Key Biscayne Weather in August
Average highs run from 91°F on August 1 to 91°F on August 31, and lows from 79°F to 79°F. Normal precipitation for the month is 7.05 in over about 16 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 91°F
- Average low
- 79°F
- Precipitation
- 7.05 in
- Record high
- 100°FAug 18, 2026
- Record low
- 68°FAug 8, 1950
- Chance of a freeze
- 0%
- Days of 90°F or more
- 18.2
- Daylight
- 13 h 19 min to 12 h 40 min
- Cloud cover
- 57%
- Humidity
- 76%
- Dew point
- 76°F
- Wind
- 8.9 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 |
|---|---|---|---|---|---|
| Aug 1 | 91°F | 79°F | 98°F 1990 | 72°F 1966 | 49% |
| Aug 2 | 91°F | 79°F | 96°F 1982 | 71°F 1957 | 49% |
| Aug 3 | 91°F | 79°F | 96°F 1954 | 69°F 1985 | 49% |
| Aug 4 | 91°F | 79°F | 95°F 1954 | 71°F 1959 | 49% |
| Aug 5 | 91°F | 79°F | 97°F 2007 | 70°F 1959 | 49% |
| Aug 6 | 91°F | 79°F | 98°F 1954 | 72°F 1957 | 49% |
| Aug 7 | 91°F | 79°F | 97°F 1956 | 72°F 2002 | 49% |
| Aug 8 | 91°F | 79°F | 95°F 1956 | 68°F 1950 | 49% |
| Aug 9 | 91°F | 79°F | 98°F 1987 | 70°F 1967 | 49% |
| Aug 10 | 92°F | 79°F | 96°F 1955 | 71°F 1950 | 49% |
| Aug 11 | 92°F | 79°F | 96°F 1984 | 70°F 1984 | 49% |
| Aug 12 | 92°F | 79°F | 94°F 1955 | 72°F 1994 | 49% |
| Aug 13 | 92°F | 80°F | 96°F 2006 | 71°F 1983 | 49% |
| Aug 14 | 92°F | 80°F | 96°F 2026 | 70°F 1998 | 49% |
| Aug 15 | 92°F | 80°F | 98°F 2024 | 71°F 1959 | 49% |
| Aug 16 | 92°F | 80°F | 97°F 1989 | 72°F 1959 | 49% |
| Aug 17 | 92°F | 80°F | 96°F 2022 | 71°F 1961 | 50% |
| Aug 18 | 92°F | 80°F | 100°F 2026 | 71°F 1956 | 50% |
| Aug 19 | 92°F | 80°F | 96°F 2026 | 71°F 1984 | 50% |
| Aug 20 | 92°F | 80°F | 97°F 1983 | 72°F 2006 | 50% |
| Aug 21 | 92°F | 80°F | 97°F 1993 | 71°F 1957 | 50% |
| Aug 22 | 92°F | 80°F | 96°F 1993 | 71°F 1973 | 51% |
| Aug 23 | 91°F | 80°F | 96°F 1958 | 72°F 1966 | 51% |
| Aug 24 | 91°F | 80°F | 95°F 2010 | 71°F 1957 | 51% |
| Aug 25 | 91°F | 80°F | 94°F 1958 | 73°F 1980 | 51% |
| Aug 26 | 91°F | 80°F | 94°F 1954 | 73°F 1948 | 51% |
| Aug 27 | 91°F | 79°F | 97°F 1954 | 72°F 1948 | 52% |
| Aug 28 | 91°F | 79°F | 96°F 1954 | 71°F 1994 | 52% |
| Aug 29 | 91°F | 79°F | 95°F 1952 | 72°F 1965 | 52% |
| Aug 30 | 91°F | 79°F | 95°F 1951 | 73°F 1953 | 52% |
| Aug 31 | 91°F | 79°F | 96°F 2023 | 72°F 1956 | 52% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:47 AM, sunset 8:06 PM
- August 31
- sunrise 7:01 AM, sunset 7:41 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.