreme exposure category.

Data source: Kerrville 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 Kerrville Compares to Other Months

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

This table compares monthly weather conditions in Kerrville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	42 mm (1.6 inches)	79%	moderate
February Weather	11°C (52°F)	50 mm (2.0 inches)	79%	very high
March Weather	16°C (61°F)	63 mm (2.5 inches)	74%	very high
April Weather	19°C (67°F)	81 mm (3.2 inches)	76%	extreme
May Weather	23°C (74°F)	142 mm (5.6 inches)	81%	extreme
June Weather	26°C (79°F)	60 mm (2.3 inches)	76%	extreme
July Weather	28°C (82°F)	47 mm (1.8 inches)	66%	extreme
August Weather	28°C (82°F)	54 mm (2.1 inches)	58%	extreme
September Weather	25°C (77°F)	110 mm (4.3 inches)	65%	extreme
October Weather	20°C (68°F)	80 mm (3.1 inches)	74%	very high
November Weather	14°C (58°F)	28 mm (1.1 inches)	81%	high
December Weather	11°C (53°F)	35 mm (1.4 inches)	86%	moderate