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September Weather in Santa Rosa, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santa Rosa, Mexico hovers around 17°C (63°F). Expect minimums of 8°C (46°F) and maximums reaching 26°C (79°F). With an average precipitation of 141 mm (5.6 in) spread over 19 days, and a high humidity level of 86%, pack accordingly for a blend of warmth and moisture as you explore!

September Temperature in Santa Rosa

In September in Santa Rosa, the average temperature is 17°C (63°F). Maximums can reach 26°C (79°F), and minimums can be as low as 8°C (46°F). This mild climate makes Santa Rosa an ideal destination for travelers seeking comfortable weather for outdoor activities.

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 17°C (63°F), with highs reaching up to 26°C (79°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec525661656869656563615752
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 precipitation amount reaches 141 mm (5.6 in) over a span of 19 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 141 mm (5.6 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec1711651994182100141551712
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 86%. With an average temperature of 17°C (63°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and slightly stifling for traveling, as every step requires more effort and even a gentle breeze feels refreshing amidst the muggy atmosphere.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%64%49%47%55%77%82%83%86%83%80%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec8111315151414141412108
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 Weather11°C (52°F)17 mm (0.7 inches)71%very high
February Weather13°C (56°F)11 mm (0.4 inches)64%extreme
March Weather16°C (62°F)6 mm (0.2 inches)49%extreme
April Weather18°C (65°F)5 mm (0.2 inches)47%extreme
May Weather20°C (69°F)19 mm (0.8 inches)55%extreme
June Weather20°C (69°F)94 mm (3.7 inches)77%extreme
July Weather18°C (65°F)182 mm (7.2 inches)82%extreme
August Weather19°C (66°F)100 mm (3.9 inches)83%extreme
September Weather17°C (63°F)141 mm (5.6 inches)86%extreme
October Weather16°C (61°F)55 mm (2.1 inches)83%extreme
November Weather14°C (57°F)17 mm (0.7 inches)80%very high
December Weather11°C (52°F)12 mm (0.5 inches)83%very high

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