August weather in Grafton, WI
The average temperature in Grafton in August is 70.2°F (60.7°F–79.8°F). Average precipitation: 3.77 inches.
August is a summer month in Grafton, and is warmer than the annual average of 47.8°F. Daily temperatures swing about 19.1°F between overnight low and afternoon high. Daylight averages about 13h 47m. For travel, August is one of the best months of the year to visit.
Avg High
79.8°F
Avg Low
60.7°F
Precipitation
3.77 in
Daylight
13h 47m
August records in Grafton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 91.0°F (2011) | 52.0°F (2019) | 0.27 in (2013) |
| August 2 | 88.0°F (2011) | 55.0°F (2009) | 0.67 in (2024) |
| August 3 | 93.9°F (2011) | 55.9°F (2009) | 1.00 in (2020) |
| August 4 | 89.1°F (2023) | 53.1°F (2020) | 1.73 in (2017) |
| August 5 | 91.9°F (2018) | 53.1°F (2020) | 0.14 in (2014) |
| August 6 | 90.0°F (2018) | 55.9°F (2009) | 0.75 in (2019) |
| August 7 | 88.0°F (2022) | 55.0°F (2020) | 1.05 in (2021) |
| August 8 | 91.0°F (2010) | 57.0°F (2020) | 4.20 in (2021) |
| August 9 | 91.0°F (2025) | 55.0°F (2024) | 0.83 in (2010) |
| August 10 | 93.0°F (2025) | 55.0°F (2024) | 6.75 in (2025) |
| August 11 | 87.1°F (2016) | 55.0°F (2012) | 0.93 in (2017) |
| August 12 | 90.0°F (2016) | 55.0°F (2012) | 0.60 in (2025) |
| August 13 | 87.1°F (2021) | 51.1°F (2013) | 0.89 in (2011) |
| August 14 | 86.0°F (2010) | 48.9°F (2013) | 0.15 in (2011) |
| August 15 | 93.9°F (2009) | 54.0°F (2013) | 3.14 in (2023) |
| August 16 | 88.0°F (2009) | 52.0°F (2013) | 0.94 in (2024) |
| August 17 | 89.1°F (2015) | 54.0°F (2012) | 0.89 in (2014) |
| August 18 | 88.0°F (2015) | 53.1°F (2012) | 0.59 in (2018) |
| August 19 | 86.0°F (2016) | 55.0°F (2009) | 0.94 in (2014) |
| August 20 | 84.0°F (2013) | 39.0°F (2013) | 0.61 in (2022) |
| August 21 | 88.0°F (2023) | 52.0°F (2024) | 1.13 in (2018) |
| August 22 | 90.0°F (2013) | 51.1°F (2024) | 0.56 in (2014) |
| August 23 | 87.1°F (2020) | 51.1°F (2009) | 0.11 in (2013) |
| August 24 | 99.0°F (2023) | 51.1°F (2017) | 0.18 in (2011) |
| August 25 | 91.9°F (2020) | 51.1°F (2017) | 2.29 in (2022) |
| August 26 | 91.0°F (2013) | 51.1°F (2017) | 1.60 in (2020) |
| August 27 | 91.9°F (2013) | 51.1°F (2015) | 5.34 in (2018) |
| August 28 | 96.1°F (2013) | 51.1°F (2017) | 1.27 in (2017) |
| August 29 | 87.1°F (2021) | 52.0°F (2019) | 1.61 in (2015) |
| August 30 | 88.0°F (2010) | 48.0°F (2009) | 0.32 in (2021) |
| August 31 | 95.0°F (2013) | 44.1°F (2009) | 0.28 in (2014) |