Nassau County Weather in August
Average highs run from 92°F on August 1 to 89°F on August 31, and lows from 74°F to 73°F. Normal precipitation for the month is 6.88 in over about 15 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
- 73°F
- Precipitation
- 6.88 in
- Record high
- 102°FAug 1, 1999
- Record low
- 63°FAug 9, 2002
- Chance of a freeze
- 0%
- Days of 90°F or more
- 20.3
- Daylight
- 13 h 36 min to 12 h 48 min
- Cloud cover
- 59%
- Humidity
- 81%
- Dew point
- 74°F
- Wind
- 4.0 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 |
|---|---|---|---|---|---|
| Aug 1 | 92°F | 74°F | 102°F 1999 | 68°F 1966 | 48% |
| Aug 2 | 92°F | 74°F | 101°F 1999 | 68°F 1997 | 48% |
| Aug 3 | 92°F | 74°F | 99°F 1941 | 69°F 1939 | 48% |
| Aug 4 | 92°F | 74°F | 99°F 1941 | 68°F 2001 | 48% |
| Aug 5 | 92°F | 74°F | 102°F 1954 | 69°F 1989 | 48% |
| Aug 6 | 92°F | 74°F | 100°F 1941 | 67°F 1969 | 48% |
| Aug 7 | 92°F | 74°F | 100°F 1956 | 64°F 1950 | 48% |
| Aug 8 | 92°F | 74°F | 100°F 1941 | 64°F 2002 | 48% |
| Aug 9 | 91°F | 74°F | 101°F 1941 | 63°F 2002 | 48% |
| Aug 10 | 91°F | 74°F | 100°F 1941 | 67°F 1938 | 48% |
| Aug 11 | 91°F | 74°F | 100°F 1938 | 68°F 1989 | 48% |
| Aug 12 | 91°F | 74°F | 102°F 1938 | 65°F 1989 | 48% |
| Aug 13 | 91°F | 74°F | 101°F 1938 | 67°F 1962 | 48% |
| Aug 14 | 91°F | 74°F | 100°F 1938 | 68°F 1962 | 48% |
| Aug 15 | 91°F | 74°F | 99°F 1956 | 64°F 2022 | 48% |
| Aug 16 | 91°F | 74°F | 98°F 1954 | 67°F 1954 | 48% |
| Aug 17 | 91°F | 74°F | 102°F 1954 | 67°F 1993 | 48% |
| Aug 18 | 91°F | 74°F | 99°F 1938 | 68°F 1945 | 48% |
| Aug 19 | 91°F | 73°F | 98°F 1938 | 68°F 1960 | 48% |
| Aug 20 | 91°F | 73°F | 99°F 1980 | 68°F 1960 | 48% |
| Aug 21 | 90°F | 73°F | 97°F 1939 | 66°F 1961 | 48% |
| Aug 22 | 90°F | 73°F | 99°F 2014 | 66°F 1973 | 48% |
| Aug 23 | 90°F | 73°F | 98°F 1966 | 66°F 1973 | 48% |
| Aug 24 | 90°F | 73°F | 100°F 1938 | 66°F 2001 | 48% |
| Aug 25 | 90°F | 73°F | 102°F 1938 | 64°F 1943 | 47% |
| Aug 26 | 90°F | 73°F | 102°F 1938 | 64°F 1997 | 47% |
| Aug 27 | 90°F | 73°F | 102°F 1938 | 64°F 1984 | 47% |
| Aug 28 | 90°F | 73°F | 100°F 1938 | 64°F 2014 | 47% |
| Aug 29 | 90°F | 73°F | 99°F 1990 | 63°F 1984 | 47% |
| Aug 30 | 90°F | 73°F | 98°F 1948 | 66°F 1976 | 47% |
| Aug 31 | 89°F | 73°F | 99°F 1954 | 64°F 1999 | 46% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:45 AM, sunset 8:21 PM
- August 31
- sunrise 7:03 AM, sunset 7:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00013889 (Jacksonville), public domain. Records: NOAA GHCN-Daily, station USW00013889, 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.