May weather in New Castle, DE
The average temperature in New Castle in May is 63.5°F (53.4°F–73.5°F). Average precipitation: 3.57 inches.
May is a spring month in New Castle, and is warmer than the annual average of 55.5°F. Daily temperatures swing about 20.1°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 11m. For travel, May is one of the best months of the year to visit.
Avg High
73.5°F
Avg Low
53.4°F
Precipitation
3.57 in
Daylight
14h 11m
May records in New Castle
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 90.0°F (1942) | 30.0°F (1978) | 2.29 in (1976) |
| May 2 | 88.0°F (2018) | 35.1°F (1960) | 1.68 in (1989) |
| May 3 | 90.0°F (2018) | 33.1°F (2005) | 1.08 in (1985) |
| May 4 | 88.0°F (1965) | 34.0°F (1931) | 0.92 in (1975) |
| May 5 | 88.0°F (1955) | 35.1°F (1931) | 1.65 in (2017) |
| May 6 | 89.1°F (1949) | 39.9°F (1954) | 1.90 in (1991) |
| May 7 | 91.0°F (2000) | 33.1°F (1970) | 1.58 in (1967) |
| May 8 | 90.0°F (2000) | 34.0°F (1997) | 2.15 in (1992) |
| May 9 | 91.9°F (1963) | 33.1°F (2020) | 1.94 in (2008) |
| May 10 | 91.0°F (1970) | 33.1°F (1966) | 1.51 in (1990) |
| May 11 | 90.0°F (1948) | 32.0°F (1966) | 2.00 in (1981) |
| May 12 | 90.0°F (1959) | 37.0°F (1962) | 0.96 in (2019) |
| May 13 | 89.1°F (1991) | 37.0°F (1967) | 1.81 in (1948) |
| May 14 | 93.0°F (1956) | 36.0°F (1996) | 1.87 in (1978) |
| May 15 | 88.0°F (1962) | 39.0°F (1984) | 1.34 in (1981) |
| May 16 | 89.1°F (1951) | 37.9°F (1959) | 2.06 in (1983) |
| May 17 | 91.9°F (1974) | 35.1°F (1956) | 2.39 in (1985) |
| May 18 | 93.9°F (1962) | 39.9°F (1967) | 1.39 in (2002) |
| May 19 | 95.0°F (1962) | 37.0°F (2009) | 1.20 in (1966) |
| May 20 | 96.1°F (1996) | 37.0°F (2002) | 1.87 in (1969) |
| May 21 | 95.0°F (1996) | 35.1°F (2002) | 1.63 in (2016) |
| May 22 | 91.9°F (2021) | 37.0°F (2002) | 1.50 in (2001) |
| May 23 | 93.9°F (2021) | 39.0°F (1932) | 1.28 in (1951) |
| May 24 | 90.0°F (1955) | 36.0°F (1963) | 2.23 in (1999) |
| May 25 | 91.9°F (1991) | 39.0°F (1956) | 2.01 in (1952) |
| May 26 | 91.9°F (2010) | 43.0°F (1956) | 2.34 in (2001) |
| May 27 | 93.0°F (1965) | 42.1°F (1972) | 0.61 in (1973) |
| May 28 | 91.0°F (1991) | 41.0°F (1997) | 2.14 in (1982) |
| May 29 | 93.0°F (1955) | 42.1°F (1949) | 2.72 in (1990) |
| May 30 | 95.0°F (2011) | 41.0°F (1961) | 1.21 in (2025) |
| May 31 | 96.1°F (2011) | 42.1°F (1961) | 2.58 in (1993) |