Key West Weather in August
Average highs run from 90°F on August 1 to 89°F on August 31, and lows from 78°F to 78°F. Normal precipitation for the month is 6.13 in over about 14 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
- 90°F
- Average low
- 79°F
- Precipitation
- 6.13 in
- Record high
- 96°FAug 15, 2024
- Record low
- 68°FAug 11, 1952
- Chance of a freeze
- 0%
- Days of 90°F or more
- 19.2
- Daylight
- 13 h 15 min to 12 h 38 min
- Cloud cover
- 57%
- Humidity
- 75%
- Dew point
- 76°F
- Wind
- 9.6 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 | 90°F | 78°F | 94°F 2023 | 71°F 1971 | 39% |
| Aug 2 | 90°F | 78°F | 95°F 2023 | 73°F 1999 | 39% |
| Aug 3 | 90°F | 78°F | 95°F 1957 | 73°F 2015 | 40% |
| Aug 4 | 90°F | 78°F | 94°F 2023 | 74°F 1952 | 40% |
| Aug 5 | 90°F | 78°F | 94°F 2023 | 71°F 1985 | 40% |
| Aug 6 | 90°F | 78°F | 94°F 1990 | 71°F 1986 | 40% |
| Aug 7 | 90°F | 78°F | 94°F 2007 | 69°F 1949 | 40% |
| Aug 8 | 90°F | 78°F | 93°F 1951 | 69°F 1950 | 41% |
| Aug 9 | 90°F | 79°F | 93°F 1951 | 73°F 1971 | 41% |
| Aug 10 | 90°F | 79°F | 94°F 1952 | 69°F 1952 | 41% |
| Aug 11 | 90°F | 79°F | 95°F 2023 | 68°F 1952 | 42% |
| Aug 12 | 90°F | 79°F | 93°F 1991 | 73°F 1986 | 42% |
| Aug 13 | 90°F | 79°F | 94°F 2024 | 71°F 1962 | 42% |
| Aug 14 | 90°F | 79°F | 93°F 1963 | 71°F 1958 | 43% |
| Aug 15 | 90°F | 79°F | 96°F 2024 | 74°F 1973 | 44% |
| Aug 16 | 90°F | 79°F | 93°F 1963 | 74°F 1952 | 44% |
| Aug 17 | 90°F | 79°F | 93°F 1978 | 74°F 1996 | 45% |
| Aug 18 | 90°F | 79°F | 94°F 2025 | 73°F 1990 | 46% |
| Aug 19 | 90°F | 79°F | 94°F 2017 | 73°F 1986 | 47% |
| Aug 20 | 90°F | 79°F | 94°F 1958 | 69°F 1963 | 47% |
| Aug 21 | 90°F | 79°F | 95°F 1950 | 74°F 1961 | 48% |
| Aug 22 | 90°F | 79°F | 95°F 2024 | 73°F 1957 | 49% |
| Aug 23 | 90°F | 79°F | 93°F 1949 | 71°F 1957 | 49% |
| Aug 24 | 90°F | 79°F | 94°F 2015 | 72°F 1959 | 50% |
| Aug 25 | 90°F | 79°F | 93°F 1952 | 72°F 2012 | 51% |
| Aug 26 | 90°F | 79°F | 93°F 2023 | 71°F 1948 | 51% |
| Aug 27 | 90°F | 79°F | 94°F 2019 | 72°F 1948 | 51% |
| Aug 28 | 90°F | 78°F | 93°F 2009 | 73°F 1948 | 52% |
| Aug 29 | 90°F | 78°F | 94°F 1952 | 72°F 1994 | 52% |
| Aug 30 | 89°F | 78°F | 93°F 1951 | 70°F 1960 | 53% |
| Aug 31 | 89°F | 78°F | 93°F 1948 | 73°F 1960 | 53% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:56 AM, sunset 8:11 PM
- August 31
- sunrise 7:08 AM, sunset 7:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00084571 (Key W WFO), public domain. Records: NOAA GHCN-Daily, station USW00012836, 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.