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September Weather in Santa Barbara, Mexico

Last updated: August 27, 2025

The average temperature in Santa Barbara, Mexico during September is a pleasant 22°C (72°F). Expect minimum temperatures to drop to 11°C (53°F), while warm days can peak at 34°C (93°F). With an average precipitation amount of 104 mm (4.1 in) spread over 14 days, it's wise to keep an umbrella handy. The average humidity sits at a high 82%, ensuring a tropical feel throughout the month.

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 22°C (72°F), with maximums that can reach 34°C (93°F) and minimums that can drop as low as 11°C (53°F). This makes it an ideal time for travelers to enjoy a comfortable climate while exploring the vibrant culture and stunning landscapes of 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 22°C (72°F), with highs reaching up to 34°C (93°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec556066727779767671686356
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 104 mm (4.1 in) distributed over a span of 14 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 104 mm (4.1 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec5783731806210444713
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 82%. With an average temperature of 22°C (72°F), this humidity feels like walking through a warm, damp blanket, making travel feel more exhausting and sticky as sweat clings to your skin, and every step seems to draw you into a slow, sultry embrace.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%62%53%48%52%64%73%71%82%83%82%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec710121414131313131197
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 Weather13°C (56°F)5 mm (0.2 inches)70%high
February Weather16°C (61°F)7 mm (0.3 inches)62%very high
March Weather19°C (67°F)8 mm (0.3 inches)53%extreme
April Weather22°C (72°F)3 mm (0.1 inches)48%extreme
May Weather25°C (78°F)7 mm (0.3 inches)52%extreme
June Weather26°C (80°F)31 mm (1.2 inches)64%extreme
July Weather24°C (76°F)80 mm (3.2 inches)73%extreme
August Weather24°C (76°F)62 mm (2.4 inches)71%extreme
September Weather22°C (72°F)104 mm (4.1 inches)82%extreme
October Weather20°C (69°F)44 mm (1.7 inches)83%extreme
November Weather17°C (63°F)7 mm (0.3 inches)82%very high
December Weather13°C (56°F)13 mm (0.5 inches)84%high

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