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September Weather in Santa Barbara, Mexico

Last updated: August 27, 2025

In Santa Barbara, Mexico, the average temperature in September hovers around 20°C (67°F). Expect a range that can dip to a brisk 10°C (50°F) and soar up to a warm 32°C (89°F). Precipitation tends to be moderate, with around 126 mm (5.0 in) falling over 15 days. Coupled with an average humidity of 86%, this month brings a mix of cozy warmth and refreshing rain.

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 20°C (67°F), with maximums reaching up to 32°C (89°F) and minimums dropping as low as 10°C (50°F). This variety makes it an ideal time for travelers to enjoy outdoor activities while also being prepared for cooler evenings.

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 (67°F), with highs reaching up to 32°C (89°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec505460667276727267645750
Data source: Temperature data for Santa Barbara generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Santa Barbara

In Santa Barbara in September, the precipitation amount is 126 mm (5.0 in) spread over 15 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 126 mm (5.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec677683911092126422020
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Barbara

In Santa Barbara in September, humidity is 86%. With an average temperature of 20°C (67°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy; it's advisable to stay hydrated and take frequent breaks in the shade.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%65%58%48%48%54%72%77%86%82%85%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec710121414131313131187
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.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)6 mm (0.2 inches)75%high
February Weather12°C (54°F)7 mm (0.3 inches)65%very high
March Weather16°C (60°F)7 mm (0.3 inches)58%extreme
April Weather19°C (67°F)5 mm (0.2 inches)48%extreme
May Weather22°C (73°F)8 mm (0.3 inches)48%extreme
June Weather25°C (76°F)39 mm (1.6 inches)54%extreme
July Weather22°C (72°F)109 mm (4.3 inches)72%extreme
August Weather22°C (72°F)92 mm (3.6 inches)77%extreme
September Weather20°C (67°F)126 mm (5.0 inches)86%extreme
October Weather18°C (64°F)42 mm (1.7 inches)82%extreme
November Weather14°C (57°F)20 mm (0.8 inches)85%very high
December Weather10°C (50°F)20 mm (0.8 inches)87%high

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