Flash Flooding and Debris Flows in Puerto Rico, September 24 to 27, 2025

Name: Flash Flooding and Debris Flows in Puerto Rico, September 24 to 27, 2025
Start: 2025-09-24T10:24
End: 2025-09-27T18:00
Location: Puerto Rico

September 24 to 27, 2025 · NWS SJU · 17 events in 11 counties and zones

The flooding threat increased as a robust tropical wave moved across the region. This wave combined with instability associated with an upper-level trough.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 1
Injuries: 1
Property damage: $36,000
Crop damage: None recorded
Events: 17

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS SJU wrote it up.

The flooding threat increased as a robust tropical wave moved across the region. This wave combined with instability associated with an upper-level trough. As the wave departed, tropical moisture continued to flux into Puerto Rico. Showers and thunderstorms were numerous, causing flooding, landslide and wind damage.

The radar

The San Juan radar (TJUA), 31 km away, was scanning. The volume nearest the first event began at 14:22 UTC.

Open the radar archive at this moment

Event by event

6 flood, 5 thunderstorm wind, 4 debris flow, 2 flash flood. Local standard time, as filed.

Thunderstorm Wind, San Juan

When: September 24, 10:24 AM AST
Where: San Juan County, 2.06 mi WNW of San Juan
Measured: 26 kt (30 mph) estimated gust
Property damage: $3,000
Reported by: State Official
Coordinates: 18.396, -66.076

A large tree was uprooted and fell, impacting electrical lines. This caused a power outage in a residential area near Centro Medico.

Debris Flow, Mayaguez

When: September 24, 11:30 AM AST to 2:00 PM AST
Where: Mayaguez County, 1.86 mi ENE of Mayaguez to 1.87 mi ENE of Mayaguez
Cause: Heavy Rain
Property damage: $400
Reported by: Broadcast Media
Coordinates: 18.211, -67.094

A broadcast media reported via social media a landslide on PR-106 at kilometer 5.4 in Barrio Quemado. At that time, radar estimates indicated that 1.3 to 1.5 inches of rain had fallen.

Flood, Cabo Rojo

When: September 24, 1:48 PM AST to 4:00 PM AST
Where: Cabo Rojo County, 4.87 mi NW of Cabo Rojo to 4.83 mi NW of Cabo Rojo
Cause: Heavy Rain
Property damage: $400
Reported by: Broadcast Media
Coordinates: 18.075, -67.187

A broadcast media outlet reported via social media flooding caused by poor drainage and clogged sewers on PR-308 in Barrio Miradero, Sector Puerto Real, in front of the Puerto Rico Police Departments Cabo Rojo District station. At that time, radar estimates indicated that 2.0 to 2.2 inches of rain had fallen.

Debris Flow, Coamo

When: September 24, 2:00 PM AST to 5:00 PM AST
Where: Coamo County, 2.24 mi NW of Coamo
Cause: Heavy Rain
Property damage: $4,000
Reported by: County Official
Coordinates: 18.102, -66.375

County officials reported via social media that a landslide of large rocks was blocking part of one lane on PR-155 at kilometer 5.9 in Barrio Pasto. Radar estimates indicated that between 1.0 and 2.0 inches of rain had fallen by the time of the report.

Debris Flow, Trujillo Alto

When: September 24, 2:00 PM AST to 5:00 PM AST
Where: Trujillo Alto County, 0.55 mi NNE of Trujillo Alto to 0.54 mi NNE of Trujillo Alto
Cause: Heavy Rain
Property damage: $400
Reported by: County Official
Coordinates: 18.337, -65.996

County officials reported via social media a landslide blocking one lane on PR-851 at kilometer 0.5 in Barrio La Gloria. At that time, radar estimates indicated that 1.0 to 1.5 inches of rain had fallen.

Thunderstorm Wind, Mayaguez

When: September 24, 2:17 PM AST
Where: Mayaguez County, 2.23 mi ESE of Mayaguez
Measured: 22 kt (25 mph) estimated gust
Property damage: $250
Reported by: Public
Coordinates: 18.192, -67.087

A social media publication showed a small tree knocked down at PR-105 km 8. Estimated wind gusts were around 20-25 mph.

Flash Flood, Yauco

When: September 24, 8:00 PM AST to September 25, 3:45 AM AST
Where: Yauco County, 0.8 mi SSE of Yauco to 0.81 mi SE of Yauco
Cause: Heavy Rain
Deaths: 1 direct, 0 indirect
Injuries: 1 direct, 0 indirect
Property damage: $17,000
Reported by: Emergency Manager
Coordinates: 18.060, -66.843

Rio Cotui went out of its banks, flooding portions of PR-372 in Yauco. A car was washed out with a male inside, the male was later found dead.

