With a population of around 1,600, Primero de Mayo sits in Coahuila, Mexico. The city operates in the America/Monterrey time zone.
In 2025, Primero de Mayo recorded an average annual temperature of 76°F. The hottest temperatures reached 114°F in May; the coolest were 27°F in January. Total precipitation for the year was 7 inches, with the wettest month being July.
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