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September Weather in Santa Barbara, Guatemala

Last updated: August 23, 2025

In September, the average temperature in Santa Barbara, Guatemala is a pleasant 23°C (74°F). Expect a comfortable range with minimums dipping to 18°C (65°F) and maximums reaching up to 30°C (87°F). However, be prepared for significant rainfall, as the area sees about 484 mm (19.1 in) of precipitation over 30 days, contributing to an average humidity level of 82%.

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 23°C (74°F). Maximum temperatures can reach 30°C (87°F), while the minimum can drop to as low as 18°C (65°F). This makes Santa Barbara a perfect destination for travelers seeking pleasant and mild weather.

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 23°C (74°F), with highs reaching up to 30°C (87°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec737475767575757574747473
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 484 mm (19.1 in) over a period of 30 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 484 mm (19.1 inches) of precipitation spread over approximately 30 days.
JanFebMarAprMayJunJulAugSepOctNovDec31205114748045635541448452319838
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 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

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.
JanFebMarAprMayJunJulAugSepOctNovDec76%68%59%57%65%66%75%82%82%83%80%76%
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.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131312109
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 Weather23°C (73°F)31 mm (1.2 inches)76%extreme
February Weather23°C (75°F)20 mm (0.8 inches)68%extreme
March Weather24°C (76°F)51 mm (2.0 inches)59%extreme
April Weather24°C (76°F)147 mm (5.8 inches)57%extreme
May Weather24°C (76°F)480 mm (18.9 inches)65%extreme
June Weather24°C (75°F)456 mm (18.0 inches)66%extreme
July Weather24°C (75°F)355 mm (14.0 inches)75%extreme
August Weather24°C (75°F)414 mm (16.3 inches)82%extreme
September Weather23°C (74°F)484 mm (19.1 inches)82%extreme
October Weather23°C (74°F)523 mm (20.6 inches)83%extreme
November Weather23°C (74°F)198 mm (7.8 inches)80%very high
December Weather23°C (73°F)38 mm (1.5 inches)76%very high

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