August weather in Mattawa, WA
The average temperature in Mattawa in August is 78.1°F (65.9°F–90.2°F). Average precipitation: 0.08 inches.
August is a summer month in Mattawa, and is warmer than the annual average of 56°F. Daily temperatures swing about 24.3°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 14h 1m. For travel, August is hot.
Avg High
90.2°F
Avg Low
65.9°F
Precipitation
0.08 in
Daylight
14h 1m
August records in Mattawa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 108.0°F (1971) | 50.0°F (1972) | 0.10 in (1976) |
| August 2 | 106.0°F (1961) | 51.1°F (1964) | 0.02 in (2004) |
| August 3 | 109.0°F (1961) | 55.9°F (1989) | 0.20 in (1960) |
| August 4 | 109.9°F (1961) | 55.0°F (1996) | 0.00 in (1958) |
| August 5 | 106.0°F (1998) | 50.0°F (1969) | 0.25 in (2004) |
| August 6 | 108.0°F (1972) | 55.9°F (2002) | 0.25 in (2003) |
| August 7 | 109.9°F (1972) | 52.0°F (1996) | 0.05 in (1962) |
| August 8 | 109.9°F (1972) | 53.1°F (1962) | 0.35 in (2023) |
| August 9 | 108.0°F (1971) | 54.0°F (1985) | 0.03 in (2008) |
| August 10 | 109.9°F (1971) | 55.9°F (1995) | 0.27 in (2019) |
| August 11 | 109.0°F (1971) | 55.0°F (1995) | 0.30 in (1983) |
| August 12 | 106.0°F (1977) | 55.0°F (1995) | 0.11 in (2009) |
| August 13 | 108.0°F (1992) | 51.1°F (1995) | 0.19 in (1987) |
| August 14 | 106.0°F (1992) | 46.0°F (1995) | 0.21 in (1979) |
| August 15 | 108.0°F (2023) | 55.0°F (1960) | 0.75 in (1961) |
| August 16 | 108.0°F (2023) | 50.0°F (1976) | 0.02 in (1993) |
| August 17 | 108.0°F (1977) | 54.0°F (1976) | 0.00 in (1957) |
| August 18 | 109.0°F (1967) | 51.1°F (1976) | 0.77 in (1975) |
| August 19 | 105.1°F (1967) | 54.0°F (1996) | 0.09 in (1990) |
| August 20 | 104.0°F (1977) | 50.0°F (1980) | 0.39 in (1968) |
| August 21 | 102.9°F (1961) | 48.0°F (1980) | 0.85 in (1990) |
| August 22 | 104.0°F (1961) | 46.0°F (1960) | 0.37 in (1965) |
| August 23 | 105.1°F (1961) | 44.1°F (1992) | 0.06 in (1975) |
| August 24 | 102.9°F (1966) | 43.0°F (1980) | 0.31 in (1977) |
| August 25 | 102.9°F (1958) | 48.9°F (1992) | 0.35 in (1976) |
| August 26 | 104.0°F (1958) | 48.0°F (1992) | 0.16 in (1979) |
| August 27 | 100.9°F (1972) | 48.9°F (2000) | 0.33 in (1989) |
| August 28 | 105.1°F (1972) | 48.9°F (1984) | 0.14 in (1975) |
| August 29 | 102.9°F (1998) | 45.0°F (1980) | 0.32 in (1983) |
| August 30 | 100.0°F (1967) | 52.0°F (1964) | 0.88 in (1977) |
| August 31 | 104.0°F (1967) | 42.1°F (1999) | 0.02 in (2010) |