September Weather in Port Lavaca, United States

Last updated: June 24, 2025

In September, the average temperature in Port Lavaca, United States hovers around 27°C (81°F). You'll experience a pleasant range, with minimums dipping to 15°C (58°F) and maximums rising to 35°C (95°F). Be prepared for some rain, as the area sees an average precipitation of 148 mm (5.8 in) over 18 days, and expect a comfortable average humidity of 73%.

September Temperature in Port Lavaca

In September in Port Lavaca, the average temperature is 27°C (81°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop to as low as 15°C (58°F). Travelers should be prepared for a warm climate, ideal for outdoor activities and exploration.

September Weather in Port Lavaca: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Port Lavaca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Lavaca, September typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (95°F) and lows dropping to around 15°C (58°F).

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

September Precipitation in Port Lavaca

In Port Lavaca in September, the total precipitation amount is 148 mm (5.8 in), occurring over the course of 18 days.

September Precipitation Trends in Port Lavaca

The chart displays monthly precipitation patterns in Port Lavaca, 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 Port Lavaca, September typically receives around 148 mm (5.8 inches) of precipitation spread over approximately 18 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 Port Lavaca

In Port Lavaca 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 Port Lavaca

This chart illustrates the average monthly humidity levels in Port Lavaca, 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 Port Lavaca 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 Port Lavaca

In Port Lavaca 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 Port Lavaca.

Maximum UV Index Levels in Port Lavaca for September

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

Data source: Port Lavaca 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 Port Lavaca Compares to Other Months

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

This table compares monthly weather conditions in Port Lavaca, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (57°F)	52 mm (2.0 inches)	78%	moderate
February Weather	15°C (60°F)	52 mm (2.1 inches)	81%	very high
March Weather	20°C (67°F)	57 mm (2.3 inches)	76%	very high
April Weather	22°C (72°F)	59 mm (2.3 inches)	79%	extreme
May Weather	26°C (79°F)	114 mm (4.5 inches)	79%	extreme
June Weather	28°C (83°F)	141 mm (5.6 inches)	74%	extreme
July Weather	29°C (84°F)	104 mm (4.1 inches)	71%	extreme
August Weather	29°C (85°F)	112 mm (4.4 inches)	68%	extreme
September Weather	27°C (81°F)	148 mm (5.8 inches)	73%	extreme
October Weather	23°C (74°F)	81 mm (3.2 inches)	75%	very high
November Weather	18°C (65°F)	61 mm (2.4 inches)	78%	high
December Weather	16°C (60°F)	64 mm (2.5 inches)	84%	moderate