September Weather in Sweeny, United States

Last updated: June 24, 2025

In September, the average temperature in Sweeny, United States is a warm 27°C (81°F). Expect a range from a cool 14°C (57°F) at night to a toasty 36°C (97°F) during the day. With a precipitation of 174 mm (6.9 in) over 17 days, you might want to carry an umbrella or light jacket. The average humidity hovers around 73%, adding to the tropical feel of the month.

September Temperature in Sweeny

In September in Sweeny, the average temperature is 27°C (81°F), with maximums that can reach 36°C (97°F) and minimums that can drop to as low as 14°C (57°F). It's a great time for travelers to enjoy warm weather while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Sweeny, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sweeny, September typically has an average temperature of 27°C (81°F), with highs reaching up to 36°C (97°F) and lows dropping to around 14°C (57°F).

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

September Precipitation in Sweeny

In Sweeny in September, the total precipitation amount is 174 mm (6.9 in) spread over 17 days.

September Precipitation Trends in Sweeny

The chart displays monthly precipitation patterns in Sweeny, 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 Sweeny, September typically receives around 174 mm (6.9 inches) of precipitation spread over approximately 17 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 Sweeny

In Sweeny 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 Sweeny

This chart illustrates the average monthly humidity levels in Sweeny, 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 Sweeny 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 Sweeny

In Sweeny 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 Sweeny.

Maximum UV Index Levels in Sweeny for September

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

Data source: Sweeny 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 Sweeny Compares to Other Months

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

This table compares monthly weather conditions in Sweeny, 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 (57°F)	75 mm (2.9 inches)	78%	moderate
February Weather	15°C (60°F)	68 mm (2.7 inches)	81%	very high
March Weather	19°C (67°F)	70 mm (2.8 inches)	76%	very high
April Weather	22°C (72°F)	71 mm (2.8 inches)	79%	extreme
May Weather	26°C (79°F)	147 mm (5.8 inches)	79%	extreme
June Weather	28°C (83°F)	159 mm (6.3 inches)	74%	extreme
July Weather	29°C (84°F)	151 mm (6.0 inches)	71%	extreme
August Weather	29°C (85°F)	169 mm (6.6 inches)	68%	extreme
September Weather	27°C (81°F)	174 mm (6.9 inches)	73%	extreme
October Weather	23°C (74°F)	81 mm (3.2 inches)	75%	very high
November Weather	18°C (64°F)	78 mm (3.1 inches)	78%	high
December Weather	15°C (60°F)	88 mm (3.5 inches)	84%	moderate