September Weather in Rancho Santa Fe, United States

Last updated: June 24, 2025

In September, the average temperature in Rancho Santa Fe, United States is a pleasant 21°C (71°F). Expect a range where the minimum dips to 15°C (60°F) and the maximum can reach up to 32°C (90°F). With only 5 mm (0.2 in) of precipitation over 0 days, the weather remains fairly dry. On top of that, you'll enjoy a comfortable average humidity of 52%.

September Temperature in Rancho Santa Fe

In September in Rancho Santa Fe, the average temperature is 21°C (71°F), with maximums reaching 32°C (90°F) and minimums dropping to as low as 15°C (60°F). This makes it an ideal time for travelers to enjoy pleasant weather while exploring the sights.

September Weather in Rancho Santa Fe: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rancho Santa Fe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rancho Santa Fe, September typically has an average temperature of 21°C (71°F), with highs reaching up to 32°C (90°F) and lows dropping to around 15°C (60°F).

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

September Precipitation in Rancho Santa Fe

In Rancho Santa Fe in September, the precipitation amount is 5 mm (0.2 in) during a span of 0 days.

September Precipitation Trends in Rancho Santa Fe

The chart displays monthly precipitation patterns in Rancho Santa Fe, 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 Rancho Santa Fe, September typically receives around 5 mm (0.2 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 Rancho Santa Fe

In Rancho Santa Fe in September humidity is 52%. With an average temperature of 21°C (71°F), this humidity feels like a comfortable embrace, making it pleasant for traveling as you can easily enjoy outdoor activities without feeling overheated or sticky.

September Average Humidity in Rancho Santa Fe

This chart illustrates the average monthly humidity levels in Rancho Santa Fe, 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 Rancho Santa Fe 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 Rancho Santa Fe

In Rancho Santa Fe 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 Rancho Santa Fe.

Maximum UV Index Levels in Rancho Santa Fe for September

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

Data source: Rancho Santa Fe 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 Rancho Santa Fe Compares to Other Months

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

This table compares monthly weather conditions in Rancho Santa Fe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (57°F)	67 mm (2.6 inches)	72%	moderate
February Weather	13°C (56°F)	72 mm (2.8 inches)	77%	high
March Weather	14°C (58°F)	64 mm (2.5 inches)	67%	very high
April Weather	16°C (61°F)	30 mm (1.2 inches)	56%	very high
May Weather	17°C (62°F)	23 mm (0.9 inches)	46%	extreme
June Weather	18°C (65°F)	4 mm (0.2 inches)	48%	extreme
July Weather	21°C (70°F)	2 mm (0.1 inches)	46%	extreme
August Weather	22°C (72°F)	2 mm (0.1 inches)	42%	very high
September Weather	21°C (71°F)	5 mm (0.2 inches)	52%	very high
October Weather	20°C (68°F)	13 mm (0.5 inches)	58%	high
November Weather	17°C (62°F)	34 mm (1.3 inches)	66%	moderate
December Weather	14°C (57°F)	73 mm (2.9 inches)	74%	moderate