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September Weather in Vallecillo, Mexico

Last updated: August 27, 2025

The average temperature in Vallecillo, Mexico during September is a warm 28°C (83°F). Expect a minimum of 16°C (61°F) and a maximum of 40°C (105°F), making it perfect for summer activities. Rainfall is fairly moderate, with an average precipitation of 99 mm (3.9 in) spread across 9 days. Don't forget that the air may feel a bit sticky, with an average humidity of 77%.

September Temperature in Vallecillo

In September in Vallecillo, the average temperature is 28°C (83°F). Maximums can reach 40°C (105°F), and minimums can be as low as 16°C (61°F). This makes it an ideal time for travelers to enjoy warm weather while having the option of cooler evenings.

September Weather in Vallecillo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Vallecillo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vallecillo, September typically has an average temperature of 28°C (83°F), with highs reaching up to 40°C (105°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec596372778386888983756662
Data source: Temperature data for Vallecillo 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 Vallecillo

In Vallecillo in September, the precipitation amount is 99 mm (3.9 in) during a span of 9 days.

September Precipitation Trends in Vallecillo

The chart displays monthly precipitation patterns in Vallecillo, 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 Vallecillo, September typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec181128427253632299452018
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vallecillo

In Vallecillo in September, humidity is 77%. With an average temperature of 28°C (83°F), this humidity feels like walking through a warm, damp blanket, making outdoor activities more challenging and requiring frequent hydration breaks for travelers.

September Average Humidity in Vallecillo

This chart illustrates the average monthly humidity levels in Vallecillo, 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 Vallecillo is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%74%75%74%79%77%64%61%77%83%85%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Vallecillo

In Vallecillo in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Vallecillo.

Maximum UV Index Levels in Vallecillo for September

The chart shows the monthly maximum UV Index (UVI) for Vallecillo 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 Vallecillo typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6910121212121211975
Data source: Vallecillo 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 Vallecillo Compares to Other Months

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

This table compares monthly weather conditions in Vallecillo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)18 mm (0.7 inches)83%high
February Weather17°C (64°F)11 mm (0.4 inches)74%very high
March Weather22°C (72°F)28 mm (1.1 inches)75%very high
April Weather25°C (78°F)42 mm (1.6 inches)74%extreme
May Weather28°C (83°F)72 mm (2.8 inches)79%extreme
June Weather30°C (86°F)53 mm (2.1 inches)77%extreme
July Weather31°C (88°F)63 mm (2.5 inches)64%extreme
August Weather31°C (89°F)22 mm (0.9 inches)61%extreme
September Weather28°C (83°F)99 mm (3.9 inches)77%extreme
October Weather24°C (76°F)45 mm (1.8 inches)83%very high
November Weather19°C (67°F)20 mm (0.8 inches)85%high
December Weather17°C (62°F)18 mm (0.7 inches)89%moderate

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