October weather in Grand Coulee, WA
The average temperature in Grand Coulee in October is 50.1°F (40.1°F–60.2°F). Average precipitation: 0.94 inches.
October is a fall month in Grand Coulee, and is warmer than the annual average of 49.9°F. Daily temperatures swing about 20.1°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 10h 34m. For travel, October is a comfortable month to visit.
Avg High
60.2°F
Avg Low
40.1°F
Precipitation
0.94 in
Daylight
10h 34m
October records in Grand Coulee
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 88.0°F (1935) | 33.1°F (1983) | 0.39 in (1951) |
| October 2 | 90.0°F (1935) | 33.1°F (1986) | 0.34 in (1951) |
| October 3 | 87.1°F (1935) | 34.0°F (1950) | 0.51 in (1937) |
| October 4 | 84.0°F (1988) | 34.0°F (1977) | 0.35 in (1949) |
| October 5 | 81.0°F (1980) | 30.9°F (2001) | 0.60 in (2016) |
| October 6 | 82.9°F (1943) | 32.0°F (2000) | 0.53 in (1981) |
| October 7 | 84.0°F (2014) | 32.0°F (1949) | 0.18 in (1973) |
| October 8 | 82.0°F (1943) | 25.0°F (1985) | 0.26 in (1950) |
| October 9 | 86.0°F (1936) | 28.0°F (1985) | 0.54 in (1947) |
| October 10 | 87.1°F (1934) | 25.0°F (2019) | 0.42 in (1962) |
| October 11 | 84.0°F (1934) | 21.0°F (2009) | 0.22 in (1984) |
| October 12 | 81.0°F (1936) | 23.0°F (2009) | 0.38 in (2025) |
| October 13 | 78.1°F (1939) | 28.0°F (2002) | 0.59 in (2016) |
| October 14 | 73.9°F (1945) | 28.0°F (2017) | 0.63 in (2016) |
| October 15 | 79.0°F (1963) | 30.0°F (1992) | 0.35 in (1990) |
| October 16 | 75.0°F (1936) | 28.9°F (1999) | 1.36 in (2006) |
| October 17 | 73.9°F (1936) | 23.0°F (1984) | 0.56 in (2004) |
| October 18 | 75.9°F (1940) | 27.0°F (1984) | 0.30 in (1988) |
| October 19 | 80.1°F (1940) | 25.0°F (1949) | 0.48 in (1971) |
| October 20 | 75.0°F (2003) | 21.9°F (1985) | 0.45 in (2016) |
| October 21 | 81.0°F (1939) | 27.0°F (1984) | 0.31 in (1934) |
| October 22 | 78.1°F (1939) | 27.0°F (2020) | 0.59 in (2014) |
| October 23 | 72.0°F (1936) | 21.9°F (1945) | 0.36 in (1970) |
| October 24 | 73.9°F (1936) | 23.0°F (2002) | 0.60 in (1940) |
| October 25 | 72.0°F (1937) | 23.0°F (2020) | 0.76 in (2023) |
| October 26 | 72.0°F (1937) | 19.0°F (2002) | 0.40 in (2009) |
| October 27 | 68.0°F (1936) | 23.0°F (2020) | 0.25 in (1950) |
| October 28 | 72.0°F (2003) | 17.1°F (1991) | 0.47 in (2018) |
| October 29 | 68.0°F (1987) | 19.0°F (2019) | 0.40 in (1950) |
| October 30 | 66.9°F (2015) | 15.1°F (2002) | 0.40 in (2001) |
| October 31 | 70.0°F (1967) | 10.0°F (1984) | 0.30 in (1934) |