August weather in Index, WA
The average temperature in Index in August is 64.7°F (52.2°F–77.1°F). Average precipitation: 1.90 inches.
August is a summer month in Index, and is warmer than the annual average of 49.8°F. Daily temperatures swing about 24.9°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 6m. For travel, August is one of the best months of the year to visit.
Avg High
77.1°F
Avg Low
52.2°F
Precipitation
1.90 in
Daylight
14h 6m
August records in Index
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 95.0°F (2015) | 46.9°F (1975) | 0.85 in (2008) |
| August 2 | 91.9°F (2009) | 44.1°F (1987) | 0.86 in (1996) |
| August 3 | 93.0°F (1993) | 44.1°F (2002) | 0.37 in (2016) |
| August 4 | 93.9°F (2017) | 44.1°F (1979) | 0.21 in (2010) |
| August 5 | 93.0°F (2012) | 45.0°F (1978) | 0.85 in (1996) |
| August 6 | 93.9°F (2012) | 41.0°F (1975) | 1.20 in (2002) |
| August 7 | 91.0°F (1981) | 46.0°F (1974) | 1.43 in (1995) |
| August 8 | 95.0°F (1978) | 43.0°F (1979) | 0.92 in (1995) |
| August 9 | 98.1°F (1981) | 42.1°F (1975) | 0.52 in (1994) |
| August 10 | 96.1°F (1981) | 45.0°F (1970) | 0.53 in (2019) |
| August 11 | 95.0°F (1990) | 44.1°F (1972) | 1.03 in (1983) |
| August 12 | 93.9°F (2014) | 42.1°F (2000) | 0.54 in (2018) |
| August 13 | 93.0°F (2021) | 43.0°F (2000) | 1.75 in (2014) |
| August 14 | 91.0°F (2021) | 43.0°F (2000) | 0.31 in (2009) |
| August 15 | 93.0°F (2010) | 43.0°F (1982) | 1.30 in (1978) |
| August 16 | 97.0°F (2010) | 42.1°F (2000) | 0.66 in (1978) |
| August 17 | 97.0°F (2020) | 42.1°F (1970) | 0.71 in (1980) |
| August 18 | 93.0°F (2012) | 37.9°F (1973) | 1.29 in (1980) |
| August 19 | 87.1°F (2015) | 42.1°F (1973) | 0.64 in (1976) |
| August 20 | 96.1°F (2016) | 41.0°F (1973) | 1.44 in (2008) |
| August 21 | 91.9°F (2016) | 39.9°F (1973) | 1.56 in (1989) |
| August 22 | 86.0°F (2018) | 39.0°F (1973) | 1.35 in (2001) |
| August 23 | 88.0°F (2017) | 37.9°F (1973) | 2.13 in (1975) |
| August 24 | 87.1°F (1982) | 42.1°F (1992) | 1.37 in (2004) |
| August 25 | 88.0°F (2022) | 39.9°F (1973) | 1.42 in (2004) |
| August 26 | 90.0°F (2022) | 43.0°F (1991) | 0.67 in (2004) |
| August 27 | 89.1°F (2016) | 39.9°F (2000) | 1.98 in (1980) |
| August 28 | 93.0°F (2009) | 42.1°F (2000) | 0.77 in (2013) |
| August 29 | 93.0°F (1996) | 33.1°F (1991) | 3.13 in (1977) |
| August 30 | 90.0°F (2017) | 42.1°F (2020) | 1.77 in (2013) |
| August 31 | 91.9°F (2022) | 42.1°F (1977) | 0.85 in (1971) |