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September Weather in Santa Rosa, Mexico

Last updated: August 27, 2025

In Santa Rosa, Mexico, the average temperature in September is a mild 14°C (58°F). Expect a chill with minimums around 5°C (41°F) and a cozy maximum of 23°C (74°F). Be prepared for some rain, as the area receives an average of 236 mm (9.3 in) of precipitation over approximately 25 days. With an average humidity level of 82%, the air feels quite refreshing, adding to the unique charm of the season.

September Temperature in Santa Rosa

In September in Santa Rosa, the average temperature is 14°C (58°F). The maximum can reach 23°C (74°F), while the minimum can drop as low as 5°C (41°F). It's a great time to explore Santa Rosa, offering pleasant weather for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Santa Rosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santa Rosa, September typically has an average temperature of 14°C (58°F), with highs reaching up to 23°C (74°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec505357596160585858565351
Data source: Temperature data for Santa Rosa 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 Rosa

In Santa Rosa in September, the total precipitation amount is 236 mm (9.3 in) over the course of 25 days.

September Precipitation Trends in Santa Rosa

The chart displays monthly precipitation patterns in Santa Rosa, 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 Rosa, September typically receives around 236 mm (9.3 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec22274668902002672652361004014
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Rosa

In Santa Rosa in September, humidity is 82%. With an average temperature of 14°C (58°F), this humidity feels like a heavy blanket wrapping around you, making travel uncomfortable and sticky.

September Average Humidity in Santa Rosa

This chart illustrates the average monthly humidity levels in Santa Rosa, 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 Rosa 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 Rosa

In Santa Rosa 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 Rosa, you can check here.

Maximum UV Index Levels in Santa Rosa for September

The chart shows the monthly maximum UV Index (UVI) for Santa Rosa 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 Rosa typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121415141414141412108
Data source: Santa Rosa 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 Rosa Compares to Other Months

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

This table compares monthly weather conditions in Santa Rosa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)22 mm (0.9 inches)84%very high
February Weather12°C (54°F)27 mm (1.1 inches)78%extreme
March Weather14°C (57°F)46 mm (1.8 inches)75%extreme
April Weather15°C (59°F)68 mm (2.7 inches)70%extreme
May Weather16°C (61°F)90 mm (3.6 inches)77%extreme
June Weather16°C (60°F)200 mm (7.9 inches)76%extreme
July Weather14°C (58°F)267 mm (10.5 inches)68%extreme
August Weather14°C (58°F)265 mm (10.4 inches)70%extreme
September Weather14°C (58°F)236 mm (9.3 inches)82%extreme
October Weather14°C (57°F)100 mm (4.0 inches)91%extreme
November Weather12°C (53°F)40 mm (1.6 inches)89%very high
December Weather10°C (51°F)14 mm (0.6 inches)88%very high

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