August weather in Winnetka, IL
The average temperature in Winnetka in August is 72.2°F (62.3°F–82.0°F). Average precipitation: 4.16 inches.
August is a summer month in Winnetka, and is warmer than the annual average of 49.6°F. Daily temperatures swing about 19.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 42m. For travel, August is a comfortable month to visit.
Avg High
82.0°F
Avg Low
62.3°F
Precipitation
4.16 in
Daylight
13h 42m
August records in Winnetka
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (2006) | 50.0°F (1990) | 0.58 in (2000) |
| August 2 | 100.9°F (1988) | 55.0°F (2009) | 2.90 in (2001) |
| August 3 | 100.9°F (1991) | 55.0°F (1985) | 1.17 in (2015) |
| August 4 | 99.0°F (1988) | 53.1°F (1992) | 3.22 in (1989) |
| August 5 | 98.1°F (1988) | 51.1°F (1992) | 1.88 in (2007) |
| August 6 | 95.0°F (2018) | 48.0°F (1994) | 2.20 in (1986) |
| August 7 | 95.0°F (1984) | 48.9°F (1990) | 2.30 in (2007) |
| August 8 | 97.0°F (2001) | 51.1°F (1989) | 1.57 in (1991) |
| August 9 | 99.0°F (1988) | 54.0°F (1990) | 1.04 in (1988) |
| August 10 | 98.1°F (2005) | 54.0°F (1994) | 3.50 in (2012) |
| August 11 | 93.0°F (2002) | 48.9°F (1982) | 0.92 in (1983) |
| August 12 | 95.0°F (1988) | 46.9°F (2004) | 0.99 in (2005) |
| August 13 | 96.1°F (1988) | 52.0°F (1986) | 1.96 in (1985) |
| August 14 | 97.0°F (1995) | 51.1°F (1984) | 5.54 in (1987) |
| August 15 | 97.0°F (1995) | 46.0°F (1997) | 2.02 in (1987) |
| August 16 | 93.0°F (2000) | 50.0°F (1992) | 0.83 in (1993) |
| August 17 | 100.9°F (1988) | 48.9°F (1992) | 2.34 in (1983) |
| August 18 | 100.0°F (1988) | 52.0°F (2002) | 2.90 in (1990) |
| August 19 | 91.9°F (1990) | 51.1°F (1992) | 2.00 in (2007) |
| August 20 | 97.0°F (1983) | 48.9°F (1992) | 2.43 in (2007) |
| August 21 | 95.0°F (2010) | 50.0°F (1992) | 1.97 in (1990) |
| August 22 | 98.1°F (2003) | 48.0°F (2004) | 4.98 in (2002) |
| August 23 | 93.0°F (2007) | 52.0°F (1997) | 2.10 in (2001) |
| August 24 | 91.9°F (1993) | 51.1°F (1986) | 1.94 in (2007) |
| August 25 | 95.0°F (2012) | 50.0°F (2017) | 1.53 in (1999) |
| August 26 | 93.9°F (1994) | 54.0°F (1984) | 1.77 in (1987) |
| August 27 | 95.0°F (1993) | 50.0°F (2015) | 1.79 in (1987) |
| August 28 | 95.0°F (1990) | 44.1°F (1986) | 0.97 in (2004) |
| August 29 | 96.1°F (1984) | 42.1°F (1986) | 1.79 in (2018) |
| August 30 | 96.1°F (1984) | 46.0°F (1986) | 0.61 in (2017) |
| August 31 | 96.1°F (2013) | 45.0°F (2009) | 0.90 in (1991) |