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. In Mexico City, in September, during 25.7 rainfall days, 116mm (4.57") of precipitation is typically accumulated.
• Guadalajara - September »
  In Guadalajara in September, during 26.5 rainfall days, 132mm (5.2") of precipitation is typically accumulated. Guadalajara records an average high-temperature of a still warm 25.5°C (77.9°F) as September arrives, nearly mirroring the previous month's climate.
• Monterrey - September »
  As Monterrey moves into September, the city experiences a noticeable reduction in temperature down to 27.6°C (81.7°F) from the summer excesses, indicating the onset of autumn. With an average relative humidity of 69%, September is the most humid month in Monterrey, Mexico.
• Puebla - September »
  In Puebla in September, it is raining for 26.8 days, with typically 173mm (6.81") of accumulated precipitation. In Puebla, in September, it is raining for 26.8 days, with typically 173mm (6.81") of accumulated precipitation.
• Tijuana - September »
  August and September, with an average sea temperature of 20°C (68°F), are months with the warmest seawater in Tijuana, Mexico. On the first day of September in Tijuana, Mexico, sunrise is at 6:23 am and sunset at 7:13 pm.
• Ciudad Juarez - September »
  On the last day of September, in Ciudad Juarez, sunrise is at 5:58 am and sunset at 5:52 pm MST. The average high-temperature and low-temperature in Ciudad Juarez during September are 29.5°C (85.1°F) and 20.3°C (68.5°F) respectively.
• Leon - September »
  September is the most humid month in Leon with an average relative humidity of 77%. In Leon, Mexico, during September, the rain falls for 21.1 days and regularly aggregates up to 71mm (2.8") of precipitation.
• Merida - September »
  The months with the highest humidity in Merida, Mexico, are September and October, with an average relative humidity of 78%. September and October, with an average relative humidity of 78%, are the most humid months in Merida.
• San Luis Potosi - September »
  The start of September in San Luis Potosi sees the average high-temperature at a pleasant 22.7°C (72.9°F), showing little difference from August's 24.5°C (76.1°F). With an average relative humidity of 74%, September is the most humid month in San Luis Potosi.
• Querétaro - September »
  September is the most humid month in Querétaro, Mexico, with an average relative humidity of 61%. On the first day of September in Querétaro sunrise is at 6:25 am and sunset at 6:57 pm.
• Mexicali - September »
  In Mexicali, during September, the rain falls for 4.3 days and regularly aggregates up to 10mm (0.39") of precipitation. On the first day of September in Mexicali sunrise is at 6:16 am and sunset at 7:06 pm.
• Hermosillo - September »
  In Hermosillo during September, the rain falls for 11.8 days and regularly aggregates up to 59mm (2.32") of precipitation. On the first day of September in Hermosillo, sunrise is at 6:01 am and sunset at 6:46 pm.