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Weather & Climate in Key Largo, FL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Key Largo has a warm climate with an average annual temperature of 78°F (25°C). Winters average 69°F in January while summers reach 84°F in July / relatively mild seasonal variation. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 57.0 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 8 feet.
Temperature
69°F Jan (21°C)
84°F Jul (29°C)
| Annual Average | 77.7°F |
| 44% above US avg | |
| January Average | 69°F (21°C) |
| July Average | 84°F (29°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 8 ft (2 m) |
| Area | 12.1 sq mi (31.2 km²) |
| Population Density | 1,002/sq mi |
| Coordinates | 25.1226°N, 80.4116°W |
| Timezone | America/New_York |
| County | Miami-Dade County County |
| Nearest Airport | Miami International (MIA) 47 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.6 / 100 |
| Social Vulnerability | 75.9 / 100 |
| Community Resilience | 42.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Very High |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | No Rating |
| Lightning | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Hurricane History
21 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2022 | Ian | Category 5 | 161 mph | 245 km |
| 2022 | Nicole | Category 1 | 75 mph | 250 km |
| 2020 | Isaias | Category 1 | 81 mph | 250 km |
| 2019 | Dorian | Category 5 | 178 mph | 267 km |
| 2017 | Irma | Category 4 | 132 mph | 119 km |
| 2016 | Matthew | Category 4 | 138 mph | 209 km |
| 2005 | Wilma | Category 3 | 127 mph | 134 km |
| 2005 | Rita | Category 3 | 109 mph | 159 km |
| 2005 | Dennis | Category 3 | 115 mph | 286 km |
| 2005 | Katrina | Category 2 | 104 mph | 75 km |
| 2004 | Charley | Category 4 | 150 mph | 227 km |
| 2004 | Jeanne | Category 3 | 121 mph | 232 km |
| 2004 | Frances | Category 2 | 109 mph | 228 km |
| 2001 | Michelle | Category 2 | 92 mph | 220 km |
| 1999 | Irene | Category 1 | 81 mph | 72 km |
| 1998 | Georges | Category 2 | 104 mph | 153 km |
| 1996 | Lili | Category 2 | 98 mph | 295 km |
| 1995 | Erin | Category 1 | 86 mph | 243 km |
| 1992 | Andrew | Category 5 | 167 mph | 43 km |
| 1987 | Floyd | Category 1 | 75 mph | 9 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
210 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 194 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 17, 1959 | EF3 | 69 km | 12.7 mi | 0 |
| Apr 10, 1956 | EF3 | 99 km | 7.8 mi | 0 |
| Aug 26, 2005 | EF2 | 82 km | 1.2 mi | 0 |
| Mar 27, 2003 | EF2 | 75 km | 6.0 mi | 1 |
| Nov 4, 1998 | EF2 | 6 km | 12.0 mi | 0 |
| Feb 2, 1998 | EF2 | 77 km | 21.0 mi | 0 |
| Dec 20, 1973 | EF2 | 33 km | 7.6 mi | 0 |
| Jun 22, 1971 | EF2 | 77 km | 2.0 mi | 0 |
| Feb 19, 1968 | EF2 | 91 km | 5.7 mi | 0 |
| Oct 9, 2024 | EF1 | 36 km | 2.9 mi | 0 |
| Sep 27, 2022 | EF1 | 99 km | 5.7 mi | 0 |
| May 24, 2020 | EF1 | 50 km | 4.8 mi | 0 |
| Apr 15, 2018 | EF1 | 21 km | 0.9 mi | 0 |
| Sep 10, 2017 | EF1 | 99 km | 0.3 mi | 0 |
| Sep 9, 2017 | EF1 | 96 km | 0.1 mi | 0 |
| Jan 23, 2017 | EF1 | 78 km | 2.8 mi | 0 |
| Feb 16, 2016 | EF1 | 95 km | 3.8 mi | 0 |
| Sep 10, 2008 | EF1 | 44 km | 0.5 mi | 0 |
| Aug 14, 2008 | EF1 | 81 km | 0.4 mi | 0 |
| Jun 1, 2007 | EF1 | 50 km | 3.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: INGRAHAM (85,437 acres, 1989).
| Year | Name | Acres Burned | Distance |
| 1989 | INGRAHAM | 85,437 | 53 km |
| 2011 | PRAIRIE FIRE | 67,959 | 85 km |
| 1985 | UNNAMED | 54,638 | 80 km |
| 2008 | MUSTANG CORNER | 38,600 | 58 km |
| 2007 | MFC SOUTH FIRE | 37,301 | 86 km |
| 2020 | MOONFISH | 25,819 | 81 km |
| 2001 | UNNAMED | 22,780 | 87 km |
| 2018 | FY 18 COASTAL PRAIRIES | 18,844 | 71 km |
| 1989 | DOF 305 | 17,106 | 68 km |
| 2018 | FY 18 RIVER OF GRASS NE | 16,282 | 67 km |
| 2010 | LOST PRAIRE RX | 13,549 | 89 km |
| 1991 | PACESDIKE | 12,722 | 96 km |
| 1989 | UNNAMED | 11,316 | 80 km |
| 2019 | SOUTH 41 TREATMENT 2 FY19 (LOSTMANS RX) | 11,279 | 90 km |
| 2007 | NE SLOUGH | 10,953 | 69 km |
| 2021 | FOUR SIXTEEN | 9,675 | 32 km |
| 2011 | AFTERNOON | 9,634 | 70 km |
| 2017 | HOLIDAY | 8,858 | 98 km |
| 2001 | LOPEZ | 8,777 | 49 km |
| 1985 | EASTBNDY | 8,523 | 42 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 69°F (21°C) | 1.9 in | |
| February | 69°F (20°C) | 1.8 in | Coldest |
| March | 72°F (22°C) | 1.7 in | |
| April | 75°F (24°C) | 2.2 in | |
| May | 79°F (26°C) | 5.2 in | |
| June | 81°F (27°C) | 8.5 in | Wettest |
| July | 84°F (29°C) | 4.6 in | Warmest |
| August | 83°F (28°C) | 6.0 in | |
| September | 82°F (28°C) | 7.2 in | |
| October | 79°F (26°C) | 5.8 in | |
| November | 75°F (24°C) | 2.5 in | |
| December | 71°F (21°C) | 1.5 in | Driest |
Key Largo has a seasonal temperature swing of 16°F / from 69°F in February to 84°F in July. Total annual precipitation is 48.9 inches, with June being the wettest month (8.5") and December the driest (1.5").