San Diego de la Union is a city of approximately 7,100 people in Guanajuato, Mexico. Located in the Central Time Zone at 21.5°N latitude.
In 2025, San Diego de la Union recorded an average annual temperature of 62°F. The hottest temperatures reached 90°F in May; the coolest were 29°F in January. Total precipitation for the year was 27 inches, with the wettest month being July.
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