September Weather in Hallettsville, United States

Last updated: June 24, 2025

In September, the average temperature in Hallettsville, United States is a warm 27°C (81°F). However, be prepared for a range of temperatures, with lows of 12°C (53°F) and highs reaching up to 38°C (101°F). Rain is a possibility, as 110 mm (4.3 in) of precipitation usually falls over approximately 13 days, contributing to an average humidity level of 73%.

September Temperature in Hallettsville

In September, in Hallettsville, the average temperature is 27°C (81°F). Maximums can reach 38°C (101°F), and minimums can drop as low as 12°C (53°F). This makes Hallettsville an ideal destination for travelers seeking warm weather, while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Hallettsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hallettsville, September typically has an average temperature of 27°C (81°F), with highs reaching up to 38°C (101°F) and lows dropping to around 12°C (53°F).

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

September Precipitation in Hallettsville

In Hallettsville in September, the total precipitation amount is 110 mm (4.3 in) over the course of 13 days.

September Precipitation Trends in Hallettsville

The chart displays monthly precipitation patterns in Hallettsville, 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 Hallettsville, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 13 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 Hallettsville

In Hallettsville in September, humidity is 73%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making outdoor activities feel sticky and heavy, while also requiring frequent hydration breaks to stay comfortable during your travels.

September Average Humidity in Hallettsville

This chart illustrates the average monthly humidity levels in Hallettsville, 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 Hallettsville is approximately 73%, 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 Hallettsville

In Hallettsville 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 Hallettsville.

Maximum UV Index Levels in Hallettsville for September

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

Data source: Hallettsville 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 Hallettsville Compares to Other Months

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

This table compares monthly weather conditions in Hallettsville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	60 mm (2.4 inches)	78%	moderate
February Weather	14°C (57°F)	70 mm (2.7 inches)	81%	very high
March Weather	19°C (66°F)	69 mm (2.7 inches)	76%	very high
April Weather	21°C (71°F)	101 mm (4.0 inches)	79%	extreme
May Weather	26°C (78°F)	134 mm (5.3 inches)	79%	extreme
June Weather	28°C (83°F)	105 mm (4.1 inches)	74%	extreme
July Weather	29°C (85°F)	93 mm (3.6 inches)	71%	extreme
August Weather	30°C (86°F)	116 mm (4.6 inches)	68%	extreme
September Weather	27°C (81°F)	110 mm (4.3 inches)	73%	very high
October Weather	22°C (73°F)	75 mm (3.0 inches)	75%	very high
November Weather	17°C (63°F)	66 mm (2.6 inches)	78%	high
December Weather	14°C (58°F)	76 mm (3.0 inches)	84%	moderate