Flood, Naguabo

When: September 24, 8:00 PM AST to September 25, 12:00 AM AST
Where: Naguabo County, 2.82 mi W of Naguabo to 2.79 mi W of Naguabo
Cause: Heavy Rain
Property damage: $1,000
Reported by: Emergency Manager
Coordinates: 18.216, -65.773

Emergency managers confirmed flooding along PR-31 and PR-53 at exit 22 in Barrio Rio Blanco in Naguabo due to Rio Blanco (river) overflowing its banks. They proceeded to close the roads as they were impassable.

Thunderstorm Wind, Guayama

When: September 24, 8:08 PM AST
Where: Guayama County, 4.4 mi WNW of Guayama
Measured: 26 kt (30 mph) estimated gust
Property damage: $2,000
Reported by: 911 Call Center
Coordinates: 18.002, -66.193

A utility pole was reported down in the middle of the roadway along PR-713, Simarrona, near Rancho Guayama. Electrical cables were hanging across the pavement, initially obstructing traffic.

Thunderstorm Wind, Utuado

When: September 24, 11:40 PM AST
Where: Utuado County, 3.56 mi SE of Utuado
Measured: 26 kt (30 mph) estimated gust
Property damage: $2,000
Reported by: 911 Call Center
Coordinates: 18.236, -66.659

A utility pole fell at the entrance of a residence in PR-140 km 20 in Bo Las Palmas. Blocking the roadway and leaving power lines hanging across the pavement.

Thunderstorm Wind, San German

When: September 25, 12:30 AM AST
Where: San German County, 0.68 mi W of San German
Measured: 26 kt (30 mph) estimated gust
Property damage: $2,000
Reported by: State Official
Coordinates: 18.100, -67.040

A large tree fell across PR-361 obstructing traffic and a nearby residence.

Flood, Cabo Rojo

When: September 25, 8:19 AM AST to 10:00 AM AST
Where: Cabo Rojo County, 6.52 mi N of Cabo Rojo to 6.47 mi N of Cabo Rojo
Cause: Heavy Rain
Property damage: $400
Reported by: Public
Coordinates: 18.124, -67.136

Social media post reported Rio Viejo out of its banks in the intersection of PR-103 and PR-3311. Road was impassable.

Flash Flood, Cabo Rojo

When: September 25, 9:45 PM AST to September 26, 12:00 AM AST
Where: Cabo Rojo County, 4.82 mi NNW of Cabo Rojo to 5.11 mi NNW of Cabo Rojo
Cause: Heavy Rain
Property damage: $4,000
Reported by: Emergency Manager
Coordinates: 18.095, -67.156

Flooding was reported on Highway PR-100, from the traffic light at the Cabo Rojo COOP to the intersection with the Santa Ana funeral home. PR-100 in the Mayag ez to Cabo Rojo direction and the secondary road are completely impassable.

Flood, Cabo Rojo

When: September 25, 9:45 PM AST to September 26, 12:00 AM AST
Where: Cabo Rojo County, 2.29 mi SW of Cabo Rojo to 2.36 mi SW of Cabo Rojo
Cause: Heavy Rain
Property damage: $400
Reported by: Broadcast Media
Coordinates: 18.003, -67.150

A report was received via social media indicating that PR-301, at the intersection with Camino Las Guanbanas, was completely flooded with standing water due to heavy rains. No stranded vehicles were reported.

Flood, Guaynabo

When: September 27, 2:35 PM AST to 3:45 PM AST
Where: Guaynabo County, 7.14 mi NW of Guaynabo
Cause: Heavy Rain
Property damage: $400
Reported by: Emergency Manager
Coordinates: 18.404, -66.106

Emergency managers reported flooding affecting the exit from Expreso Rafael Marti nez Nadal toward Avenida Gonzalez Giusti/San Patricio Village, in front of Dennis Restaurant near Plaza San Patricio in Guaynabo. The roadway has been closed and is currently impassable for all traffic.

Flood, San Juan

When: September 27, 3:10 PM AST to 3:45 PM AST
Where: San Juan County, 1.69 mi NE of San Juan to 1.76 mi NE of San Juan
Cause: Heavy Rain
Property damage: $400
Reported by: Public
Coordinates: 18.395, -66.030

Social media posts reported flooding along Avenida 65 de Infanteria in front of Concordia Shopping Center.

Debris Flow, Guaynabo

When: September 27, 3:30 PM AST to 6:00 PM AST
Where: Guaynabo County, 6.58 mi WNW of Guaynabo
Cause: Heavy Rain
Property damage: $400
Reported by: Emergency Manager
Coordinates: 18.381, -66.115

Emergency managers reported a small landslide at PR-833 near Urb. La Lomita in Sector Los Filtros in Barrio Frailes.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

Event	Date	Age	Sex	Where	Kind
Flash Flood, Yauco	2025-09-24	36	Male	Vehicle/Towed Trailer	Direct

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Debris Flow: A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Puerto Rico in 2025 Every state in 2025 This day in weather history Warnings in Puerto Rico, September 2025

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1294788, 1294811, 1294796, 1294810, 1294812, 1294787, 1294792, 1294798, 1294791, 1294790, 1294789, 1294800, 1294793, 1294801, 1294808, 1294807, 1294809.