San Juan, Weather & Growing Conditions
Today
89°F
Scattered Rain Showers
Scattered rain showers. Mostly sunny, with a high near 89. Heat index values as high as 102. East northeast wind 13 to 16 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Scattered Rain Showers | 13 to 16 mph ENE | 30% |
| Tonight | 79°F | Scattered Rain Showers | 7 to 13 mph E | 40% |
| Wednesday | 91°F | Scattered Rain Showers | 7 to 17 mph E | 40% |
| Wednesday Night | 79°F | Isolated Rain Showers | 7 to 13 mph ESE | 20% |
| Thursday | 89°F | Mostly Sunny then Scattered Rain Showers | 8 to 16 mph ESE | 30% |
| Thursday Night | 79°F | Isolated Rain Showers | 7 to 12 mph E | 10% |
| Friday | 89°F | Isolated Rain Showers | 7 to 16 mph E | 20% |
| Friday Night | 79°F | Scattered Rain Showers | 8 to 13 mph E | 30% |
| Saturday | 91°F | Isolated Rain Showers | 8 to 15 mph E | 9% |
| Saturday Night | 81°F | Isolated Rain Showers | 8 to 12 mph E | 10% |
| Sunday | 92°F | Scattered Rain Showers | 9 to 17 mph E | 30% |
| Sunday Night | 80°F | Clear | 8 to 13 mph E | 0% |
| Monday | 90°F | Isolated Rain Showers then Sunny | 9 to 17 mph E | 10% |
| Monday Night | 80°F | Isolated Rain Showers | 8 to 13 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Juan,
Growing season
365 days
Explore more for San Juan, : full frost dates · planting calendar
Climate data from the nearest NOAA station, Rio Piedras Exp Stn, Pr Rq (0.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.