September Weather in Grover Beach, United States

Last updated: June 24, 2025

In September, the average temperature in Grover Beach, United States is a pleasant 18°C (64°F). You can expect a range from a refreshing minimum of 11°C (52°F) to a warm maximum of 32°C (90°F). With only 1 mm (0.1 in) of precipitation over 0 days, it's a great time to enjoy outdoor activities. The air will feel comfortably humid, with an average humidity level of 70%.

September Temperature in Grover Beach

In September in Grover Beach, the average temperature is 18°C (64°F), with maximums reaching 32°C (90°F) and minimums dropping to as low as 11°C (52°F). This pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Grover Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grover Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grover Beach, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Grover Beach

In Grover Beach in September, the precipitation amount is 1 mm (0.1 in) during 0 days, indicating a very dry period.

September Precipitation Trends in Grover Beach

The chart displays monthly precipitation patterns in Grover Beach, 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 Grover Beach, September typically receives around 1 mm (0.1 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 Grover Beach

In Grover Beach in September humidity is 70%. With an average temperature of 18°C (64°F), this humidity feels like a sticky embrace, making outdoor excursions a bit more cumbersome and requiring frequent breaks to stay refreshed and hydrated.

September Average Humidity in Grover Beach

This chart illustrates the average monthly humidity levels in Grover Beach, 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 Grover Beach is approximately 70%, 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 Grover Beach

In Grover Beach 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 Grover Beach.

Maximum UV Index Levels in Grover Beach for September

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

Data source: Grover Beach 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 Grover Beach Compares to Other Months

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

This table compares monthly weather conditions in Grover Beach, 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)	100 mm (3.9 inches)	80%	moderate
February Weather	12°C (53°F)	81 mm (3.2 inches)	83%	high
March Weather	12°C (54°F)	88 mm (3.5 inches)	80%	very high
April Weather	13°C (57°F)	24 mm (1.0 inches)	76%	very high
May Weather	14°C (58°F)	12 mm (0.5 inches)	75%	extreme
June Weather	16°C (61°F)	2 mm (0.1 inches)	74%	extreme
July Weather	18°C (64°F)	1 mm (0.0 inches)	75%	extreme
August Weather	18°C (65°F)	1 mm (0.0 inches)	72%	extreme
September Weather	18°C (64°F)	1 mm (0.1 inches)	70%	very high
October Weather	17°C (63°F)	10 mm (0.4 inches)	70%	high
November Weather	14°C (58°F)	33 mm (1.3 inches)	74%	moderate
December Weather	12°C (54°F)	72 mm (2.8 inches)	76%	moderate