May weather in Herndon, VA
The average temperature in Herndon in May is 64.0°F (53.0°F–75.0°F). Average precipitation: 4.72 inches.
May is a spring month in Herndon, and is warmer than the annual average of 55.7°F. Daily temperatures swing about 22°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 8m. For travel, May is a comfortable month to visit.
Avg High
75.0°F
Avg Low
53.0°F
Precipitation
4.72 in
Daylight
14h 8m
May records in Herndon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 90.0°F (2010) | 33.1°F (1996) | 1.42 in (1981) |
| May 2 | 91.0°F (2024) | 34.0°F (1960) | 1.39 in (2016) |
| May 3 | 91.9°F (1965) | 32.0°F (1963) | 1.03 in (1984) |
| May 4 | 90.0°F (2001) | 30.9°F (1967) | 1.23 in (1996) |
| May 5 | 88.0°F (1980) | 28.9°F (1976) | 2.34 in (1989) |
| May 6 | 90.0°F (1986) | 36.0°F (1968) | 1.18 in (2022) |
| May 7 | 90.0°F (1986) | 28.0°F (1970) | 1.51 in (1967) |
| May 8 | 90.0°F (2000) | 28.9°F (1974) | 2.10 in (1960) |
| May 9 | 91.0°F (1963) | 30.0°F (1976) | 0.93 in (1974) |
| May 10 | 90.0°F (1963) | 30.9°F (1966) | 1.61 in (1990) |
| May 11 | 90.0°F (1993) | 28.9°F (1966) | 3.73 in (2008) |
| May 12 | 90.0°F (2018) | 34.0°F (1969) | 1.37 in (1974) |
| May 13 | 91.9°F (2000) | 32.0°F (1976) | 1.93 in (1971) |
| May 14 | 89.1°F (2010) | 32.0°F (1996) | 1.87 in (2018) |
| May 15 | 90.0°F (1962) | 37.0°F (1984) | 2.40 in (2003) |
| May 16 | 90.0°F (1998) | 35.1°F (2000) | 1.97 in (2014) |
| May 17 | 93.0°F (1960) | 30.0°F (1984) | 1.22 in (1970) |
| May 18 | 91.0°F (1987) | 33.1°F (1973) | 3.13 in (1988) |
| May 19 | 91.9°F (1996) | 36.0°F (2002) | 1.18 in (1988) |
| May 20 | 93.0°F (1996) | 36.0°F (2002) | 1.86 in (2005) |
| May 21 | 91.9°F (1996) | 33.1°F (1992) | 1.06 in (2003) |
| May 22 | 91.0°F (2022) | 30.9°F (2002) | 2.07 in (2001) |
| May 23 | 91.9°F (1964) | 39.0°F (1971) | 2.40 in (2010) |
| May 24 | 90.0°F (1964) | 36.0°F (1963) | 0.83 in (1994) |
| May 25 | 91.9°F (1991) | 36.0°F (1967) | 1.76 in (1997) |
| May 26 | 91.9°F (2007) | 37.9°F (1967) | 3.59 in (2009) |
| May 27 | 91.9°F (1965) | 37.0°F (1972) | 1.45 in (1968) |
| May 28 | 90.0°F (1991) | 37.0°F (1994) | 2.16 in (1982) |
| May 29 | 97.0°F (1969) | 39.9°F (1997) | 1.00 in (1984) |
| May 30 | 95.0°F (1987) | 37.9°F (1996) | 2.65 in (1960) |
| May 31 | 93.9°F (1991) | 37.0°F (1984) | 2.35 in (2018) |