textproduct: San Juan

KEY MESSAGES

Issued at 250 AM AST Tue Jul 14 2026

* A Heat Advisory is in effect from 10 AM to 5 PM today due to dangerous temperatures and heat indices expected across coastal and urban areas of Puerto Rico and the U.S. Virgin Islands.

* Dry conditions will prevail today, significantly limiting the development and coverage of shower activity across the region.

* Moderate concentrations of Saharan dust will continue across the region, resulting in hazy skies and filtering the sunshine.

* A steady increase in low-level moisture and a disturbance is forecast for Thursday, leading to a gradual return of diurnal showers and thunderstorms.

* Breezy conditions will maintain choppy seas for mariners and a moderate risk of rip currents across most local beaches.

AVIATION

(06Z TAFS) Issued at 250 AM AST Tue Jul 14 2026

Mainly VFR conditions will prevail across all local terminals during the period. Moderate concentrations of Saharan dust will maintain hazy skies across the region throughout the day. Visibility may drop slightly to around 6 SM at times, but should remain within VFR thresholds. Winds will remain variable and up to 10 knots increasing at 07/14Z from the east-southeast at 10-15 knots, with gusts up to 25 knots. High-level cloudiness will continue to cross the local flying area affecting the FL030 and FL050. Isolated afternoon showers could develop over western PR, but impacts to TJBQ are minimal.

MARINE

Issued at 250 AM AST Tue Jul 14 2026

A surface high over the central Atlantic interacting with the PanamaColombia Low will maintain a tight pressure gradient across the region, supporting moderate to fresh east-southeast winds and moderate to choppy seas through at least Thursday. A drier air mass accompanied by moderate to high concentrations of Saharan dust will continue to spread across the region through Wednesday, resulting in hazy skies and locally reduced visibility. A trade wind perturbation is expected to move through the area around Thursday, increasing the potential for passing showers and isolated afternoon thunderstorms.

BEACH FORECAST

Issued at 250 AM AST Tue Jul 14 2026

An east to east-southeast wind flow will maintain a moderate risk of life-threatening rip currents today along the north, east, and southeast-facing beaches of Puerto Rico, Vieques, Culebra, and St. Croix. This pattern will persist through much of the week, with the rip current risk expanding to most local beaches by the weekend. Beachgoers should swim near lifeguards whenever possible, heed beach warning flags, and never swim alone.

An elevated to extreme heat risk is also expected at many local beaches today through the first half of the week. Stay well hydrated, seek shade whenever possible, and apply sunscreen to help reduce the risk of heat-related illnesses.

FIRE WEATHER

Issued at 250 AM AST Tue Jul 14 2026

A dry air mass and Saharan dust will continue to dominate the region today, keeping the fire danger risk elevated. This dry weather pattern will cause relative humidity (RH) levels to drop to critical threshold values between 40% and the low 50s during the early afternoon hours. In addition to the low humidity, winds will be favorable for rapid fire spread, blowing from the east- southeast at 10 to 15 mph with higher gusts.

Because of these critical conditions, a Fire Danger statement has been issued for most sections of the southern plains and across the northern coastal sectors of the island. Any fires that ignite in these areas could spread quickly and become difficult to control. Additional Red Flag Warning conditions are briefly possible; however, the limiting factor will be the south wind component that can trigger changes in the RH values.

SJU WATCHES/WARNINGS/ADVISORIES

PR...Heat Advisory from 10 AM this morning to 5 PM AST this afternoon for PRZ001>005-007-008-010>013.

VI...Heat Advisory from 10 AM this morning to 5 PM AST this afternoon for VIZ001-002.

AM...None.