 this Wednesday as extreme heat arrives weeks before summer. Low humidity and high heat index pose health risks.){kind=link}
Mexicali is expected to reach 42°C (108°F) on Wednesday, June 3, according to Mexico’s National Meteorological System (SMN), with the heat index climbing as high as 44°C (111°F). The forecast marks the beginning of a punishing stretch of heat for the Baja California capital, weeks before summer officially starts on June 21.
Temperatures across the week will range from 37°C to 42°C (99°F to 108°F) between Monday and Friday. Humidity will remain low, between 18% and 20%, with light to moderate winds offering little relief. The dry desert air can make the heat deceptive, as dehydration sets in faster than many people expect.
City Already on Alert for Early Heat
Mexicali’s municipal government has been preparing for extreme heat earlier than usual this year. In March, Mayor Norma Alicia Bustamante Martínez announced the city would fast-track emergency heat relief measures after unseasonable warmth arrived well ahead of schedule. Those protocols include hydration stations and public cooling centers.
The city, located in the Sonoran Desert just south of the California border at Calexico, routinely records some of the highest temperatures in North America. Average July highs reach 42°C, so this week’s forecast puts Mexicali at peak summer levels a full month early. Last August, the city broke its all-time record at 52.7°C (127°F), and heat-related deaths were reported as early as July 2025.
Health Risks in Extreme Dry Heat
Heat exhaustion and heat stroke can develop rapidly at these temperatures, particularly for outdoor workers, older adults, and visitors unaccustomed to desert conditions. Health authorities recommend staying indoors during peak afternoon hours, typically between noon and 5 p.m. Drinking water before feeling thirsty is essential, since low humidity accelerates fluid loss through evaporation.
Residents who cross the border regularly should note that temperatures on the Calexico side will be comparable. Anyone driving between Mexicali and other parts of Baja California should carry extra water and check vehicle cooling systems before long trips through the desert.
The week-ahead forecast gives residents and visitors a planning window to stock up on water, check air conditioning units, and adjust outdoor schedules accordingly.
This report is based on forecasts published by The Baja Post, citing data from Mexico’s SMN.