September Weather in Gridley, United States

Last updated: June 24, 2025

In September, the average temperature in Gridley, United States is a pleasant 25°C (77°F). However, visitors should be prepared for a range of temperatures, with minimums dipping to 7°C (46°F) and soaring maximums reaching up to 44°C (112°F). Rainfall is minimal, with an average precipitation of just 3 mm (0.1 in) over 1 day. Despite the heat, the average humidity remains comfortable at 44%.

September Temperature in Gridley

In September in Gridley, the average temperature is 25°C (77°F). Maximum highs can reach 44°C (112°F), while minimum lows can drop to as low as 7°C (46°F). It's advisable for travelers to prepare for a wide range of temperatures and adjust their wardrobe accordingly.

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

The chart illustrates September temperature patterns in Gridley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gridley, September typically has an average temperature of 25°C (77°F), with highs reaching up to 44°C (112°F) and lows dropping to around 7°C (46°F).

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

September Precipitation in Gridley

In Gridley in September, the precipitation amount is 3 mm (0.1 in) over the course of 1 day.

September Precipitation Trends in Gridley

The chart displays monthly precipitation patterns in Gridley, 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 Gridley, September typically receives around 3 mm (0.1 inches) of precipitation spread over approximately 1 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 Gridley

In Gridley in September, humidity is 44%. With an average temperature of 25°C (77°F), this humidity feels like a comfortable, warm embrace, making it pleasant for traveling as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Gridley

This chart illustrates the average monthly humidity levels in Gridley, 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 Gridley is approximately 44%, 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 Gridley

In Gridley 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 Gridley.

Maximum UV Index Levels in Gridley for September

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

Data source: Gridley 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 Gridley Compares to Other Months

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

This table compares monthly weather conditions in Gridley, 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)	124 mm (4.9 inches)	84%	moderate
February Weather	12°C (53°F)	121 mm (4.8 inches)	84%	moderate
March Weather	14°C (57°F)	107 mm (4.2 inches)	83%	high
April Weather	18°C (64°F)	50 mm (2.0 inches)	81%	very high
May Weather	22°C (72°F)	29 mm (1.2 inches)	74%	very high
June Weather	27°C (81°F)	5 mm (0.2 inches)	64%	extreme
July Weather	29°C (85°F)	1 mm (0.0 inches)	44%	very high
August Weather	28°C (83°F)	0 mm (0.0 inches)	36%	very high
September Weather	25°C (77°F)	3 mm (0.1 inches)	44%	very high
October Weather	19°C (67°F)	35 mm (1.4 inches)	65%	high
November Weather	13°C (56°F)	58 mm (2.3 inches)	84%	moderate
December Weather	10°C (50°F)	99 mm (3.9 inches)	83%	moderate