May weather in Watertown, SD
The average temperature in Watertown in May is 55.7°F (44.5°F–66.9°F). Average precipitation: 2.87 inches.
May is a spring month in Watertown, and is warmer than the annual average of 43°F. Daily temperatures swing about 22.4°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 39m. For travel, May is a comfortable month to visit.
Avg High
66.9°F
Avg Low
44.5°F
Precipitation
2.87 in
Snow
0.1 in
May records in Watertown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 95.0°F (1959) | 18.0°F (1961) | 1.77 in (1972) |
| May 2 | 89.1°F (1955) | 17.1°F (1911) | 0.85 in (1941) |
| May 3 | 91.9°F (1949) | 16.0°F (1907) | 2.22 in (1969) |
| May 4 | 90.0°F (1926) | 19.0°F (1967) | 0.90 in (2020) |
| May 5 | 91.0°F (1909) | 23.0°F (1944) | 1.57 in (1949) |
| May 6 | 91.0°F (2016) | 17.1°F (1976) | 1.22 in (2024) |
| May 7 | 89.1°F (1934) | 21.0°F (1929) | 1.55 in (1978) |
| May 8 | 99.0°F (1934) | 24.1°F (1980) | 1.53 in (1986) |
| May 9 | 93.0°F (1911) | 19.0°F (1966) | 1.50 in (1926) |
| May 10 | 90.0°F (1987) | 21.0°F (1981) | 1.38 in (2015) |
| May 11 | 91.0°F (1900) | 19.0°F (1946) | 1.00 in (1922) |
| May 12 | 88.0°F (2025) | 19.0°F (1946) | 2.57 in (1963) |
| May 13 | 91.9°F (1894) | 25.0°F (1953) | 1.35 in (1957) |
| May 14 | 93.9°F (1932) | 25.0°F (1921) | 1.15 in (1908) |
| May 15 | 96.1°F (1894) | 23.0°F (1959) | 1.45 in (1962) |
| May 16 | 99.0°F (1934) | 23.0°F (1929) | 1.52 in (1962) |
| May 17 | 99.0°F (1934) | 21.0°F (1925) | 1.19 in (1961) |
| May 18 | 93.9°F (1934) | 25.0°F (2002) | 1.35 in (1962) |
| May 19 | 93.9°F (2009) | 28.0°F (1894) | 1.00 in (1918) |
| May 20 | 96.1°F (1934) | 26.1°F (1907) | 1.32 in (1957) |
| May 21 | 91.9°F (1964) | 28.0°F (1924) | 1.70 in (1909) |
| May 22 | 91.9°F (1964) | 21.9°F (1931) | 2.48 in (1972) |
| May 23 | 91.9°F (1928) | 30.0°F (1917) | 1.75 in (1965) |
| May 24 | 95.0°F (1926) | 19.9°F (1897) | 1.64 in (1909) |
| May 25 | 91.9°F (1926) | 28.0°F (1925) | 1.18 in (1907) |
| May 26 | 91.0°F (1911) | 30.0°F (1961) | 0.98 in (1939) |
| May 27 | 96.1°F (2018) | 28.0°F (1928) | 7.14 in (1931) |
| May 28 | 102.0°F (1934) | 30.9°F (1965) | 1.40 in (1972) |
| May 29 | 97.0°F (1934) | 30.9°F (1930) | 2.09 in (1942) |
| May 30 | 106.0°F (1934) | 30.9°F (1947) | 2.16 in (2022) |
| May 31 | 100.9°F (1934) | 24.1°F (1897) | 3.26 in (1945) |