September Weather in Santa Barbara, Mexico

Last updated: August 27, 2025

In Santa Barbara, Mexico, the average temperature in September hovers around 17°C (63°F), with minimums dropping to 8°C (46°F) and maximums soaring to 27°C (80°F). Expect 185 mm (7.3 in) of precipitation spread over 17 days, contributing to an average humidity of 81%. Stay prepared for a mix of mild temperatures and frequent rain!

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 17°C (63°F), with a maximum that can reach 27°C (80°F) and a minimum that can be as low as 8°C (46°F). This moderate climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Santa Barbara.

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 17°C (63°F), with highs reaching up to 27°C (80°F) and lows dropping to around 8°C (46°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 precipitation amount is 185 mm (7.3 in), which occurs 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 185 mm (7.3 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 17°C (63°F), this humidity feels like a warm blanket enveloping you, making travel slightly oppressive and calling for frequent breaks in air-conditioned spaces to recharge and enjoy your journey comfortably.

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 is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Santa Barbara, you can check here.

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 14, 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	12°C (54°F)	10 mm (0.4 inches)	74%	very high
February Weather	14°C (58°F)	13 mm (0.5 inches)	65%	extreme
March Weather	17°C (62°F)	16 mm (0.6 inches)	58%	extreme
April Weather	18°C (65°F)	9 mm (0.4 inches)	58%	extreme
May Weather	20°C (68°F)	52 mm (2.0 inches)	67%	extreme
June Weather	19°C (66°F)	180 mm (7.1 inches)	76%	extreme
July Weather	17°C (64°F)	172 mm (6.8 inches)	67%	extreme
August Weather	18°C (64°F)	133 mm (5.2 inches)	68%	extreme
September Weather	17°C (63°F)	185 mm (7.3 inches)	81%	extreme
October Weather	16°C (61°F)	75 mm (3.0 inches)	83%	extreme
November Weather	14°C (57°F)	22 mm (0.9 inches)	84%	very high
December Weather	12°C (54°F)	8 mm (0.3 inches)	81%	very high