August weather in Glen St. Mary, FL
The average temperature in Glen St. Mary in August is 81.6°F (71.4°F–91.8°F). Average precipitation: 7.12 inches.
August is a summer month in Glen St. Mary, and is warmer than the annual average of 68.8°F. Daily temperatures swing about 20.4°F between overnight low and afternoon high. Expect about 15 days with precipitation. Daylight averages about 13h 6m. For travel, August is a wet month.
Avg High
91.8°F
Avg Low
71.4°F
Precipitation
7.12 in
Daylight
13h 6m
August records in Glen St. Mary
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (1999) | 63.0°F (1966) | 3.40 in (2016) |
| August 2 | 99.0°F (1999) | 64.9°F (1966) | 3.10 in (1998) |
| August 3 | 98.1°F (1931) | 64.9°F (2014) | 2.65 in (2025) |
| August 4 | 97.0°F (1935) | 66.0°F (1930) | 2.25 in (1920) |
| August 5 | 98.1°F (1931) | 63.0°F (1998) | 5.60 in (1921) |
| August 6 | 99.0°F (1927) | 59.0°F (2020) | 4.00 in (1938) |
| August 7 | 100.0°F (1956) | 59.0°F (1950) | 2.75 in (1999) |
| August 8 | 97.0°F (1924) | 60.1°F (2020) | 2.72 in (1948) |
| August 9 | 99.0°F (1987) | 57.9°F (2002) | 4.65 in (1945) |
| August 10 | 97.0°F (1941) | 54.0°F (2020) | 2.20 in (1924) |
| August 11 | 98.1°F (1987) | 60.1°F (2020) | 1.90 in (1948) |
| August 12 | 99.0°F (1938) | 54.0°F (2020) | 2.35 in (1981) |
| August 13 | 97.0°F (1938) | 61.0°F (1962) | 2.10 in (1975) |
| August 14 | 99.0°F (1938) | 64.0°F (1962) | 2.70 in (1963) |
| August 15 | 96.1°F (1938) | 61.0°F (1972) | 2.29 in (2008) |
| August 16 | 96.1°F (1929) | 53.1°F (2020) | 1.80 in (1922) |
| August 17 | 97.0°F (1977) | 57.9°F (2020) | 2.90 in (1971) |
| August 18 | 98.1°F (1952) | 53.1°F (1996) | 2.45 in (2004) |
| August 19 | 98.1°F (1921) | 54.0°F (1996) | 2.92 in (2008) |
| August 20 | 98.1°F (1925) | 60.1°F (2020) | 2.05 in (1961) |
| August 21 | 98.1°F (1972) | 60.1°F (1987) | 4.12 in (1953) |
| August 22 | 98.1°F (1980) | 60.1°F (1930) | 4.50 in (2008) |
| August 23 | 99.0°F (1980) | 57.0°F (1930) | 3.44 in (1927) |
| August 24 | 98.1°F (2014) | 57.0°F (1930) | 2.20 in (1991) |
| August 25 | 99.0°F (1938) | 55.9°F (1930) | 2.40 in (1944) |
| August 26 | 98.1°F (1938) | 57.9°F (1921) | 3.00 in (1984) |
| August 27 | 98.1°F (1938) | 57.0°F (1930) | 2.22 in (2009) |
| August 28 | 97.0°F (1936) | 52.0°F (2020) | 4.00 in (1922) |
| August 29 | 97.0°F (1951) | 57.0°F (1988) | 1.50 in (1947) |
| August 30 | 96.1°F (2006) | 57.0°F (1988) | 1.50 in (2004) |
| August 31 | 96.1°F (1940) | 57.9°F (1930) | 2.25 in (1996) |