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September Weather in Santa Anna, United States

Last updated: June 24, 2025

In September, the average temperature in Santa Anna, United States hovers around 26°C (79°F). Expect a range from a cool 7°C (45°F) to a sizzling 39°C (102°F). During this time, the area typically receives about 68 mm (2.7 in) of precipitation spread over 6 days, with an average humidity level of 66%.

September Temperature in Santa Anna

In September in Santa Anna, the average temperature is 26°C (79°F). Maximums can reach 39°C (102°F), while minimums can drop as low as 7°C (45°F). It's essential to pack accordingly to enjoy your travels comfortably, as you may encounter both heat and cooler evenings.

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

The chart illustrates September temperature patterns in Santa Anna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Anna, September typically has an average temperature of 26°C (79°F), with highs reaching up to 39°C (102°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec474961667582868579685751
Data source: Temperature data for Santa Anna 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 Anna

In Santa Anna in September, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

September Precipitation Trends in Santa Anna

The chart displays monthly precipitation patterns in Santa Anna, 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 Anna, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec3238716310746254468733239
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Anna

In Santa Anna in September, humidity is 66%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making outdoor activities invigorating yet requiring occasional breaks in the shade to stay comfortable while traveling.

September Average Humidity in Santa Anna

This chart illustrates the average monthly humidity levels in Santa Anna, 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 Anna is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santa Anna

In Santa Anna in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Santa Anna.

Maximum UV Index Levels in Santa Anna for September

The chart shows the monthly maximum UV Index (UVI) for Santa Anna 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 Anna typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111111121110864
Data source: Santa Anna 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 Anna Compares to Other Months

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

This table compares monthly weather conditions in Santa Anna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)32 mm (1.3 inches)78%moderate
February Weather10°C (50°F)38 mm (1.5 inches)78%high
March Weather16°C (61°F)71 mm (2.8 inches)77%very high
April Weather19°C (67°F)63 mm (2.5 inches)78%extreme
May Weather24°C (75°F)107 mm (4.2 inches)82%extreme
June Weather28°C (82°F)46 mm (1.8 inches)78%extreme
July Weather30°C (86°F)25 mm (1.0 inches)69%extreme
August Weather29°C (85°F)44 mm (1.7 inches)63%extreme
September Weather26°C (79°F)68 mm (2.7 inches)66%very high
October Weather20°C (68°F)73 mm (2.9 inches)73%very high
November Weather14°C (57°F)32 mm (1.2 inches)84%high
December Weather11°C (51°F)39 mm (1.5 inches)87%moderate

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