September Weather in Santa Barbara, Mexico

Last updated: August 27, 2025

In Santa Barbara, Mexico, the average temperature in September is a pleasant 20°C (69°F). Expect a minimum of 11°C (52°F) and soaring highs of up to 33°C (91°F). With 129 mm (5.1 in) of precipitation spread over 17 days, don’t forget your umbrella! The air tends to be quite humid, sitting at an average of 81%.

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 20°C (69°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 11°C (52°F). This varied climate makes it an ideal time for travelers to enjoy outdoor activities while preparing for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Santa Barbara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Barbara, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Santa Barbara

In Santa Barbara in September, the total precipitation amount reaches 129 mm (5.1 in), occurring over a span of 17 days.

September Precipitation Trends in Santa Barbara

The chart displays monthly precipitation patterns in Santa Barbara, 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 Santa Barbara, September typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 17 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 Santa Barbara

In Santa Barbara in September, humidity is 81%. With an average temperature of 20°C (69°F), this humidity feels like a thick blanket embracing you, making travel a bit uncomfortable and sticky.

September Average Humidity in Santa Barbara

This chart illustrates the average monthly humidity levels in Santa Barbara, 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 Santa Barbara is approximately 81%, 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 Santa Barbara

In Santa Barbara in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Santa Barbara.

Maximum UV Index Levels in Santa Barbara for September

The chart shows the monthly maximum UV Index (UVI) for Santa Barbara 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 Santa Barbara typically reaches 13, which falls under the extreme exposure category.

Data source: Santa Barbara 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 Santa Barbara Compares to Other Months

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

This table compares monthly weather conditions in Santa Barbara, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	15°C (60°F)	9 mm (0.3 inches)	74%	very high
February Weather	18°C (64°F)	9 mm (0.3 inches)	65%	extreme
March Weather	21°C (70°F)	4 mm (0.2 inches)	58%	extreme
April Weather	23°C (73°F)	2 mm (0.1 inches)	58%	extreme
May Weather	24°C (76°F)	23 mm (0.9 inches)	67%	extreme
June Weather	23°C (74°F)	137 mm (5.4 inches)	76%	extreme
July Weather	21°C (70°F)	169 mm (6.6 inches)	67%	extreme
August Weather	21°C (70°F)	131 mm (5.1 inches)	68%	extreme
September Weather	20°C (69°F)	129 mm (5.1 inches)	81%	extreme
October Weather	20°C (68°F)	48 mm (1.9 inches)	83%	extreme
November Weather	18°C (64°F)	14 mm (0.6 inches)	84%	very high
December Weather	15°C (60°F)	5 mm (0.2 inches)	81%	very high