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September Weather in Santa Barbara, Guatemala

Last updated: August 23, 2025

In Santa Barbara, Guatemala, the average temperature in September hovers around 17°C (63°F), with a minimum of 9°C (48°F) and a pleasant maximum of 26°C (80°F). Expect a total precipitation of 259 mm (10.2 in) spread across 28 days, and enjoy the lush atmosphere with an average humidity of 82%.

September Temperature in Santa Barbara

In September in Santa Barbara, the average temperature is 17°C (63°F). Maximums can reach 26°C (80°F) and minimums can be as low as 9°C (48°F). This mild climate makes Santa Barbara an ideal destination for travelers seeking comfortable weather for exploring and enjoying outdoor activities.

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 26°C (80°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec606264656564636363636160
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 259 mm (10.2 in) distributed over 28 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 259 mm (10.2 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec181126682293331232142592496722
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 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

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 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.
JanFebMarAprMayJunJulAugSepOctNovDec121416161515161514141110
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 Weather15°C (60°F)18 mm (0.7 inches)76%extreme
February Weather17°C (62°F)11 mm (0.4 inches)68%extreme
March Weather18°C (64°F)26 mm (1.0 inches)59%extreme
April Weather18°C (65°F)68 mm (2.7 inches)57%extreme
May Weather18°C (65°F)229 mm (9.0 inches)65%extreme
June Weather18°C (64°F)333 mm (13.1 inches)66%extreme
July Weather17°C (64°F)123 mm (4.8 inches)75%extreme
August Weather17°C (64°F)214 mm (8.4 inches)82%extreme
September Weather17°C (63°F)259 mm (10.2 inches)82%extreme
October Weather17°C (63°F)249 mm (9.8 inches)83%extreme
November Weather16°C (62°F)67 mm (2.6 inches)80%extreme
December Weather16°C (60°F)22 mm (0.9 inches)76%very high

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