National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

San Juan, Luis Munoz Marin International Airport (TJSJ)

Lat: 18.45°NLon: 66°WElev: 10ft.

A Few Clouds

81°F

27°C

Humidity 79%
Wind Speed SE 8 mph
Barometer 29.84 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 18 Aug 4:56 am AST
Extended Forecast for

Cayey PR

Flood Watch August 18, 05:19am until August 18, 08:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch August 18, 05:19am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Flood Watch

  • Overnight

    Low: 72 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 83. South wind 15 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.

    High: 83 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Scattered showers and thunderstorms. Mostly cloudy, with a low around 72. South wind around 7 mph. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 72 °F

    Scattered
    Showers

  • Tuesday

    Tuesday: Scattered showers, mainly after noon. Mostly sunny, with a high near 84. South southeast wind 8 to 10 mph. Chance of precipitation is 30%.

    High: 84 °F

    Scattered
    Showers

  • Tuesday Night

    Tuesday Night: Isolated showers. Widespread haze. Partly cloudy, with a low around 71. East southeast wind around 5 mph. Chance of precipitation is 20%.

    Low: 71 °F

    Isolated
    Showers

  • Wednesday

    Wednesday: Scattered showers, mainly before noon. Widespread haze after noon. Mostly sunny, with a high near 85. East southeast wind 7 to 13 mph. Chance of precipitation is 30%.

    High: 85 °F

    Scattered
    Showers

  • Wednesday Night

    Wednesday Night: Widespread haze. Partly cloudy, with a low around 70. East northeast wind 5 to 8 mph.

    Low: 70 °F

    Haze

  • Thursday

    Thursday: Mostly sunny, with a high near 85. East wind 7 to 10 mph.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South wind around 13 mph. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 83. South wind 15 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Scattered showers and thunderstorms. Mostly cloudy, with a low around 72. South wind around 7 mph. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Scattered showers, mainly after noon. Mostly sunny, with a high near 84. South southeast wind 8 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
Isolated showers. Widespread haze. Partly cloudy, with a low around 71. East southeast wind around 5 mph. Chance of precipitation is 20%.
Wednesday
Scattered showers, mainly before noon. Widespread haze after noon. Mostly sunny, with a high near 85. East southeast wind 7 to 13 mph. Chance of precipitation is 30%.
Wednesday Night
Widespread haze. Partly cloudy, with a low around 70. East northeast wind 5 to 8 mph.
Thursday
Mostly sunny, with a high near 85. East wind 7 to 10 mph.
Thursday Night
Mostly clear, with a low around 70. Northeast wind around 6 mph.
Friday
Mostly sunny, with a high near 85.
Friday Night
Scattered showers. Mostly cloudy, with a low around 70. Chance of precipitation is 50%.
Saturday
Showers likely. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
Scattered showers. Partly sunny, with a high near 83. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cayey PR
 18.11°N 66.17°W (Elev. 1535 ft)
Last Update:
3:57 am AST Aug 18, 2025
Forecast Valid:
5am AST Aug 18, 2025-6pm AST Aug 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation