August weather in Onalaska, WI
The average temperature in Onalaska in August is 72.8°F (62.3°F–83.2°F). Average precipitation: 3.90 inches.
August is a summer month in Onalaska, and is warmer than the annual average of 48.8°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 49m. For travel, August is a comfortable month to visit.
Avg High
83.2°F
Avg Low
62.3°F
Precipitation
3.90 in
Daylight
13h 49m
August records in Onalaska
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 105.1°F (1988) | 48.9°F (1976) | 1.34 in (1952) |
| August 2 | 102.9°F (1988) | 45.0°F (1948) | 1.48 in (1981) |
| August 3 | 100.9°F (1988) | 48.9°F (1950) | 1.84 in (1959) |
| August 4 | 98.1°F (1947) | 46.9°F (1971) | 1.34 in (2016) |
| August 5 | 96.1°F (1947) | 45.0°F (1948) | 2.52 in (1981) |
| August 6 | 100.0°F (2001) | 45.0°F (1948) | 1.82 in (1938) |
| August 7 | 99.0°F (2001) | 48.9°F (1976) | 5.59 in (2021) |
| August 8 | 97.0°F (1949) | 50.0°F (1972) | 2.55 in (2009) |
| August 9 | 95.0°F (1949) | 45.0°F (1972) | 0.66 in (1977) |
| August 10 | 96.1°F (1944) | 45.0°F (1982) | 2.73 in (1994) |
| August 11 | 95.0°F (1988) | 45.0°F (1982) | 1.33 in (2007) |
| August 12 | 95.0°F (1995) | 46.0°F (1982) | 1.14 in (1940) |
| August 13 | 95.0°F (1978) | 46.0°F (1941) | 1.84 in (2010) |
| August 14 | 95.0°F (1978) | 43.0°F (1964) | 1.65 in (1981) |
| August 15 | 97.0°F (1988) | 43.0°F (1979) | 2.01 in (1944) |
| August 16 | 100.9°F (1988) | 44.1°F (1976) | 1.08 in (1980) |
| August 17 | 102.9°F (1988) | 48.0°F (1941) | 2.09 in (1938) |
| August 18 | 100.0°F (1947) | 44.1°F (1943) | 4.05 in (2007) |
| August 19 | 96.1°F (1955) | 43.0°F (1950) | 2.71 in (2007) |
| August 20 | 97.0°F (1955) | 36.0°F (1950) | 3.47 in (1939) |
| August 21 | 102.9°F (1955) | 39.9°F (2004) | 1.17 in (1939) |
| August 22 | 96.1°F (1947) | 39.0°F (1950) | 2.84 in (1973) |
| August 23 | 104.0°F (2023) | 42.1°F (1940) | 1.32 in (1963) |
| August 24 | 104.0°F (1948) | 39.0°F (1942) | 1.17 in (1982) |
| August 25 | 99.0°F (1948) | 43.0°F (1958) | 1.87 in (1972) |
| August 26 | 97.0°F (2013) | 46.0°F (1964) | 2.16 in (1959) |
| August 27 | 96.1°F (2013) | 43.0°F (1941) | 3.04 in (2018) |
| August 28 | 97.0°F (1955) | 42.1°F (1986) | 1.80 in (1960) |
| August 29 | 95.0°F (1966) | 39.9°F (1965) | 2.02 in (2024) |
| August 30 | 97.0°F (2012) | 46.0°F (1967) | 2.56 in (1962) |
| August 31 | 95.0°F (1953) | 42.1°F (1967) | 2.10 in (1989) |