September Weather in Cypress, United States

Last updated: June 24, 2025

In September, the average temperature in Cypress, United States hovers around 27°C (80°F), providing a warm atmosphere for outdoor activities. Temperatures can range from a cool 12°C (55°F) to a sweltering 38°C (100°F), showcasing the variety of weather you might encounter. Expect 146 mm (5.7 in) of precipitation spread over about 14 days, contributing to an average humidity level of 73%. Stay prepared and enjoy your time in this vibrant locale!

September Temperature in Cypress

In September in Cypress, the average temperature is 27°C (80°F). Maximums can reach 38°C (100°F) and minimums can be as low as 12°C (55°F). It's an ideal time for travelers to enjoy both warm afternoons and cooler evenings, making it perfect for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Cypress, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cypress, September typically has an average temperature of 27°C (80°F), with highs reaching up to 38°C (100°F) and lows dropping to around 12°C (55°F).

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

September Precipitation in Cypress

In Cypress in September, the precipitation amount is 146 mm (5.7 in) over a span of 14 days.

September Precipitation Trends in Cypress

The chart displays monthly precipitation patterns in Cypress, 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 Cypress, September typically receives around 146 mm (5.7 inches) of precipitation spread over approximately 14 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 Cypress

In Cypress 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 Cypress

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

In Cypress 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 Cypress.

Maximum UV Index Levels in Cypress for September

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

Data source: Cypress 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 Cypress Compares to Other Months

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

This table compares monthly weather conditions in Cypress, 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)	83 mm (3.2 inches)	78%	moderate
February Weather	14°C (57°F)	99 mm (3.9 inches)	81%	very high
March Weather	18°C (65°F)	75 mm (3.0 inches)	76%	very high
April Weather	21°C (70°F)	87 mm (3.4 inches)	79%	extreme
May Weather	25°C (78°F)	184 mm (7.2 inches)	79%	extreme
June Weather	28°C (82°F)	151 mm (5.9 inches)	74%	extreme
July Weather	29°C (84°F)	116 mm (4.6 inches)	71%	extreme
August Weather	29°C (85°F)	154 mm (6.1 inches)	68%	extreme
September Weather	27°C (80°F)	146 mm (5.7 inches)	73%	very high
October Weather	22°C (72°F)	96 mm (3.8 inches)	75%	very high
November Weather	17°C (62°F)	71 mm (2.8 inches)	78%	high
December Weather	14°C (57°F)	109 mm (4.3 inches)	84%	moderate