May weather in Richland, WA
The average temperature in Richland in May is 61.1°F (48.3°F–73.9°F). Average precipitation: 0.63 inches.
May is a spring month in Richland, and is warmer than the annual average of 53.6°F. Daily temperatures swing about 25.6°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 14h 47m. For travel, May is a comfortable month to visit.
Avg High
73.9°F
Avg Low
48.3°F
Precipitation
0.63 in
Daylight
14h 47m
May records in Richland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1957) | 30.0°F (1954) | 0.15 in (1984) |
| May 2 | 91.9°F (1946) | 33.1°F (1954) | 0.14 in (1957) |
| May 3 | 91.9°F (1945) | 35.1°F (2006) | 0.13 in (1977) |
| May 4 | 90.0°F (1966) | 34.0°F (1962) | 0.30 in (2016) |
| May 5 | 93.0°F (1966) | 34.0°F (1965) | 0.38 in (2024) |
| May 6 | 98.1°F (1947) | 35.1°F (1950) | 0.27 in (1963) |
| May 7 | 95.0°F (1987) | 34.0°F (1984) | 0.40 in (1963) |
| May 8 | 96.1°F (1987) | 33.1°F (2002) | 0.38 in (1991) |
| May 9 | 95.0°F (1987) | 33.1°F (1999) | 0.32 in (1957) |
| May 10 | 97.0°F (1949) | 34.0°F (1999) | 0.79 in (1961) |
| May 11 | 98.1°F (1949) | 34.0°F (1999) | 0.47 in (2004) |
| May 12 | 100.0°F (1949) | 37.9°F (2012) | 0.34 in (1958) |
| May 13 | 100.0°F (1949) | 37.0°F (1983) | 0.96 in (2015) |
| May 14 | 95.0°F (1949) | 34.0°F (1955) | 0.39 in (2011) |
| May 15 | 93.9°F (1973) | 39.0°F (1974) | 0.87 in (1994) |
| May 16 | 96.1°F (2006) | 37.9°F (1983) | 0.53 in (1945) |
| May 17 | 96.1°F (2006) | 37.9°F (1974) | 0.62 in (2025) |
| May 18 | 98.1°F (1956) | 37.0°F (1965) | 0.25 in (2010) |
| May 19 | 98.1°F (1954) | 36.0°F (2003) | 0.48 in (1994) |
| May 20 | 100.9°F (1947) | 42.1°F (1950) | 0.40 in (2004) |
| May 21 | 96.1°F (1958) | 39.0°F (1960) | 0.41 in (2004) |
| May 22 | 98.1°F (1958) | 37.9°F (1960) | 0.59 in (1946) |
| May 23 | 100.0°F (1958) | 37.9°F (1964) | 0.47 in (1962) |
| May 24 | 98.1°F (1947) | 39.0°F (1986) | 0.55 in (1962) |
| May 25 | 104.0°F (1947) | 41.0°F (1964) | 0.56 in (1981) |
| May 26 | 105.1°F (1947) | 42.1°F (1967) | 0.57 in (1980) |
| May 27 | 102.0°F (1958) | 39.0°F (1989) | 0.30 in (1945) |
| May 28 | 93.9°F (1952) | 39.0°F (1976) | 0.33 in (1982) |
| May 29 | 100.9°F (1983) | 39.9°F (1951) | 0.48 in (1988) |
| May 30 | 102.0°F (1986) | 39.9°F (1950) | 0.20 in (1969) |
| May 31 | 104.0°F (1986) | 42.1°F (1950) | 0.56 in (2000) |