Marine Weather and Tide Forecast for Luis M. Cintrón, PR

.Short Term(This evening through Thursday)...
Issued at 253 PM AST Tue Jan 13 2026

High-level cloudiness prevailed throughout most of the morning across all the islands, accompanied by light to moderate showers affecting the exposed waters and briefly streaking over the eastern sides of the islands. As of 12 PM, satellite imagery showed the cloudiness development, mostly across the interior into the western interior. Therefore, shower activity developed across those areas with light to moderate shower activity. Rainfall accumulations from the Doppler Radar were minimal, with the highest value in Trujillo Alto at almost half an inch. Daytime temperatures were near seasonal values. According to unofficial stations, temperatures were in the mid- to upper 80s across coastal areas and near the upper 70s and lower 80s in the interior.

For the rest of the period, the weather will remain mostly stable as the mid- to upper-level ridge continues to dominate the atmospheric pattern. Meanwhile, at the surface, a strong and broad surface high pressure will continue to result in an easterly wind flow. Under this surface pattern, a patch of shallow moisture will filter in, with Precipitable Water Values of 1.2 inches, as shown by GOES-derived satellite imagery, exceeding climatological normal. These surface conditions will be enough to trigger a variable weather pattern tonight, with occasional showers across eastern sections of Puerto Rico and the U.S. Virgin Islands.
Weather conditions will slightly change as the broad surface high pressure extends farther into the western Atlantic and as some influence from the frontal boundary located north of the region.
As a result, veering winds will be present, and a southeasterly flow will be predominant on Wednesday into Thursday. Under this wind flow, moisture from the Caribbean will move into the islands, peaking the 850-500 mb Relative humidity at the 75th percentile on Wednesday. Therefore, the forecast calls for a more showery pattern, with frequent showers across eastern sections and afternoon convection across the interior and northwestern parts of Puerto Rico. On Thursday, similar weather conditions will persist, with precipitable water values similar to those moving into the region, but with some instability as a deep-layer trough stalls over the western Atlantic, weakening the ridge over the area. As a result, colder temperatures are expected at 500 mb, with potential for one or two thunderstorms, with the afternoon showers across the interior and northwestern PR.

.Long Term(Friday through next Monday)...
Issued at 502 AM AST Tue Jan 13 2026

On Friday, model guidance indicates that a frontal boundary will remain north of the region, while a pre-frontal trough may enhance low-level moisture convergence and atmospheric instability, supporting a wetter pattern. Friday currently appears to have the greatest rainfall potential, with a limited flood risk mainly across western Puerto Rico during the afternoon hours. Isolated thunderstorms cannot be ruled out. Precipitable water values are forecast to range between 1.4 and 1.9 inches from Friday through Saturday, near to above climatological normals for this time of year.

Low-level winds will generally remain from the east to southeast at 10 to 15 mph on Friday, then shift to the east to northeast by Friday night into Saturday while increasing to 15 to 20 mph with gusts up to 25 to 30 mph. Breezy to locally windy conditions are expected Saturday and early Sunday, which may lead to loose outdoor items being blown around, especially across exposed and coastal areas.

From Sunday through Tuesday, precipitable water values are expected to decrease to between 1.2 and 1.5 inches, with patches of near-average moisture moving across the region. This will support more variable but seasonable conditions, with passing trade wind showers and limited convective development each afternoon. No flooding concerns at this time.

A subtropical jet streak near 250 mb will establish a favorable dynamic pattern from Tuesday night into Wednesday, supporting upper-level divergence and an induced surface trough. As a result, an increase in the frequency of showers is expected across the forecast area under a northeasterly low-level wind flow. Continue to monitor the forecast updates.

Temperature-wise, ensemble guidance continues to indicate near seasonal to above-normal temperatures across Puerto Rico and the U.S. Virgin Islands throughout the long-term period.

AVIATION
(18Z TAFS)
Issued at 253 PM AST Tue Jan 13 2026

VFR conditions will persist across all TAF sites during the period. VCSH to SHRA will continue near TJSJ, TJBQ & TJPS from now through 13/22Z. Winds will persist from the E-NE up to 11 knots with sea breeze variation, diminishing at 14/03Z./ Hi-Resolution models show an increase in shower activity across the eastern TAF sites from 13/23Z to 14/12Z. No significant operations are forecast.

MARINE
Issued at 253 PM AST Tue Jan 13 2026

A surface high pressure across the central Atlantic and a surface trough to the north of the region will maintain gentle to moderate east to northeast winds through Wednesday, then shifting from the east to southeast by Thursday. This pattern will support passing trade- wind showers, mainly across the Atlantic waters, with occasional showers also moving through the Caribbean passages. By Saturday, strengthening east to northeast winds and the arrival of a long- period northerly swell will likely result in choppy to rough seas, leading to hazardous marine conditions during the weekend. Mariners are advised to continue monitoring the forecast.

BEACH FORECAST
Issued at 253 PM AST Tue Jan 13 2026

A moderate risk of rip currents will continue for the next several days along the northern and eastern beaches of Puerto Rico, as well as Culebra and St. Croix, with breaking waves around 4 feet.
A moderate risk means that life-threatening rip currents are possible within the surf zone, and beachgoers should exercise caution at all times.

Conditions are likely to deteriorate over the weekend as winds increase and the arrival of a long-period northerly swell. This will lead to a high rip current risk across Atlantic exposed beaches of Puerto Rico and the U.S. Virgin Islands. For more location specific information, continue to monitor weather.gov/beach/sju.

SJU WATCHES/WARNINGS/ADVISORIES
PR...None.
VI...None.
AM...None.