September Weather in Callahan, United States

Last updated: June 24, 2025

In September, the average temperature in Callahan, United States is a warm 26°C (80°F). Expect a brisk minimum of 17°C (62°F) and a sizzling maximum of 36°C (97°F). Humidity hovers around a muggy 83%, with 157 mm (6.2 in) of precipitation expected over 16 days. Make sure to pack accordingly!

September Temperature in Callahan

In September in Callahan, the average temperature is 26°C (80°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 17°C (62°F). It's a great time for travelers to enjoy warm weather while having the option for cooler evenings.

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

The chart illustrates September temperature patterns in Callahan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Callahan, September typically has an average temperature of 26°C (80°F), with highs reaching up to 36°C (97°F) and lows dropping to around 17°C (62°F).

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

September Precipitation in Callahan

In Callahan in September, the total precipitation amount is 157 mm (6.2 in) spread over 16 days.

September Precipitation Trends in Callahan

The chart displays monthly precipitation patterns in Callahan, 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 Callahan, September typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 16 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 Callahan

In Callahan in September humidity is 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings to your skin.

September Average Humidity in Callahan

This chart illustrates the average monthly humidity levels in Callahan, 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 Callahan is approximately 83%, 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 Callahan

In Callahan 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 Callahan.

Maximum UV Index Levels in Callahan for September

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

Data source: Callahan 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 Callahan Compares to Other Months

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

This table compares monthly weather conditions in Callahan, 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 (56°F)	45 mm (1.8 inches)	84%	moderate
February Weather	16°C (61°F)	69 mm (2.7 inches)	79%	high
March Weather	18°C (64°F)	41 mm (1.6 inches)	78%	very high
April Weather	21°C (70°F)	66 mm (2.6 inches)	72%	extreme
May Weather	24°C (76°F)	86 mm (3.4 inches)	72%	extreme
June Weather	26°C (80°F)	170 mm (6.7 inches)	74%	extreme
July Weather	27°C (81°F)	196 mm (7.7 inches)	82%	extreme
August Weather	27°C (81°F)	190 mm (7.5 inches)	82%	extreme
September Weather	26°C (80°F)	157 mm (6.2 inches)	83%	very high
October Weather	23°C (74°F)	74 mm (2.9 inches)	79%	very high
November Weather	17°C (63°F)	64 mm (2.5 inches)	82%	high
December Weather	14°C (58°F)	85 mm (3.3 inches)	85%	moderate