September Weather in Valley Center, United States

Last updated: June 24, 2025

In Valley Center, United States, the average temperature in September hovers around 22°C (73°F), making it a pleasant time to visit. However, be prepared for temperature fluctuations, as it can dip as low as 9°C (48°F) and soar up to a scorching 41°C (107°F). Expect minimal rainfall, with an average precipitation of just 7 mm (0.3 in) spread over 2 days, and enjoy the moderate average humidity of 52% during your stay.

September Temperature in Valley Center

In September in Valley Center, the average temperature is 22°C (73°F). Maximums can reach 41°C (107°F), and minimums can be as low as 9°C (48°F). This range makes Valley Center an ideal destination for travelers seeking both warm days and cooler evenings.

September Weather in Valley Center: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Valley Center, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valley Center, September typically has an average temperature of 22°C (73°F), with highs reaching up to 41°C (107°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Valley Center

In Valley Center in September, the precipitation amount is 7 mm (0.3 in) over a period of 2 days.

September Precipitation Trends in Valley Center

The chart displays monthly precipitation patterns in Valley Center, 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 Valley Center, September typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 2 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 Valley Center

In Valley Center in September humidity is 52%. With an average temperature of 22°C (73°F), this humidity feels like a comfortable blanket, making it ideal for leisurely explorations and outdoor activities as long as you're hydrated and take breaks in the shade.

September Average Humidity in Valley Center

This chart illustrates the average monthly humidity levels in Valley Center, 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 Valley Center is approximately 52%, 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 Valley Center

In Valley Center 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 Valley Center.

Maximum UV Index Levels in Valley Center for September

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

Data source: Valley Center 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 Valley Center Compares to Other Months

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

This table compares monthly weather conditions in Valley Center, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (53°F)	72 mm (2.8 inches)	72%	moderate
February Weather	11°C (53°F)	87 mm (3.4 inches)	77%	high
March Weather	12°C (55°F)	74 mm (2.9 inches)	67%	very high
April Weather	15°C (60°F)	33 mm (1.3 inches)	56%	very high
May Weather	17°C (62°F)	27 mm (1.0 inches)	46%	extreme
June Weather	20°C (69°F)	3 mm (0.1 inches)	48%	extreme
July Weather	24°C (75°F)	13 mm (0.5 inches)	46%	extreme
August Weather	24°C (76°F)	6 mm (0.3 inches)	42%	very high
September Weather	22°C (73°F)	7 mm (0.3 inches)	52%	very high
October Weather	19°C (66°F)	13 mm (0.5 inches)	58%	high
November Weather	15°C (60°F)	37 mm (1.4 inches)	66%	moderate
December Weather	11°C (53°F)	68 mm (2.7 inches)	74%	moderate