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September Weather in Santa Ana, Mexico

Last updated: August 26, 2025

In Santa Ana, Mexico, the average temperature in September hovers around 18°C (64°F), with fluctuations ranging from a cool 11°C (51°F) to a warm 28°C (83°F). Expect about 369 mm (14.5 in) of precipitation over 29 days, contributing to a high average humidity of 85%. This combination creates a unique climate that balances warmth and moisture, perfect for those who enjoy lush landscapes and vibrant scenery.

September Temperature in Santa Ana

In September in Santa Ana, the average temperature is 18°C (64°F). Maximums can reach 28°C (83°F), while minimums can drop to as low as 11°C (51°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Santa Ana: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santa Ana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Ana, September typically has an average temperature of 18°C (64°F), with highs reaching up to 28°C (83°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec586064676865646464636057
Data source: Temperature data for Santa Ana 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 Ana

In Santa Ana in September, the precipitation amount is 369 mm (14.5 in) spread over 29 days.

September Precipitation Trends in Santa Ana

The chart displays monthly precipitation patterns in Santa Ana, 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 Ana, September typically receives around 369 mm (14.5 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec151218121143665034903691696511
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Ana

In Santa Ana in September, humidity is 85%. With an average temperature of 18°C (64°F), this humidity feels like a muggy blanket enveloping you, making travel a bit heavy and sticky, as the air clings to your skin and every step can feel like wading through molasses.

September Average Humidity in Santa Ana

This chart illustrates the average monthly humidity levels in Santa Ana, 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 Ana is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%64%54%61%75%83%83%85%85%79%76%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santa Ana

In Santa Ana 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 Ana, you can check here.

Maximum UV Index Levels in Santa Ana for September

The chart shows the monthly maximum UV Index (UVI) for Santa Ana 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 Ana typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10111415141413141412108
Data source: Santa Ana 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 Ana Compares to Other Months

Weather in Santa Ana varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Santa Ana, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Santa Ana, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (58°F)15 mm (0.6 inches)70%very high
February Weather16°C (61°F)12 mm (0.5 inches)64%extreme
March Weather18°C (65°F)18 mm (0.7 inches)54%extreme
April Weather19°C (67°F)12 mm (0.5 inches)61%extreme
May Weather20°C (68°F)114 mm (4.5 inches)75%extreme
June Weather19°C (66°F)366 mm (14.4 inches)83%extreme
July Weather18°C (64°F)503 mm (19.8 inches)83%extreme
August Weather18°C (64°F)490 mm (19.3 inches)85%extreme
September Weather18°C (64°F)369 mm (14.5 inches)85%extreme
October Weather17°C (64°F)169 mm (6.6 inches)79%extreme
November Weather16°C (61°F)65 mm (2.5 inches)76%very high
December Weather14°C (58°F)11 mm (0.4 inches)74%very high

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