July weather in Herndon, VA
The average temperature in Herndon in July is 77.2°F (66.8°F–87.6°F). Average precipitation: 4.15 inches.
July is a summer month in Herndon, and is warmer than the annual average of 55.7°F. Daily temperatures swing about 20.8°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 29m. For travel, July is a comfortable month to visit.
Avg High
87.6°F
Avg Low
66.8°F
Precipitation
4.15 in
Daylight
14h 29m
July records in Herndon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 96.1°F (2012) | 41.0°F (1988) | 0.76 in (1984) |
| July 2 | 98.1°F (1966) | 44.1°F (1988) | 2.36 in (1968) |
| July 3 | 102.9°F (1966) | 50.0°F (1962) | 1.66 in (1978) |
| July 4 | 97.0°F (1999) | 48.0°F (1986) | 1.87 in (2001) |
| July 5 | 99.0°F (1990) | 50.0°F (1971) | 1.43 in (2005) |
| July 6 | 102.0°F (1977) | 45.0°F (1979) | 1.68 in (2017) |
| July 7 | 100.9°F (1988) | 46.9°F (1970) | 1.59 in (2005) |
| July 8 | 100.9°F (2012) | 48.0°F (1983) | 1.96 in (2005) |
| July 9 | 99.0°F (1988) | 48.0°F (1984) | 2.23 in (1970) |
| July 10 | 99.0°F (1988) | 53.1°F (1963) | 1.63 in (1995) |
| July 11 | 98.1°F (1988) | 52.0°F (1983) | 3.71 in (2013) |
| July 12 | 97.0°F (1986) | 46.9°F (2002) | 2.61 in (1990) |
| July 13 | 97.0°F (1966) | 52.0°F (1978) | 1.30 in (1975) |
| July 14 | 98.1°F (1993) | 53.1°F (2009) | 1.56 in (2002) |
| July 15 | 99.0°F (2024) | 53.1°F (1981) | 1.01 in (2005) |
| July 16 | 104.0°F (1988) | 57.0°F (1966) | 1.65 in (1989) |
| July 17 | 100.0°F (1988) | 44.1°F (1962) | 1.11 in (2018) |
| July 18 | 100.9°F (2012) | 51.1°F (1985) | 1.66 in (2017) |
| July 19 | 98.1°F (1977) | 53.1°F (1976) | 1.52 in (1968) |
| July 20 | 100.9°F (1980) | 55.0°F (1974) | 2.28 in (1970) |
| July 21 | 100.9°F (1991) | 48.0°F (1966) | 5.02 in (2018) |
| July 22 | 105.1°F (2011) | 50.0°F (1974) | 2.25 in (1969) |
| July 23 | 99.0°F (1991) | 50.0°F (1977) | 1.51 in (1988) |
| July 24 | 99.0°F (2010) | 48.0°F (1985) | 0.86 in (2020) |
| July 25 | 100.0°F (2016) | 55.0°F (1976) | 1.54 in (1992) |
| July 26 | 98.1°F (1966) | 50.0°F (1976) | 0.76 in (1989) |
| July 27 | 98.1°F (1993) | 52.0°F (1977) | 3.50 in (1994) |
| July 28 | 99.0°F (1993) | 46.9°F (1977) | 1.65 in (2000) |
| July 29 | 102.9°F (2011) | 52.0°F (2014) | 0.92 in (2001) |
| July 30 | 98.1°F (1988) | 48.0°F (2014) | 1.29 in (2018) |
| July 31 | 98.1°F (1999) | 50.0°F (1997) | 1.87 in (1978) |