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September Weather in Mexico, United States

Last updated: June 24, 2025

In Mexico, United States during September, the average temperature hovers around 18°C (64°F). Expect a minimum of 4°C (40°F) and the potential for a balmy maximum of 31°C (88°F). Rainfall can be anticipated with an average precipitation amount of 92 mm (3.6 in) over 9 days. Additionally, the average humidity is relatively high at 78%, creating a warm and humid atmosphere.

September Temperature in Mexico

In September in Mexico, the average temperature is 18°C (64°F). Maximum temperatures can reach 31°C (88°F), while minimum temperatures can drop to as low as 4°C (40°F). This variability makes Mexico a versatile destination, perfect for travelers looking to enjoy both warm days and cool evenings.

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

The chart illustrates September temperature patterns in Mexico, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mexico, September typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (88°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec262733445565727164544032
Data source: Temperature data for Mexico 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 Mexico

In Mexico in September, the precipitation amount is 92 mm (3.6 in) during 9 days, indicating a relatively wet period for the region.

September Precipitation Trends in Mexico

The chart displays monthly precipitation patterns in Mexico, 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 Mexico, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec108107951301219717611792182132133
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mexico

In Mexico in September, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.

September Average Humidity in Mexico

This chart illustrates the average monthly humidity levels in Mexico, 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 Mexico is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mexico

In Mexico in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Mexico.

Maximum UV Index Levels in Mexico for September

The chart shows the monthly maximum UV Index (UVI) for Mexico 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 Mexico typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997532
Data source: Mexico 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 Mexico Compares to Other Months

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

This table compares monthly weather conditions in Mexico, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)108 mm (4.3 inches)90%low
February Weather-3°C (28°F)107 mm (4.2 inches)90%moderate
March Weather1°C (34°F)95 mm (3.8 inches)87%high
April Weather7°C (44°F)130 mm (5.1 inches)88%very high
May Weather13°C (56°F)121 mm (4.8 inches)82%very high
June Weather18°C (65°F)97 mm (3.8 inches)79%very high
July Weather22°C (72°F)176 mm (6.9 inches)78%very high
August Weather22°C (71°F)117 mm (4.6 inches)76%very high
September Weather18°C (64°F)92 mm (3.6 inches)78%high
October Weather12°C (54°F)182 mm (7.2 inches)84%moderate
November Weather4°C (40°F)132 mm (5.2 inches)89%moderate
December Weather0°C (32°F)133 mm (5.3 inches)86%low

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