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September Weather in Santa Monica, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santa Monica, Mexico hovers around 25°C (77°F), making it a pleasant time to visit. Expect minimum temperatures to dip to 18°C (64°F) and maximums reaching up to 33°C (93°F). However, be prepared for some rain, as precipitation averages about 270 mm (10.6 in) over 24 days, coupled with a high humidity level of 82%.

September Temperature in Santa Monica

In September in Santa Monica, the average temperature is 25°C (77°F). Maximums can reach 33°C (93°F), and minimums can be as low as 18°C (64°F). This climate makes Santa Monica an ideal destination for outdoor activities and exploration during this time of year.

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

The chart illustrates September temperature patterns in Santa Monica, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Monica, September typically has an average temperature of 25°C (77°F), with highs reaching up to 33°C (93°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec737680838479787876777573
Data source: Temperature data for Santa Monica 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 Monica

In Santa Monica in September, the precipitation amount is 270 mm (10.6 in) spread over a duration of 24 days.

September Precipitation Trends in Santa Monica

The chart displays monthly precipitation patterns in Santa Monica, 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 Monica, September typically receives around 270 mm (10.6 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec223751200157207270108122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Monica

In Santa Monica in September, humidity is 82%. With an average temperature of 25°C (77°F), this humidity feels like a warm, oppressive blanket enveloping you as you explore, making every step feel more laborious and prompting the need for frequent hydration breaks.

September Average Humidity in Santa Monica

This chart illustrates the average monthly humidity levels in Santa Monica, 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 Monica is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santa Monica

In Santa Monica 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 Monica.

Maximum UV Index Levels in Santa Monica for September

The chart shows the monthly maximum UV Index (UVI) for Santa Monica 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 Monica typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131413141413131298
Data source: Santa Monica 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 Monica Compares to Other Months

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

This table compares monthly weather conditions in Santa Monica, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (73°F)1 mm (0.1 inches)84%very high
February Weather25°C (77°F)2 mm (0.1 inches)78%extreme
March Weather27°C (81°F)3 mm (0.1 inches)75%extreme
April Weather28°C (84°F)7 mm (0.3 inches)70%extreme
May Weather29°C (84°F)51 mm (2.0 inches)77%extreme
June Weather26°C (79°F)199 mm (7.9 inches)76%extreme
July Weather26°C (78°F)157 mm (6.2 inches)68%extreme
August Weather25°C (78°F)207 mm (8.1 inches)70%extreme
September Weather25°C (77°F)270 mm (10.6 inches)82%extreme
October Weather25°C (77°F)108 mm (4.2 inches)91%extreme
November Weather24°C (75°F)12 mm (0.5 inches)89%very high
December Weather23°C (73°F)1 mm (0.1 inches)88%very high

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