San Juan, Weather & Growing Conditions

Live forecast is briefly unavailable; the local growing information below is from NOAA climate normals.

Growing snapshot for San Juan,

Explore more for San Juan, : full frost dates · planting calendar

Climate data from the nearest NOAA station, San Juan L M Marin Ap, Pr Rq (3.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.