August weather in Merrimac, WI
The average temperature in Merrimac in August is 70.1°F (58.7°F–81.4°F). Average precipitation: 4.35 inches.
August is a summer month in Merrimac, and is warmer than the annual average of 47.1°F. Daily temperatures swing about 22.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 47m. For travel, August is a comfortable month to visit.
Avg High
81.4°F
Avg Low
58.7°F
Precipitation
4.35 in
Daylight
13h 47m
August records in Merrimac
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 98.1°F (2006) | 48.9°F (2025) | 0.11 in (2022) |
| August 2 | 95.0°F (2006) | 48.9°F (2025) | 0.49 in (2014) |
| August 3 | 93.0°F (2011) | 48.9°F (2025) | 0.12 in (2016) |
| August 4 | 93.0°F (2012) | 48.0°F (2013) | 1.12 in (2019) |
| August 5 | 91.0°F (2016) | 48.0°F (2013) | 2.60 in (2007) |
| August 6 | 91.0°F (2016) | 48.9°F (2012) | 0.87 in (2019) |
| August 7 | 93.0°F (2022) | 51.1°F (2020) | 1.22 in (2022) |
| August 8 | 91.0°F (2012) | 52.0°F (2008) | 1.32 in (2010) |
| August 9 | 91.0°F (2020) | 51.1°F (2024) | 1.35 in (2010) |
| August 10 | 90.0°F (2010) | 48.0°F (2008) | 0.76 in (2025) |
| August 11 | 93.0°F (2021) | 46.0°F (2012) | 1.22 in (2025) |
| August 12 | 88.0°F (2007) | 51.1°F (2011) | 0.92 in (2016) |
| August 13 | 93.9°F (2010) | 50.0°F (2013) | 1.57 in (2016) |
| August 14 | 90.0°F (2018) | 45.0°F (2013) | 0.79 in (2008) |
| August 15 | 91.9°F (2015) | 45.0°F (2014) | 3.15 in (2023) |
| August 16 | 93.9°F (2015) | 46.9°F (2014) | 1.00 in (2012) |
| August 17 | 90.0°F (2015) | 50.0°F (2013) | 1.06 in (2018) |
| August 18 | 84.9°F (2008) | 45.0°F (2012) | 0.41 in (2009) |
| August 19 | 90.0°F (2016) | 45.0°F (2012) | 6.20 in (2007) |
| August 20 | 90.0°F (2016) | 50.0°F (2012) | 1.60 in (2007) |
| August 21 | 91.0°F (2021) | 45.0°F (2012) | 3.27 in (2018) |
| August 22 | 90.0°F (2013) | 46.0°F (2012) | 0.65 in (2007) |
| August 23 | 91.0°F (2014) | 46.0°F (2012) | 2.09 in (2013) |
| August 24 | 99.0°F (2023) | 48.0°F (2009) | 2.45 in (2006) |
| August 25 | 97.0°F (2023) | 44.1°F (2017) | 0.81 in (2022) |
| August 26 | 91.9°F (2024) | 45.0°F (2017) | 0.90 in (2014) |
| August 27 | 95.0°F (2024) | 46.0°F (2025) | 1.20 in (2018) |
| August 28 | 93.9°F (2020) | 46.9°F (2025) | 2.60 in (2020) |
| August 29 | 91.9°F (2007) | 48.0°F (2011) | 1.75 in (2018) |
| August 30 | 91.0°F (2010) | 46.9°F (2023) | 0.73 in (2024) |
| August 31 | 91.0°F (2012) | 39.0°F (2009) | 0.45 in (2017) |