Hurricanes and Tornadoes That Hit Guanica, PR

The nearest NOAA station with 1991–2020 climate normals is Magueyes Is, PR RQ, 10 miles west of Guanica at 12 feet. September is the warmest, with an average high of 91°F and low of 76°F; February is the coolest, at 86°F and 69°F. October is the wettest at 6.3 inches of precipitation on average and January and February the driest at 1.9 inches; the year adds up to 42.6 inches. June to November, the hurricane season months, bring 62% of the year's precipitation (26.4 of 42.6 inches); the other six months are drier. September has brought the most of the 50 tropical systems that passed within 75 miles (24); a normal September there has highs of 91°F and 5.5 inches of precipitation. Highs reach 90°F on about 130 days a year. A night below freezing comes less than once a year on average. That 42.6 inches is more than at 2 of the 21 Puerto Rico stations used on this site (10%). Yauco, 6 miles northeast, has its own station (Adjuntas Substn, PR RQ): 80.2 inches a year, 37.6 more than here, and a September average high of 85°F against 91°F.

Water temperature at the NOAA tide station Magueyes Island, PR, 10 miles west, averaged 88°F in September and 81°F in February over 2021–2025. Sea level at the Magueyes Island tide gauge, 10 miles from Guanica, has risen 0.81 ± 0.06 inches per decade from 1955 to 2025, NOAA's linear trend; at that pace it is 8.1 inches in a hundred years. That is faster than at 41 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 123 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Guanica: 62 flash floods, 43 floods, 9 heavy rain events, 7 thunderstorm wind reports and 2 lightning strikes. They killed 4 people and injured 1, and the NWS estimated $1.4 million in property and crop damage. The strongest thunderstorm gust on record here was 53 mph, on July 17, 2010. May has had the most flash floods, 25 of 62. Of the 86 Puerto Rico cities on this site with a flash flood on record, 32 have had fewer than Guanica.

Flood insurance policyholders in Guanica's ZIP code 00653 have filed 112 claims with the National Flood Insurance Program since 1979, and were paid $291,000 for buildings and contents, in the dollars of each year. The most came from Torrential Rain in 2003: 40 claims (36% of all) and $92,000, then Hurricane Georges in 1998 with 10. 68% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 72 Puerto Rico cities on this site with 10 or more claims, 37 have fewer than Guanica.