September weather forecast
Mexico

September signals the transition from the sultry summer to the more moderate autumn season in Mexico. The heat begins to wane, and while rainfall decreases, it remains significant in several regions.

In the northern regions, defined by their arid and semi-arid climates, average daytime temperatures start to descend, settling between 35°C (95°F) and 45°C (113°F). Night temperatures also cool slightly, averaging from 20°C (68°F) to 25°C (77°F), offering a soothing contrast to the still warm days.

In Mexico City, located in the southern part of the central plateau, September temperatures range between 18°C (64.4°F) and 28°C (82.4°F). The city's altitude continues to contribute to cooler nights, providing relief from the daytime warmth.

The south-central high mountain regions, including Pico de Orizaba, experience cooler temperatures ranging from 4°C (39.2°F) to 14°C (57.2°F) during September. The absence of snowfall remains a characteristic feature of this month in these regions.

On the Yucatan Peninsula, the heat gradually reduces in September, with average temperatures easing between 24°C (75.2°F) and 34°C (93.2°F). Despite this slight decrease in temperature, the region's tropical climate persists, emphasized by high rainfall.

The coastal areas of Baja California, too, experience a mild reduction in temperatures with averages varying between 23°C (73.4°F) and 29°C (84.2°F). The sea breeze continues to offer respite from the warm climate, making these coastal regions still suitable for beach activities.

In September, Mexico's rainy season starts to recede. The southern regions, such as the Yucatan Peninsula and the southern Pacific coast, still receive substantial rainfall with precipitation averages around 210mm (8.27"). The northern regions and the highlands see a reduction in rainfall compared to August, averaging about 60mm (2.36"). Despite the reduction, September's rainfall is essential for sustaining agriculture and replenishing water reserves. In essence, September in Mexico offers a blend of weather conditions as it marks the transition from the hot, rainy summer to the milder autumn season.

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• Mexico City - September »
  The month of September signals a shift in the weather landscape in Mexico City, with rainfall quantities decreasing and temperatures showing considerable stability. September is the most humid month in Mexico City, with an average relative humidity of 77%.
• Guadalajara - September »
  The initiation of September in Guadalajara sees an average high-temperature of a still moderately hot 25.5°C (77.9°F), showing minor variations from the previous month. In Guadalajara during September, the rain falls for 26.5 days and regularly aggregates up to 132mm (5.2") of precipitation.
• Monterrey - September »
  The most humid month in Monterrey is September, with an average relative humidity of 69%. In Monterrey, Mexico, in September, during 22.8 rainfall days, 101mm (3.98") of precipitation is typically accumulated.
• Puebla - September »
  The most humid month in Puebla, Mexico, is September, with an average relative humidity of 82%. The most humid month in Puebla is September, with an average relative humidity of 82%.
• Tijuana - September »
  In Tijuana during September, the rain falls for 4.1 days and regularly aggregates up to 8mm (0.31") of precipitation. Tijuana signifies an average high-temperature of a still moderately hot 26.7°C (80.1°F) in September, closely mirroring the 27.3°C (81.1°F) of August.
• Ciudad Juarez - September »
  In Ciudad Juarez, in September, during 10.2 rainfall days, 25mm (0.98") of precipitation is typically accumulated. On the first day of September in Ciudad Juarez, sunrise is at 5:41 am and sunset at 6:29 pm.
• Leon - September »
  In Leon in September, during 21.1 rainfall days, 71mm (2.8") of precipitation is typically accumulated. On the first day of September in Leon, sunrise is at 6:30 am and sunset at 7:02 pm.
• Merida - September »
  The months with the highest humidity in Merida, Mexico, are September and October, with an average relative humidity of 78%. In Merida, in September, during 20.4 rainfall days, 70mm (2.76") of precipitation is typically accumulated.
• San Luis Potosi - September »
  The most humid month in San Luis Potosi is September, with an average relative humidity of 74%. On the first day of September in San Luis Potosi, sunrise is at 6:27 am and sunset at 7:00 pm.
• Querétaro - September »
  September is the most humid month in Querétaro, with an average relative humidity of 61%. In Querétaro, in September, during 7.5 rainfall days, 70mm (2.76") of precipitation is typically accumulated.
• Mexicali - September »
  In Mexicali, in September, it is raining for 4.3 days, with typically 10mm (0.39") of accumulated precipitation. In Mexicali, in September, it is raining for 4.3 days, with typically 10mm (0.39") of accumulated precipitation.
• Hermosillo - September »
  In Hermosillo, Mexico, during September, the rain falls for 11.8 days and regularly aggregates up to 59mm (2.32") of precipitation. In Hermosillo, during September, the rain falls for 11.8 days and regularly aggregates up to 59mm (2.32") of precipitation.