textproduct: San Juan

KEY MESSAGES

Issued at 435 AM AST Fri Nov 13 2026

- Generally fair weather conditions will dominate throughout the weekend, however, isolated showers could still form across the USVI and PR's windward areas in the mornings, with localized afternoon showers developing across southern and northwest PR.

- Above-normal temperatures are expected to continue, mainly across coastal areas, lowlands, interior valleys, and urban zones. Stay hydrated and reduce sun exposure during the peak heat hours.

- Breezy southeast winds today and Saturday, particularly across coastal areas. Unsecured items could blow around.

- Life-threatening rip currents will remain possible (moderate risk) today and through the weekend across all local beaches of PR and USVI. By early next week, the moderate risk will persist along north-exposed beaches.

Short Term(Today through Sunday)

Issued at 435 AM AST Fri Nov 13 2026

Fair weather conditions prevailed during the overnight period, with only a few isolated showers across the southeastern corner of Puerto Rico. Surface observations registered temperatures in the mid to upper 70s across coastal areas and in the 60s to low 70s across mountainous regions. Southeast winds ranged from 10 to 15 mph across most areas, with slightly stronger and gustier conditions across the mountainous regions.

A broad surface high-pressure across the central Atlantic and a tight pressure gradient across the eastern Caribbean will promote breezy southeasterly winds today and Saturday, particularly across coastal areas. Unsecured items could be blown around. Winds are expected to gradually return to normal by Sunday. Aloft, a mid to upper-level ridge persisting over the region will maintain subsidence and dry air aloft, favoring generally fair weather across Puerto Rico and the U.S. Virgin Islands throughout the forecast period. The latest satellite imagery and model guidance are in good agreement, suggesting that precipitable water values will fluctuate between 1.2 and 1.8 inches from Friday through Sunday. These values are below normal to near seasonal levels based on November climatological data. Overall, morning showers may still develop across windward areas of the islands today, followed by passing showers across southern to southeastern portions of Puerto Rico during the afternoon. Diurnal heating and local effects could trigger isolated to scattered showers across northwestern Puerto Rico, although the overall chance remains low. Atmospheric dynamics are not favorable for significant vertical development, and low concentrations of Saharan dust are present across the region. Therefore, any showers that develop should remain shallow and short-lived. A similar weather pattern is expected to persist throughout the weekend.

Above-normal temperatures will remain a persistent weather hazard in the short term. Today, moisture levels will decrease slightly, while winds will become breezier compared to yesterday. These conditions could help slightly reduce heat indices or confine the highest values to more localized areas. However, coastal areas, lowlands, interior valleys, and urban areas could still experience hot conditions. Residents and visitors are encouraged to stay hydrated and monitor the forecast, in case heat-related products are issued as the day progresses.

Long Term(Monday through Friday)

Issued at 435 AM AST Fri Nov 13 2026

Next week's weather will be influenced by intermittent easterly disturbances dragging pulses of moisture into the islands until Wednesday, which will maintain moisture content at seasonal to above- seasonal levels by the first half of the week. However, a persistent mid-level ridge over the central Atlantic Ocean will promote subsidence at the mid-levels which may be a limiting factor to deeper convection. The first pulse of moisture should arrive on Monday morning, which will enhance showers across windward sections and localized afternoon convection over the interior to western portions of Puerto Rico driven by a gentle to moderate easterly wind flow. Lingering moisture on Tuesday will promote a similar pattern. Winds are forecasted to change to a more ESE flow by Wednesday onwards, promoting shower and thunderstorm development towards northwestern portions of Puerto Rico. On Thursday morning, a patch with less moisture content should reach the CWA, nonetheless, moisture content should remain at seasonal levels. Seasonal moisture in the low-levels, diurnal heating and topographic effects could promote activity towards the northern and northwestern portions of Puerto Rico. This scenario will maintain a slight risk of flooding until Wednesday. Hence, a threat of ponding of water over roadways and poorly drained areas, along with isolated urban and small stream flooding will be present during the first half of the work week.

AVIATION

(06Z TAFS) Issued at 435 AM AST Fri Nov 13 2026

Mainly VFR conditions are expected to prevail across all TAF sites during the forecast period. However, locally induced VCSH/-SHRA may develop in and around TJBQ/TJPS between 13/17-21Z. This can result in intermittent/brief MVFR conds. SE winds up to around 10 to 15 kt with sea breeze variations and gusts up to 18 to 22 kt expected aft 13/14z.

MARINE

Issued at 435 AM AST Fri Nov 13 2026

A surface high pressure over the central Atlantic Ocean will continue to strengthen east-southeast winds today through Saturday, with winds of 15 to 20 knots and gusts up to 30 knots. This will induce wind-driven seas, producing choppy to locally rough conditions, with seas between 3 to 6 feet, occasionally reaching up to 8 feet across offshore waters and local passages. Shower and isolated thunderstorm activity may produce locally higher winds and seas. These conditions should improve by Sunday into early next week.

BEACH FORECAST

Issued at 435 AM AST Fri Nov 13 2026

A moderate risk of life-threatening rip currents will persist across most local beaches until Sunday. Beginning Monday, an improvement is expected as the risk decreases over most southern beaches.

Beachgoers should remain cautious as life-threatening rip currents are possible in the surf zone across most local beaches until early next week. In addition, while on Monday onwards the risk of life- threatening rip currents decreases over most southern beaches, isolated stronger rip currents may occur along these beaches.

In addition, regardless of the low chance of thunderstorm development for the next days, isolated activity producing lightning pose another beach hazard, particularly during the afternoon hours. If thunder is heard, get out of water and seek shelter immediately.

SJU WATCHES/WARNINGS/ADVISORIES

PR...None. VI...None. AM...None.