| NWS Forecast for: St.Thomas...St. John.. and Adjacent Islands Issued by: National Weather Service San Juan, PR Last Update: 243 PM AST Mon May 18 2026 |  |
| Tonight: Partly cloudy with isolated showers. Breezy with lows around 81. East winds 20 to 25 mph. Chance of rain 20 percent. Tuesday: Breezy. Variably cloudy in the morning, then becoming partly cloudy. Scattered showers. Highs around 90. East winds 20 to 25 mph. Chance of rain 40 percent. Tuesday Night: Breezy. Partly cloudy with isolated showers in the evening, then clear after midnight. Lows around 81. East winds 20 to 25 mph. Chance of rain 20 percent. Wednesday: Breezy. Variably cloudy in the morning, then becoming mostly cloudy. Scattered showers. Highs around 90. East winds 20 to 25 mph. Chance of rain 50 percent. Wednesday Night: Breezy. Mostly clear. Isolated showers after midnight. Lows around 81. East winds 20 to 25 mph. Chance of rain 20 percent. Thursday: Breezy. Variably cloudy with scattered showers. Highs around 90. Chance of rain 40 percent. Thursday Night: Breezy. Variably cloudy with scattered showers. Lows around 81. Chance of rain 30 percent. Friday: Breezy. Variably cloudy with scattered showers in the morning, then partly cloudy with isolated showers in the afternoon. Highs around 90. Chance of rain 40 percent. Friday Night: Breezy. Partly cloudy with isolated showers. Lows around 81. Chance of rain 20 percent. Saturday: Breezy. Partly cloudy with isolated showers in the morning, then mostly cloudy with scattered showers in the afternoon. Highs around 90. Chance of rain 50 percent. Saturday Night: Breezy. Variably cloudy with scattered showers. Lows around 81. Chance of rain 30 percent. Sunday: Breezy. Variably cloudy with scattered showers in the morning, then partly cloudy with isolated showers in the afternoon. Highs around 90. Chance of rain 30 percent. Sunday Night: Breezy. Variably cloudy with scattered showers. Lows around 81. Chance of rain 40 percent. Memorial Day: Breezy. Mostly cloudy with scattered showers. Highs around 90. Chance of rain 50 percent. | |
| Zone Forecast: St.Thomas...St. John.. and Adjacent Islands | |
Visit your local NWS office at: https://www.weather.gov/sju |