Averages from 2021–2025 (150 days of record).
Expect September days in Mexico City, Mexico to top out around 73°F and cool to about 55°F overnight, with roughly 25 days of measurable rain across the month. In recent years September has ranged from 49°F to 82°F.
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Current Mexico City, Mexico forecast → · Historical data by Open-Meteo (ERA5).