September Weather in Karnes City, United States

Last updated: June 24, 2025

In September, the average temperature in Karnes City, United States reaches a warm 28°C (82°F), with a comfortable average humidity of 65%. Temperatures can vary significantly, dropping to a minimum of 12°C (55°F) and soaring up to a maximum of 39°C (102°F). Expect about 99 mm (3.9 in) of precipitation spread over 12 days, making it wise to pack for both sun and showers!

September Temperature in Karnes City

In September in Karnes City, the average temperature is 28°C (82°F), with maximums reaching up to 39°C (102°F) and minimums dropping as low as 12°C (55°F). Be sure to pack both light clothing for the heat and a sweater for the cooler evenings when traveling during this time.

September Weather in Karnes City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Karnes City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karnes City, September typically has an average temperature of 28°C (82°F), with highs reaching up to 39°C (102°F) and lows dropping to around 12°C (55°F).

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

September Precipitation in Karnes City

In Karnes City in September, the total precipitation amount is 99 mm (3.9 in) recorded over a span of 12 days.

September Precipitation Trends in Karnes City

The chart displays monthly precipitation patterns in Karnes City, 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 Karnes City, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 12 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 Karnes City

In Karnes City in September, humidity is 65%. With an average temperature of 28°C (82°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel a bit more exhausting, so staying hydrated and taking breaks in the shade is essential for a comfortable travel experience.

September Average Humidity in Karnes City

This chart illustrates the average monthly humidity levels in Karnes City, 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 Karnes City 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 Karnes City

In Karnes City 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 Karnes City.

Maximum UV Index Levels in Karnes City for September

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

Data source: Karnes City 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 Karnes City Compares to Other Months

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

This table compares monthly weather conditions in Karnes City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	36 mm (1.4 inches)	79%	moderate
February Weather	14°C (58°F)	49 mm (1.9 inches)	79%	very high
March Weather	19°C (67°F)	49 mm (1.9 inches)	74%	very high
April Weather	22°C (72°F)	58 mm (2.3 inches)	76%	extreme
May Weather	26°C (80°F)	101 mm (4.0 inches)	81%	extreme
June Weather	29°C (84°F)	85 mm (3.3 inches)	76%	extreme
July Weather	30°C (86°F)	80 mm (3.1 inches)	66%	extreme
August Weather	30°C (87°F)	69 mm (2.7 inches)	58%	extreme
September Weather	28°C (82°F)	99 mm (3.9 inches)	65%	extreme
October Weather	23°C (74°F)	64 mm (2.5 inches)	74%	very high
November Weather	17°C (64°F)	52 mm (2.0 inches)	81%	high
December Weather	14°C (58°F)	49 mm (1.9 inches)	86%	moderate