Issued by: National Weather Service San Juan, PR
Updated: 3:55 am AST May 2, 2026
| Overnight | Isolated showers. Partly cloudy, with a low around 75. East southeast wind around 6 mph. Chance of precipitation is 10%. |
| Saturday | Scattered showers, mainly between 9am and noon. Mostly sunny, with a high near 89. East wind 7 to 14 mph. Chance of precipitation is 30%. |
| Saturday Night | Isolated showers. Partly cloudy, with a low around 76. East southeast wind 7 to 9 mph. Chance of precipitation is 20%. |
| Sunday | Isolated showers. Mostly sunny, with a high near 89. East southeast wind 6 to 14 mph. Chance of precipitation is 20%. |
| Sunday Night | Isolated showers. Partly cloudy, with a low around 76. East southeast wind 6 to 8 mph. Chance of precipitation is 20%. |
| Monday | Isolated showers. Mostly sunny, with a high near 90. East southeast wind 11 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. |
| Monday Night | Mostly clear, with a low around 76. East southeast wind 5 to 7 mph. |
| Tuesday | Mostly sunny, with a high near 91. East southeast wind 6 to 14 mph. |
| Tuesday Night | Partly cloudy, with a low around 76. East southeast wind 5 to 7 mph. |
| Wednesday | Mostly sunny, with a high near 89. |
| Wednesday Night | Partly cloudy, with a low around 76. |
| Thursday | Scattered showers. Mostly sunny, with a high near 89. Chance of precipitation is 40%. |
| Thursday Night | Partly cloudy, with a low around 75. |
| Friday | Scattered showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%. |
376 FXCA62 TJSJ 020856 AFDSJU Area Forecast Discussion National Weather Service San Juan PR 456 AM AST Sat May 2 2026 ...New SHORT TERM, LONG TERM, AVIATION, MARINE, BEACH FORECAST... .KEY MESSAGES... Updated at 453 AM AST Sat May 2 2026 * A limited flooding risk will develop across northwestern Puerto Rico this afternoon due to localized heavy showers. * A drying trend will develop through the weekend, promoting generally fair weather conditions into early next week, with locally induced afternoon showers over western Puerto Rico. * Warmer-than-normal temperatures will persist, with heat indices reaching or exceeding 100F across urban and coastal areas. * A moderate risk of rip currents will continue along north- and east-facing beaches of Puerto Rico and the U.S. Virgin Islands. && .Short Term(Today through Monday)... Issued at 453 AM AST Sat May 2 2026 A very tranquil night with mostly clear to partly cloudy skies prevailed across Puerto Rico and the U.S. Virgin Islands. This pattern will continue through the morning hours. However, enough low-level moisture (PWAT around 1.6-1.8 inches) will combine with diurnal heating and sea breeze convergence to promote afternoon showers and isolated thunderstorms. Activity will be focused on the interior and northwestern Puerto Rico, where localized heavy rainfall could lead to ponding of water in roads and poorly drained areas, with a low chance of urban and small stream flooding. A pronounced drying trend will develop through Sunday into Monday. PWAT values are forecast to decrease to near 1.3 inches by Sunday and drop to below two standard deviations of climatological normal by Monday, with a marked reduction in mid-level moisture. Although some troughiness aloft will persist, a building ridge will promote increasingly stable conditions. Therefore, mostly fair weather is expected, with only brief afternoon showers over western Puerto Rico and no flooding risk expected. Temperatures will remain above normal, driven by southerly low-level flow advecting a warmer air mass, which is reflected in an increasing trend of above-normal 925 mb temperatures. This will support highs in the upper 80s to low 90s and heat indices likely exceeding 100F across coastal and urban areas. && .Long Term(Tuesday through Saturday)... Issued at 453 AM AST Sat May 2 2026 A series of surface highs and frontal lows over the Atlantic will continue to influence steering flow throughout the period. The period will start with light to moderate ESE winds on Tuesday through at least Thursday night, this flow will continue to steer moisture towards the region. Current model guidance suggests that steering flow will become more variable Thursday night into Friday turning more NE to E. Diurnal heating and local effects will induce afternoon convection over mainly interior to W-NW PR Tuesday and Wednesday while passing showers continue to be steered over windward sectors, however mainly fair (but warm) weather conditions will prevail. Most available moisture will be limited to below 800 mb through most of the period as a mid-level ridge caps it off. Available moisture will increase somewhat to end the period. Precipitable water (PWAT) values will start at below normal to normal, gradually increasing to more normal values as the period continues particularly Thursday onwards. By Thursday, an upper-level trough will also begin to amplify and approach the region from the north and east, briefly increasing instability (500 mb temps are forecast to cool to low end normal to below normal values) and the potential for shower and isolated t-storm development. Model guidance now suggests that this feature should linger northeast of the area on Friday. This has the chance to increase afternoon convection, including showers and isolated t-storms, over mainly interior to W-NW PR on Thursday and possibly over mainly interior to W-SW-S PR on Friday, prompting a limited flooding risk both days. 925 mb temperatures are still forecast at above normal values for this time of the year. Prevailing ESE flow through most of the periods and available humidity will prompt a limited heat risk for urban and coastal areas of the islands with highs in the upper 80s to low 90s at lower elevations, and in the upper 70s to mid-80s in higher elevations. Heat indices will reach the upper 90s to low 100s degrees each day. Low concentrations of saharan dust will filter into the area during the period. && .AVIATION... (06Z TAFS) Issued at 453 AM AST Sat May 2 2026 Mainly VFR conds expected across all terminals. However, locally induced SHRA/TSRA over interior and NW PR will result in brief MVFR and -SHRA/VCTS across TJBQ/TJSJ btw ~17-22Z. Winds generally E-SE 8-14 kt with sea breeze variations and higher gusts near SHRA/TSRA. The 02/00Z sfc sndg indicated winds up to 17 kt blo FL050. && .MARINE... Issued at 453 AM AST Sat May 2 2026 A broad high pressure over the central Atlantic will maintain light to moderate east to east-southeast winds across the local waters through the weekend and into early next week. Seas will generally range between 3 and 5 feet, occasionally up to 6 feet, driven by a combination of local wind waves and a small, long-period northeasterly swell. Passing showers and isolated thunderstorms may produce locally higher winds and seas at times. Overall, marine conditions will remain generally favorable for small craft through early next week. && .BEACH FORECAST... Issued at 453 AM AST Sat May 2 2026 A moderate risk of rip currents will continue across the north- and east-facing beaches of Puerto Rico and the U.S. Virgin Islands through the next several days and into the latter part of next week. A small, long-period northeasterly swell will occasionally promote higher breakers and stronger rip currents, particularly along the north-facing beaches of Puerto Rico. Some improvement is possible by Thursday, especially across portions of the north coast, but hazardous conditions may persist at times. Beachgoers should exercise caution. For additional information, visit weather.gov/beach/sju. && .SJU WATCHES/WARNINGS/ADVISORIES... PR...None. VI...None. AM...None. && $$ SHORT TERM/AVIATION...CVB LONG TERM...MRR MARINE/BEACH...ICP
