May weather in Mattawa, WA
The average temperature in Mattawa in May is 64.0°F (52.7°F–75.2°F). Average precipitation: 0.55 inches.
May is a spring month in Mattawa, and is warmer than the annual average of 56°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 14h 50m. For travel, May is one of the best months of the year to visit.
Avg High
75.2°F
Avg Low
52.7°F
Precipitation
0.55 in
Daylight
14h 50m
May records in Mattawa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 90.0°F (1957) | 36.0°F (1963) | 0.05 in (1979) |
| May 2 | 89.1°F (1998) | 37.9°F (1988) | 0.20 in (2007) |
| May 3 | 91.9°F (1966) | 33.1°F (1967) | 0.21 in (1975) |
| May 4 | 88.0°F (1990) | 36.0°F (1985) | 0.26 in (2009) |
| May 5 | 91.9°F (1966) | 34.0°F (1968) | 0.14 in (1963) |
| May 6 | 98.1°F (1992) | 35.1°F (1959) | 0.48 in (1986) |
| May 7 | 93.0°F (1987) | 34.0°F (1963) | 0.30 in (1972) |
| May 8 | 97.0°F (1987) | 39.9°F (1999) | 0.35 in (1957) |
| May 9 | 96.1°F (1987) | 36.0°F (2000) | 0.23 in (1961) |
| May 10 | 98.1°F (2013) | 30.0°F (1989) | 0.46 in (1980) |
| May 11 | 93.9°F (2013) | 30.0°F (1989) | 0.12 in (1967) |
| May 12 | 100.0°F (1993) | 36.0°F (1989) | 0.88 in (1970) |
| May 13 | 93.0°F (1973) | 33.1°F (1991) | 1.30 in (2015) |
| May 14 | 93.0°F (1973) | 36.0°F (1990) | 0.11 in (1961) |
| May 15 | 97.0°F (1973) | 30.9°F (1991) | 1.00 in (2011) |
| May 16 | 96.1°F (2006) | 37.0°F (2003) | 0.24 in (2023) |
| May 17 | 102.0°F (2008) | 35.1°F (2003) | 0.23 in (2025) |
| May 18 | 100.0°F (2006) | 35.1°F (1991) | 0.19 in (2010) |
| May 19 | 95.0°F (1958) | 35.1°F (2003) | 0.19 in (1969) |
| May 20 | 93.9°F (2023) | 28.9°F (1991) | 0.19 in (2006) |
| May 21 | 93.0°F (1958) | 39.0°F (1960) | 0.84 in (1972) |
| May 22 | 98.1°F (1958) | 33.1°F (1996) | 0.65 in (2006) |
| May 23 | 102.9°F (2001) | 41.0°F (1964) | 0.28 in (1962) |
| May 24 | 100.0°F (1994) | 35.1°F (1990) | 0.30 in (1962) |
| May 25 | 98.1°F (1999) | 35.1°F (1994) | 0.36 in (1998) |
| May 26 | 98.1°F (1958) | 44.1°F (1978) | 0.70 in (2010) |
| May 27 | 102.9°F (1958) | 43.0°F (1977) | 0.36 in (1989) |
| May 28 | 97.0°F (1983) | 39.9°F (1979) | 0.25 in (2010) |
| May 29 | 102.9°F (1983) | 42.1°F (1993) | 0.46 in (2013) |
| May 30 | 105.1°F (1986) | 46.0°F (1982) | 0.28 in (1998) |
| May 31 | 104.0°F (1986) | 39.9°F (1993) | 0.39 in (1971) |