May weather in Portsmouth, OH
The average temperature in Portsmouth in May is 64.1°F (52.4°F–75.8°F). Average precipitation: 4.60 inches.
May is a spring month in Portsmouth, and is warmer than the annual average of 54.9°F. Daily temperatures swing about 23.4°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 7m. For travel, May is a comfortable month to visit.
Avg High
75.8°F
Avg Low
52.4°F
Precipitation
4.60 in
Daylight
14h 7m
May records in Portsmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1942) | 30.0°F (1918) | 0.98 in (1983) |
| May 2 | 91.9°F (1895) | 30.9°F (1929) | 2.10 in (2010) |
| May 3 | 93.0°F (1895) | 30.0°F (1986) | 3.10 in (2010) |
| May 4 | 93.9°F (1949) | 28.0°F (1986) | 1.24 in (2020) |
| May 5 | 95.0°F (1895) | 30.9°F (1911) | 1.85 in (1914) |
| May 6 | 93.0°F (1949) | 33.1°F (1968) | 1.33 in (1971) |
| May 7 | 93.0°F (1940) | 33.1°F (1974) | 2.04 in (1967) |
| May 8 | 93.9°F (1936) | 32.0°F (1989) | 2.18 in (1994) |
| May 9 | 97.0°F (1896) | 30.0°F (2020) | 1.24 in (1992) |
| May 10 | 98.1°F (1896) | 28.9°F (1966) | 0.99 in (1909) |
| May 11 | 97.0°F (1896) | 32.0°F (1913) | 2.46 in (1905) |
| May 12 | 93.0°F (1894) | 30.9°F (1938) | 1.07 in (1893) |
| May 13 | 93.0°F (1894) | 33.1°F (1996) | 2.73 in (1922) |
| May 14 | 98.1°F (1894) | 33.1°F (1996) | 2.00 in (1933) |
| May 15 | 93.9°F (1900) | 32.0°F (1910) | 1.68 in (1985) |
| May 16 | 97.0°F (1894) | 32.0°F (2016) | 2.12 in (1996) |
| May 17 | 93.9°F (1962) | 32.0°F (1895) | 2.53 in (1944) |
| May 18 | 95.0°F (1962) | 36.0°F (1973) | 1.64 in (1899) |
| May 19 | 95.0°F (1962) | 35.1°F (2002) | 1.95 in (2001) |
| May 20 | 95.0°F (1934) | 32.0°F (1932) | 1.92 in (2020) |
| May 21 | 95.0°F (1927) | 28.9°F (1932) | 2.29 in (1933) |
| May 22 | 97.0°F (1941) | 30.9°F (2002) | 2.25 in (1949) |
| May 23 | 93.0°F (1921) | 37.0°F (1963) | 1.74 in (1955) |
| May 24 | 98.1°F (1927) | 37.9°F (1931) | 1.53 in (1968) |
| May 25 | 95.0°F (1914) | 33.1°F (1928) | 1.57 in (1996) |
| May 26 | 96.1°F (1911) | 32.0°F (2013) | 1.30 in (1939) |
| May 27 | 95.0°F (1911) | 34.0°F (1961) | 2.18 in (1917) |
| May 28 | 96.1°F (1914) | 36.0°F (1907) | 1.70 in (1982) |
| May 29 | 99.0°F (1914) | 41.0°F (1894) | 1.32 in (1905) |
| May 30 | 98.1°F (1895) | 37.9°F (1930) | 2.00 in (1982) |
| May 31 | 98.1°F (1895) | 39.9°F (1930) | 1.66 in (2025) |