September Weather in South Yuba City, United States

Last updated: June 24, 2025

In South Yuba City, United States, the average temperature in September is a pleasant 25°C (77°F). However, temperatures can vary significantly, with a minimum of 9°C (48°F) and a scorching maximum of 45°C (113°F). During this month, expect minimal rainfall, with an average precipitation of just 2 mm (0.1 in) spread over 0 days. You'll also enjoy relatively dry conditions, as the average humidity hovers around 44%.

September Temperature in South Yuba City

In September in South Yuba City, the average temperature is 25°C (77°F). Maximums can reach 45°C (113°F), while minimums can dip as low as 9°C (48°F). Be prepared for a wide range of temperatures when traveling to South Yuba City this month, ensuring you pack accordingly for both warm days and cooler nights.

September Weather in South Yuba City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Yuba City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Yuba City, September typically has an average temperature of 25°C (77°F), with highs reaching up to 45°C (113°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in South Yuba City

In South Yuba City in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in South Yuba City

The chart displays monthly precipitation patterns in South Yuba City, 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 South Yuba City, September typically receives around 2 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.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in South Yuba City

In South Yuba City 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 South Yuba City

This chart illustrates the average monthly humidity levels in South Yuba City, 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 South Yuba City 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 South Yuba City

In South Yuba City 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 South Yuba City.

Maximum UV Index Levels in South Yuba City for September

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

Data source: South Yuba City 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 South Yuba City Compares to Other Months

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

This table compares monthly weather conditions in South Yuba City, 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 (51°F)	111 mm (4.4 inches)	84%	moderate
February Weather	12°C (54°F)	101 mm (4.0 inches)	84%	moderate
March Weather	14°C (57°F)	86 mm (3.4 inches)	83%	high
April Weather	18°C (65°F)	41 mm (1.6 inches)	81%	very high
May Weather	22°C (72°F)	23 mm (0.9 inches)	74%	very high
June Weather	27°C (81°F)	5 mm (0.2 inches)	64%	extreme
July Weather	28°C (83°F)	0 mm (0.0 inches)	44%	very high
August Weather	27°C (82°F)	0 mm (0.0 inches)	36%	very high
September Weather	25°C (77°F)	2 mm (0.1 inches)	44%	very high
October Weather	20°C (68°F)	32 mm (1.2 inches)	65%	high
November Weather	14°C (57°F)	47 mm (1.9 inches)	84%	moderate
December Weather	10°C (50°F)	84 mm (3.3 inches)	83%	moderate