With a population of around 4,800, La Union sits in Sonora, Mexico. The city operates in the America/Hermosillo time zone.
Recent weather here gives a sense of typical conditions: in 2025, La Union recorded a mean annual temperature of 76°F, ranging from 42°F lows in January to 105°F highs in June, with about 13 inches of precipitation across the year.
View historical weather for La Union · More cities in Sonora