Flash Flood in Guaynabo Municipio, Puerto Rico

Flash Flood in Guaynabo Municipio, Puerto Rico: 67 recorded events between 2009 and 2025. The strongest on record measured 0. That places the county #369 nationally and #6 statewide for this hazard.

Reporting practice changed over time — early decades are undercounted, not calmer.

The busiest decade for flash flood in Guaynabo Municipio is the 2010s, when 30 of the county's 67 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.

Within the Guaynabo Municipio archive, flash flood makes up 47.5% of all recorded severe weather across 7 hazard types. Nationally the county sits at #369 for this hazard and #6 within Puerto Rico, putting it in the 87.8 percentile of all U.S. counties.

May is the peak month for flash flood in Guaynabo Municipio with 12 recorded events, while Feb is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.

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How many flash flood events are on record in Guaynabo Municipio, Puerto Rico?

67 flash flood events are recorded in Guaynabo Municipio between 2009 and 2025, causing 0 direct deaths.

What is the strongest flash flood recorded in Guaynabo Municipio?

The strongest flash flood on record in Guaynabo Municipio measured 0.

Where does the flash flood data for Guaynabo Municipio come from?

All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.