Mexico City’s civil protection agency (SGIRPC) has forecast a sharp increase in cloud cover from the early afternoon of 15 July, bringing intervals of showers, electrical storms and possible hail. The alert, issued at 07:00 local time, coincides with at least five planned protest concentrations at key points including the Miguel Hidalgo, Iztapalapa and Benito Juárez boroughs, setting up a day of potential mobility disruption for the capital’s 22 million residents.

The meteorological trigger is the interaction between the Mexican monsoon and a series of low-pressure systems over the centre of the country. While the morning began with acceptable air quality and a UV index of zero, the SGIRPC expects winds of 5–25 km/h, gusting to 45 km/h, to accompany the afternoon storms. Maximum temperatures are forecast to reach 26°C before the rain sets in, with accumulated precipitation below 15 mm, ruling out severe weather but leaving streets slick and visibility reduced.

Social organisations have notified authorities of gatherings starting from 09:00, including parents and students at a television station in Santo Tomás, a collective at the Oriente men’s prison, and a labour tribunal protest in Tlalpan. A march by the “Libertad para morir MX” initiative is scheduled at the Nativitas metro station on Line 2. Authorities recommend drivers anticipate delays and seek alternative routes, though no citywide road closures had been confirmed by the morning.

Beyond the capital, the national weather picture is fragmented. The Yucatán Peninsula expects intense heat, with Mérida reaching 38°C under partly cloudy skies, while Nuevo León’s Apodaca could hit 36°C. In contrast, the Puebla–Morelos corridor will see cool, cloudy conditions with lows of 8°C. Colombia’s Andean and Pacific regions face continued rainfall, according to IDEAM, while Brazil’s south enjoys a dry, sunny day as a cold air mass weakens. Mexico’s National Seismological Service reported five tremors between magnitudes 3.5 and 4.3 overnight, none causing damage.

Looking ahead, the SGIRPC maintains a yellow-phase-2 alert for the Popocatépetl volcano, with any ash plume likely to drift west-southwest toward the city. The weather pattern is expected to hold through Thursday, with similar afternoon storm risks. The next update from civil protection will be the key indicator of whether the evening rush hour faces compounding natural and human bottlenecks.