August weather in Fairfax, VA
The average temperature in Fairfax in August is 73.6°F (64.9°F–82.4°F). Average precipitation: 3.54 inches.
August is a summer month in Fairfax, and is warmer than the annual average of 54°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 31m. For travel, August is a comfortable month to visit.
Avg High
82.4°F
Avg Low
64.9°F
Precipitation
3.54 in
Daylight
13h 31m
August records in Fairfax
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 93.0°F (1999) | 57.9°F (1997) | 2.63 in (1948) |
| August 2 | 95.0°F (2011) | 55.9°F (1998) | 5.20 in (1944) |
| August 3 | 93.9°F (2015) | 55.9°F (1998) | 1.52 in (1969) |
| August 4 | 95.0°F (2015) | 57.0°F (1998) | 2.12 in (2020) |
| August 5 | 91.9°F (2014) | 53.1°F (2013) | 1.52 in (1967) |
| August 6 | 91.0°F (2002) | 53.1°F (2013) | 3.71 in (1993) |
| August 7 | 90.0°F (2018) | 53.1°F (2004) | 1.49 in (1955) |
| August 8 | 91.9°F (2011) | 54.0°F (2004) | 2.07 in (1942) |
| August 9 | 95.0°F (2007) | 55.0°F (2004) | 1.82 in (1974) |
| August 10 | 91.9°F (2001) | 55.9°F (1999) | 2.61 in (1990) |
| August 11 | 93.0°F (2001) | 57.0°F (2008) | 4.40 in (2001) |
| August 12 | 93.9°F (2016) | 57.0°F (2006) | 4.00 in (1928) |
| August 13 | 95.0°F (2016) | 55.0°F (2006) | 3.47 in (1955) |
| August 14 | 97.0°F (2016) | 54.0°F (2013) | 1.21 in (1994) |
| August 15 | 96.1°F (2016) | 50.0°F (2013) | 1.45 in (1974) |
| August 16 | 93.0°F (2016) | 50.0°F (2013) | 1.08 in (2016) |
| August 17 | 97.0°F (2015) | 51.1°F (2013) | 1.62 in (1926) |
| August 18 | 100.0°F (2015) | 53.1°F (2013) | 2.78 in (1955) |
| August 19 | 93.9°F (2019) | 57.0°F (2013) | 1.38 in (1948) |
| August 20 | 91.9°F (2019) | 51.1°F (1998) | 3.50 in (1950) |
| August 21 | 91.0°F (2019) | 51.1°F (2024) | 3.25 in (1973) |
| August 22 | 91.9°F (2014) | 51.1°F (2024) | 1.63 in (2009) |
| August 23 | 90.0°F (2015) | 52.0°F (2024) | 1.67 in (1955) |
| August 24 | 91.0°F (1998) | 53.1°F (2024) | 1.75 in (1967) |
| August 25 | 91.9°F (2015) | 55.9°F (2013) | 4.15 in (1967) |
| August 26 | 93.0°F (2016) | 52.0°F (2018) | 3.71 in (1961) |
| August 27 | 91.9°F (2016) | 54.0°F (2025) | 3.21 in (1971) |
| August 28 | 93.0°F (2014) | 54.0°F (2025) | 2.54 in (1947) |
| August 29 | 93.9°F (2018) | 54.0°F (2025) | 1.81 in (2002) |
| August 30 | 93.0°F (2018) | 51.1°F (2025) | 1.95 in (2024) |
| August 31 | 95.0°F (2014) | 50.0°F (2025) | 2.92 in (1975) |