Guaynabo Municipio, Puerto Rico

What hazards hit Guaynabo Municipio most?

The most frequent records are floods and flash floods: 158 since 2001. Census land area gives no figure for Guaynabo 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 Guaynabo Municipio?

The most recent record with damage, injuries or deaths is the April 4, 2026 flood ($1,000 in damage in 2025 dollars).

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 Guaynabo 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).

Rip currents and high surf in the 2020-26: 27 records against 9 in the decade before, 27 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Guaynabo Municipio days with a record above.

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

What time of year?

Records by month in Guaynabo Municipio. The two busiest months are in violet.

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

Federal disaster declarations for Guaynabo Municipio

FEMA's register lists 24 declarations that include Guaynabo Municipio: 13 major disasters, 11 emergencies and 0 fire management assistance declarations. Most were for hurricane (14) and severe storm (3).

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 Guaynabo Municipio had?

NOAA's Storm Events Database holds 158 flood or flash flood records for Guaynabo Municipio from 2001 to 2026, on 95 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Guaynabo Municipio ranks 838th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $2.8 million on 245 claims filed in Guaynabo Municipio; the most in one year was 49 in 1998. 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 Guaynabo Municipio

1. San Juan Municipio 702
2. Guaynabo Municipio 319
3. Bayamón Municipio 293
4. Aguas Buenas Municipio 217
5. Cataño Municipio 66

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 Guaynabo MunicipioThe hazard risk calculator: 18 hazards beside the county's record
• Download Guaynabo Municipio's FEMA declarations (CSV)24 rows: every declaration that named the county, for your own analysis