Guayanilla Municipio, Puerto Rico

What hazards hit Guayanilla Municipio most?

The most frequent records are floods and flash floods: 26 since 2003. 42% of its floods and flash floods since 2003 fell in April and May. Census land area gives no figure for Guayanilla Municipio under this code, so it carries no per-area rank.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

When was the last damaging storm in Guayanilla Municipio?

The most recent record with damage, injuries or deaths is the January 21, 2026 strong wind.

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Guayanilla Municipio's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

42% of its floods and flash floods since 2003 fell in April and May. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Guayanilla Municipio

FEMA's register lists 28 declarations that include Guayanilla Municipio: 17 major disasters, 11 emergencies and 0 fire management assistance declarations. Most were for hurricane (11) and severe storm (6).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Guayanilla Municipio had?

NOAA's Storm Events Database holds 26 flood or flash flood records for Guayanilla Municipio from 2003 to 2024, on 21 days, with 2 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Guayanilla Municipio ranks 877th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $1.9 million on 229 claims filed in Guayanilla Municipio; the most in one year was 41 in 1982. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

Counties that share a border with Guayanilla Municipio

1. Adjuntas Municipio 387
2. Yauco Municipio 134
3. Peñuelas Municipio 109
4. Guayanilla Municipio 99
5. Guánica Municipio 75

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Floods in Puerto RicoThe state's floods and flash floods, by county, year and month
• The Puerto Rico recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Guayanilla MunicipioThe hazard risk calculator: 18 hazards beside the county's record
• Download Guayanilla Municipio's FEMA declarations (CSV)28 rows: every declaration that named the county, for your own analysis