With a population of around 7,700, San Juan sits in Alajuela Province, Costa Rica. The city operates in the America/Costa Rica time zone.
Recent weather here gives a sense of typical conditions: in 2025, San Juan recorded a mean annual temperature of 69°F, ranging from 53°F lows in March to 87°F highs in March, with about 152 inches of precipitation across the year.
View historical weather for San Juan · More cities in Alajuela Province