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September Weather in Rio Frio, Mexico

Last updated: August 26, 2025

In Rio Frio, Mexico, the average temperature in September is a mild 18°C (64°F). Expect minimums of around 8°C (47°F) and maximums reaching 27°C (81°F), making it a pleasant yet variable month. Prepare for some rain, as precipitation amounts can hit 137 mm (5.4 in) over 18 days. With an average humidity of 86%, be ready for a humid atmosphere that adds to the unique charm of this time of year.

September Temperature in Rio Frio

In September in Rio Frio, the average temperature is 18°C (64°F). The maximum can reach 27°C (81°F), while the minimum can be as low as 8°C (47°F). This makes it an ideal time for travelers to enjoy mild weather and explore the area comfortably.

September Weather in Rio Frio: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rio Frio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Frio, September typically has an average temperature of 18°C (64°F), with highs reaching up to 27°C (81°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec535763667069666664625753
Data source: Temperature data for Rio Frio 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 Rio Frio

In Rio Frio in September, the total precipitation amount is 137 mm (5.4 in) over the course of 18 days.

September Precipitation Trends in Rio Frio

The chart displays monthly precipitation patterns in Rio Frio, 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 Rio Frio, September typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec171066219416187137501712
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rio Frio

In Rio Frio in September humidity is 86%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as the air becomes thick and sticky, often leading to clammy skin and a constant need for hydration.

September Average Humidity in Rio Frio

This chart illustrates the average monthly humidity levels in Rio Frio, 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 Rio Frio 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 Rio Frio

In Rio Frio 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 Rio Frio, you can check here.

Maximum UV Index Levels in Rio Frio for September

The chart shows the monthly maximum UV Index (UVI) for Rio Frio 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 Rio Frio typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec8111315151414141412108
Data source: Rio Frio 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 Rio Frio Compares to Other Months

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

This table compares monthly weather conditions in Rio Frio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)17 mm (0.7 inches)71%very high
February Weather14°C (57°F)10 mm (0.4 inches)64%extreme
March Weather17°C (63°F)6 mm (0.2 inches)49%extreme
April Weather19°C (66°F)6 mm (0.2 inches)47%extreme
May Weather21°C (70°F)20 mm (0.8 inches)55%extreme
June Weather21°C (70°F)94 mm (3.7 inches)77%extreme
July Weather19°C (67°F)161 mm (6.3 inches)82%extreme
August Weather19°C (67°F)87 mm (3.4 inches)83%extreme
September Weather18°C (64°F)137 mm (5.4 inches)86%extreme
October Weather17°C (62°F)50 mm (2.0 inches)83%extreme
November Weather14°C (58°F)17 mm (0.7 inches)80%very high
December Weather12°C (53°F)12 mm (0.5 inches)83%very high

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