September Weather in Friendswood, United States

Last updated: June 24, 2025

In Friendswood, United States, the average temperature in September hovers around 27°C (80°F). However, it can swing from a cool 14°C (57°F) to a warm 36°C (96°F). Expect some rain during your stay, with a total precipitation of 204 mm (8.1 in) over 17 days. Be ready for a touch of humidity, as the average levels reach 73%. Enjoy your adventure!

September Temperature in Friendswood

In September in Friendswood, the average temperature is 27°C (80°F). Maximums can reach 36°C (96°F), while minimums can dip as low as 14°C (57°F). This pleasant range makes it an ideal time for outdoor adventures and sightseeing.

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

The chart illustrates September temperature patterns in Friendswood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Friendswood, September typically has an average temperature of 27°C (80°F), with highs reaching up to 36°C (96°F) and lows dropping to around 14°C (57°F).

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

September Precipitation in Friendswood

In Friendswood, in September, the precipitation amount is 204 mm (8.1 in) over a span of 17 days.

September Precipitation Trends in Friendswood

The chart displays monthly precipitation patterns in Friendswood, 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 Friendswood, September typically receives around 204 mm (8.1 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 Friendswood

In Friendswood in September humidity is 73%. With an average temperature of 27°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling feel sticky and slightly uncomfortable, prompting frequent breaks in the shade and plenty of hydration.

September Average Humidity in Friendswood

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

In Friendswood 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 Friendswood.

Maximum UV Index Levels in Friendswood for September

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

Data source: Friendswood 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 Friendswood Compares to Other Months

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

This table compares monthly weather conditions in Friendswood, 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)	84 mm (3.3 inches)	78%	moderate
February Weather	15°C (59°F)	85 mm (3.3 inches)	81%	very high
March Weather	19°C (66°F)	72 mm (2.8 inches)	76%	very high
April Weather	21°C (70°F)	91 mm (3.6 inches)	79%	extreme
May Weather	25°C (77°F)	171 mm (6.7 inches)	79%	extreme
June Weather	28°C (82°F)	168 mm (6.6 inches)	74%	extreme
July Weather	28°C (84°F)	153 mm (6.0 inches)	71%	extreme
August Weather	29°C (84°F)	199 mm (7.9 inches)	68%	extreme
September Weather	27°C (80°F)	204 mm (8.1 inches)	73%	very high
October Weather	23°C (73°F)	105 mm (4.1 inches)	75%	very high
November Weather	17°C (63°F)	79 mm (3.1 inches)	78%	high
December Weather	15°C (59°F)	104 mm (4.1 inches)	84%	moderate