Key Biscayne Weather in December
Average highs run from 81°F on December 1 to 78°F on December 31, and lows from 68°F to 64°F. Normal precipitation for the month is 2.24 in over about 8 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 80°F
- Average low
- 66°F
- Precipitation
- 2.24 in
- Record high
- 89°FDec 3, 2023
- Record low
- 30°FDec 25, 1989
- Chance of a freeze
- 0%
- Daylight
- 10 h 39 min to 10 h 34 min
- Cloud cover
- 53%
- Humidity
- 77%
- Dew point
- 66°F
- Wind
- 13.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 81°F | 68°F | 85°F 1978 | 44°F 1966 | 29% |
| Dec 2 | 81°F | 68°F | 86°F 1981 | 46°F 1956 | 29% |
| Dec 3 | 81°F | 68°F | 89°F 2023 | 49°F 1969 | 29% |
| Dec 4 | 81°F | 68°F | 86°F 2023 | 47°F 1989 | 29% |
| Dec 5 | 81°F | 68°F | 87°F 1978 | 45°F 1957 | 29% |
| Dec 6 | 81°F | 68°F | 87°F 2016 | 46°F 1968 | 29% |
| Dec 7 | 81°F | 67°F | 86°F 1978 | 44°F 2010 | 29% |
| Dec 8 | 81°F | 67°F | 87°F 2017 | 44°F 2010 | 28% |
| Dec 9 | 80°F | 67°F | 87°F 2009 | 49°F 1968 | 28% |
| Dec 10 | 80°F | 67°F | 89°F 2009 | 43°F 1962 | 28% |
| Dec 11 | 80°F | 67°F | 86°F 2024 | 36°F 1962 | 28% |
| Dec 12 | 80°F | 67°F | 87°F 1986 | 35°F 1957 | 27% |
| Dec 13 | 80°F | 67°F | 86°F 2002 | 35°F 1962 | 27% |
| Dec 14 | 80°F | 66°F | 87°F 2016 | 35°F 1962 | 27% |
| Dec 15 | 80°F | 66°F | 86°F 2013 | 38°F 2010 | 26% |
| Dec 16 | 80°F | 66°F | 85°F 2009 | 34°F 1968 | 26% |
| Dec 17 | 80°F | 66°F | 85°F 1965 | 44°F 1953 | 26% |
| Dec 18 | 80°F | 66°F | 87°F 1989 | 41°F 1973 | 26% |
| Dec 19 | 79°F | 66°F | 87°F 2016 | 39°F 1981 | 26% |
| Dec 20 | 79°F | 65°F | 86°F 1961 | 36°F 1981 | 25% |
| Dec 21 | 79°F | 65°F | 85°F 1948 | 41°F 1954 | 25% |
| Dec 22 | 79°F | 65°F | 86°F 1948 | 39°F 1960 | 25% |
| Dec 23 | 79°F | 65°F | 85°F 1968 | 37°F 1989 | 25% |
| Dec 24 | 79°F | 65°F | 86°F 1990 | 31°F 1989 | 25% |
| Dec 25 | 79°F | 65°F | 85°F 2016 | 30°F 1989 | 24% |
| Dec 26 | 79°F | 64°F | 84°F 2012 | 33°F 1983 | 24% |
| Dec 27 | 79°F | 64°F | 84°F 1997 | 41°F 1985 | 24% |
| Dec 28 | 79°F | 64°F | 84°F 2015 | 39°F 2010 | 24% |
| Dec 29 | 78°F | 64°F | 85°F 1981 | 41°F 1961 | 24% |
| Dec 30 | 78°F | 64°F | 84°F 2015 | 39°F 1961 | 24% |
| Dec 31 | 78°F | 64°F | 84°F 1982 | 42°F 2000 | 24% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 6:50 AM, sunset 5:29 PM
- December 31
- sunrise 7:07 AM, sunset 5:41 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00081306 (Cape Florida), public domain. Records: NOAA GHCN-Daily, station USW00012839, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.