September Weather in Hercules, United States

Last updated: June 24, 2025

In Hercules, United States, the average temperature in September is a pleasant 20°C (68°F). Temperatures can vary widely, with a minimum of 8°C (46°F) and a maximum reaching 43°C (111°F). The region experiences minimal precipitation, averaging just 1 mm (0.0 in) over 0 days. Additionally, enjoy a comfortable average humidity of 55%, making it an ideal time to visit!

September Temperature in Hercules

In September in Hercules, the average temperature is 20°C (68°F). Maximum temperatures can reach 43°C (111°F), while minimums can drop to as low as 8°C (46°F). Be prepared for a wide range of temperatures when traveling during this month.

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

The chart illustrates September temperature patterns in Hercules, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hercules, September typically has an average temperature of 20°C (68°F), with highs reaching up to 43°C (111°F) and lows dropping to around 8°C (46°F).

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

September Precipitation in Hercules

In Hercules in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in Hercules

The chart displays monthly precipitation patterns in Hercules, 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 Hercules, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 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 Hercules

In Hercules in September humidity is 55%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it comfortable for traveling but slightly sticky, encouraging leisurely strolls and relaxed outdoor activities.

September Average Humidity in Hercules

This chart illustrates the average monthly humidity levels in Hercules, 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 Hercules is approximately 55%, 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 Hercules

In Hercules in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hercules.

Maximum UV Index Levels in Hercules for September

The chart shows the monthly maximum UV Index (UVI) for Hercules 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 Hercules typically reaches 9, which falls under the very high exposure category.

Data source: Hercules 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 Hercules Compares to Other Months

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

This table compares monthly weather conditions in Hercules, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	101 mm (4.0 inches)	82%	moderate
February Weather	11°C (53°F)	101 mm (4.0 inches)	84%	moderate
March Weather	12°C (54°F)	77 mm (3.0 inches)	82%	very high
April Weather	15°C (59°F)	32 mm (1.3 inches)	78%	very high
May Weather	17°C (63°F)	18 mm (0.7 inches)	71%	very high
June Weather	19°C (67°F)	1 mm (0.1 inches)	64%	extreme
July Weather	19°C (67°F)	0 mm (0.0 inches)	58%	extreme
August Weather	20°C (68°F)	0 mm (0.0 inches)	54%	very high
September Weather	20°C (68°F)	1 mm (0.0 inches)	55%	very high
October Weather	18°C (64°F)	25 mm (1.0 inches)	62%	high
November Weather	13°C (56°F)	41 mm (1.6 inches)	78%	moderate
December Weather	10°C (50°F)	88 mm (3.5 inches)	80%	moderate