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Weather & Climate in Key Biscayne, FL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Key Biscayne has a warm climate with an average annual temperature of 79°F (26°C). Winters average 70°F in January while summers reach 85°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 55.3 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 4 feet.
Temperature
70°F Jan (21°C)
85°F Jul (29°C)
| Annual Average | 78.7°F |
| 46% above US avg | |
| January Average | 70°F (21°C) |
| July Average | 85°F (29°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 4 ft (1 m) |
| Area | 1.3 sq mi (3.2 km²) |
| Population Density | 11,648/sq mi |
| Coordinates | 25.6907°N, 80.1656°W |
| Timezone | America/New_York |
| County | Miami-Dade County County |
| Nearest Airport | Miami International (MIA) 11 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)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.2.
| Feb 22, 1992 | 27 km SW of Freeport, Bahamas | M3.2 | 148 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
20 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 5.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Milton | Category 3 | 121 mph | 291 km |
| 2022 | Ian | Category 5 | 161 mph | 221 km |
| 2022 | Nicole | Category 1 | 75 mph | 183 km |
| 2020 | Isaias | Category 1 | 81 mph | 249 km |
| 2019 | Dorian | Category 5 | 178 mph | 209 km |
| 2017 | Irma | Category 4 | 132 mph | 154 km |
| 2016 | Matthew | Category 4 | 138 mph | 157 km |
| 2005 | Wilma | Category 3 | 127 mph | 101 km |
| 2005 | Katrina | Category 2 | 98 mph | 27 km |
| 2005 | Rita | Category 2 | 109 mph | 222 km |
| 2004 | Charley | Category 4 | 150 mph | 227 km |
| 2004 | Jeanne | Category 3 | 121 mph | 168 km |
| 2004 | Frances | Category 2 | 109 mph | 163 km |
| 2001 | Michelle | Category 1 | 92 mph | 256 km |
| 1999 | Floyd | Category 4 | 132 mph | 291 km |
| 1999 | Irene | Category 1 | 81 mph | 63 km |
| 1998 | Georges | Category 2 | 104 mph | 211 km |
| 1995 | Erin | Category 1 | 86 mph | 178 km |
| 1992 | Andrew | Category 5 | 167 mph | 22 km |
| 1987 | Floyd | Category 1 | 75 mph | 74 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
386 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 309 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Oct 9, 2024 | EF3 | 98 km | 32.9 mi | 0 |
| Mar 1, 1980 | EF3 | 53 km | 7.8 mi | 1 |
| Feb 23, 1965 | EF3 | 46 km | 5.7 mi | 0 |
| Jun 17, 1959 | EF3 | 12 km | 12.7 mi | 0 |
| Apr 10, 1956 | EF3 | 35 km | 7.8 mi | 0 |
| Sep 27, 2022 | EF2 | 76 km | 7.0 mi | 0 |
| Oct 18, 2011 | EF2 | 51 km | 1.1 mi | 0 |
| Aug 13, 2004 | EF2 | 92 km | 42.0 mi | 0 |
| Mar 27, 2003 | EF2 | 10 km | 6.0 mi | 1 |
| Nov 4, 1998 | EF2 | 74 km | 12.0 mi | 0 |
| Feb 2, 1998 | EF2 | 17 km | 21.0 mi | 0 |
| Mar 17, 1983 | EF2 | 80 km | 52.5 mi | 0 |
| May 24, 1979 | EF2 | 46 km | 3.0 mi | 0 |
| Dec 20, 1973 | EF2 | 40 km | 7.6 mi | 0 |
| Mar 4, 1972 | EF2 | 48 km | 2.0 mi | 0 |
| Jun 22, 1971 | EF2 | 15 km | 2.0 mi | 0 |
| Jun 13, 1971 | EF2 | 57 km | 4.5 mi | 0 |
| Jul 22, 1970 | EF2 | 87 km | 0.1 mi | 0 |
| Feb 19, 1968 | EF2 | 26 km | 5.7 mi | 0 |
| Mar 14, 1965 | EF2 | 96 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: STATE FIRE (171,317 acres, 1999).
| Year | Name | Acres Burned | Distance |
| 1999 | STATE FIRE | 171,317 | 78 km |
| 1989 | UNNAMED | 90,127 | 73 km |
| 1989 | INGRAHAM | 85,437 | 65 km |
| 2011 | PRAIRIE FIRE | 67,959 | 44 km |
| 2018 | BUZZARD | 61,663 | 93 km |
| 2007 | BICY COMPLEX | 60,644 | 98 km |
| 1989 | UNNAMED | 56,910 | 84 km |
| 1985 | UNNAMED | 54,638 | 40 km |
| 1985 | UNNAMED | 54,003 | 70 km |
| 1985 | ALLEY | 51,504 | 84 km |
| 2014 | ALLIGATOR | 50,667 | 75 km |
| 1989 | UNNAMED | 49,716 | 100 km |
| 2008 | MUSTANG CORNER | 38,600 | 49 km |
| 2007 | MFC SOUTH FIRE | 37,301 | 44 km |
| 1985 | UNNAMED | 35,018 | 79 km |
| 2007 | UNNAMED | 32,578 | 71 km |
| 2021 | BOBCAT | 28,849 | 96 km |
| 2020 | MOONFISH | 25,819 | 75 km |
| 2001 | UNNAMED | 22,780 | 42 km |
| 1989 | UNNAMED | 19,103 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 70°F (21°C) | 2.2 in | |
| February | 68°F (20°C) | 2.2 in | Coldest |
| March | 71°F (22°C) | 2.4 in | |
| April | 74°F (23°C) | 3.0 in | |
| May | 78°F (25°C) | 6.0 in | |
| June | 81°F (27°C) | 9.3 in | Wettest |
| July | 85°F (29°C) | 6.2 in | Warmest |
| August | 83°F (28°C) | 7.6 in | |
| September | 82°F (28°C) | 8.2 in | |
| October | 79°F (26°C) | 6.2 in | |
| November | 74°F (23°C) | 3.2 in | |
| December | 70°F (21°C) | 1.7 in | Driest |
Key Biscayne has a seasonal temperature swing of 17°F / from 68°F in February to 85°F in July. Total annual precipitation is 58.2 inches, with June being the wettest month (9.3") and December the driest (1.7").