Marine Weather and Tide Forecast for Arroyo, PR

.Short Term(This evening through Wednesday)...
Issued at 132 PM AST Mon Dec 15 2025

Today, mostly calm conditions prevailed across Puerto Rico and the U.S. Virgin Islands, with mostly clear skies during the morning hours and skies becoming partly cloudy during the afternoon as the combination of available moisture, diurnal heating, and local effects promoted the gradual development of some showers, mainly over the interior sections of Puerto Rico. Temperatures across urban and coastal areas remained in the upper 80s to low 90s, while mountain locations stayed in the 70s.

Tonight through Wednesday, winds are expected to remain from the east to southeast at 5 to 15 knots as the local area remains between a frontal boundary and a distant surface high pressure. Model guidance continues to show significant variations in moisture content on Tuesday and Wednesday, with the coldest 500 mb temperatures occurring Tuesday afternoon, around −6 to −7 degrees Celsius, which will favor the development of heavier showers and isolated thunderstorms.

Therefore, expected impacts include ponding of water on roads and in poor drainage areas each day across the islands, with a higher risk of urban and small stream flooding on Tuesday across Puerto Rico.

.Long Term(Thursday through next Sunday)...
Issued at 132 PM AST Mon Dec 15 2025

The forecast remains on track with previous discussions. A building surface high-pressure system over the western Atlantic will continue to push lingering moisture from a frontal boundary into the local area from Thursday into Friday. This will increase the frequency of passing showers across Puerto Rico and the U.S.
Virgin Islands, particularly during the morning hours across the windward portions. As the surface high continues to move over the Atlantic Ocean, another frontal boundary will move east of the eastern coast of the CONUS, promoting a northeasterly wind flow across the area. Under this pattern, cooler temperatures will be felt across the region during the upcoming weekend. By Sunday, another surface high pressure behind the front is expected to strengthen north of the local area, bringing slightly drier conditions; nonetheless, patches of moisture will continue to move into the islands, promoting showers from time to time.

AVIATION
(18Z TAFS)
Issued at 132 PM AST Mon Dec 15 2025

Mainly VFR conditions across all TAF sites. E-SE winds around 10 to 15 kts, with higher gust and sea breeze variations through 15/22Z, bcmg light and variable btw 15/22Z to 16/13Z. SHRA at or in the VCTY of TIST and TISX throughout the overnight period. VCSH also possible along PR terminals.

MARINE
Issued at 132 PM AST Mon Dec 15 2025

Moderate southeast winds and a subsiding long-period northerly swell will result in choppy seas through tonight, mainly across the offshore Atlantic waters. A Small Craft Advisory remain in effect at least through 8 PM tonight across the Atlantic offshore waters. A surface high pressure system will continue to build near the Azores.
A weak cold front and another surface high pressure system will move from the western Atlantic into the central Atlantic over the next few days. This pattern will promote moderate to locally fresh east to southeast trade winds across the local waters, particularly Tuesday onwards. Another long-period northerly swell will reach the Atlantic waters and local passages on Wednesday with Small Craft Advisories likely returning.

BEACH FORECAST
Issued at 132 PM AST Mon Dec 15 2025

A moderate risk of rip currents will continue along most beaches of the islands through mid-week. This means that life-threatening rip currents are possible in the surf zone, and beachgoers are encouraged to exercise caution. The moderate risk of rip currents is expected to prevail across north-facing beaches of Puerto Rico, Culebra, and the U.S. Virgin Islands, with a low risk elsewhere. Remember that even when the risk is low, life- threatening rip currents can still occur, especially near groins, jetties, reefs, and piers.

Late midweek, beach conditions are anticipated to deteriorate again due to increasing winds and a northwesterly swell spreading across the local Atlantic waters. Stay tuned to the forecast! For specific location information, please visit weather.gov/beach/sju.

SJU WATCHES/WARNINGS/ADVISORIES
PR...None.
VI...None.
AM...Small Craft Advisory until 8 PM AST this evening for AMZ711.