May weather in Merrimac, WI
The average temperature in Merrimac in May is 58.9°F (47.0°F–70.7°F). Average precipitation: 4.60 inches.
May is a spring month in Merrimac, and is warmer than the annual average of 47.1°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 30m. For travel, May is a comfortable month to visit.
Avg High
70.7°F
Avg Low
47.0°F
Precipitation
4.60 in
Daylight
14h 30m
May records in Merrimac
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (2013) | 33.1°F (2015) | 1.13 in (2010) |
| May 2 | 90.0°F (2021) | 33.1°F (2011) | 0.97 in (2018) |
| May 3 | 86.0°F (2021) | 32.0°F (2017) | 0.73 in (2018) |
| May 4 | 84.9°F (2012) | 26.1°F (2011) | 3.19 in (2018) |
| May 5 | 82.0°F (2010) | 28.9°F (2011) | 0.18 in (2015) |
| May 6 | 82.0°F (2018) | 28.9°F (2011) | 0.46 in (2019) |
| May 7 | 88.0°F (2016) | 33.1°F (2006) | 0.61 in (2009) |
| May 8 | 84.0°F (2015) | 30.0°F (2021) | 1.47 in (2024) |
| May 9 | 82.9°F (2013) | 24.1°F (2020) | 0.83 in (2019) |
| May 10 | 82.9°F (2022) | 30.9°F (2025) | 1.44 in (2013) |
| May 11 | 91.0°F (2022) | 30.9°F (2021) | 0.57 in (2010) |
| May 12 | 90.0°F (2022) | 28.9°F (2020) | 1.11 in (2006) |
| May 13 | 96.1°F (2022) | 30.0°F (2013) | 1.27 in (2010) |
| May 14 | 93.0°F (2022) | 30.0°F (2013) | 3.10 in (2009) |
| May 15 | 90.0°F (2013) | 30.0°F (2016) | 0.30 in (2023) |
| May 16 | 89.1°F (2025) | 34.0°F (2016) | 0.54 in (2017) |
| May 17 | 87.1°F (2017) | 30.9°F (2011) | 0.39 in (2019) |
| May 18 | 87.1°F (2017) | 33.1°F (2009) | 1.65 in (2020) |
| May 19 | 88.0°F (2012) | 32.0°F (2008) | 0.45 in (2021) |
| May 20 | 91.0°F (2012) | 36.0°F (2006) | 0.88 in (2013) |
| May 21 | 87.1°F (2012) | 35.1°F (2008) | 2.18 in (2025) |
| May 22 | 84.0°F (2007) | 34.0°F (2006) | 1.30 in (2024) |
| May 23 | 87.1°F (2016) | 35.1°F (2022) | 0.26 in (2017) |
| May 24 | 91.9°F (2010) | 35.1°F (2013) | 0.33 in (2019) |
| May 25 | 93.9°F (2010) | 41.0°F (2025) | 1.70 in (2024) |
| May 26 | 88.0°F (2010) | 34.0°F (2023) | 1.49 in (2011) |
| May 27 | 93.0°F (2018) | 33.1°F (2011) | 3.23 in (2015) |
| May 28 | 96.1°F (2018) | 33.1°F (2008) | 0.95 in (2014) |
| May 29 | 98.1°F (2018) | 32.0°F (2021) | 0.86 in (2020) |
| May 30 | 96.1°F (2018) | 35.1°F (2021) | 1.29 in (2015) |
| May 31 | 91.0°F (2010) | 39.0°F (2009) | 0.70 in (2018) |