May weather in Merton, WI
The average temperature in Merton in May is 56.7°F (45.4°F–68.0°F). Average precipitation: 4.13 inches.
May is a spring month in Merton, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 22.6°F between overnight low and afternoon high. Daylight averages about 14h 29m. For travel, May is a comfortable month to visit.
Avg High
68.0°F
Avg Low
45.4°F
Precipitation
4.13 in
Daylight
14h 29m
May records in Merton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 90.0°F (2013) | 30.0°F (2023) | 0.93 in (2017) |
| May 2 | 90.0°F (2013) | 30.0°F (2023) | 0.57 in (2025) |
| May 3 | 88.0°F (2021) | 33.1°F (2017) | 1.43 in (2018) |
| May 4 | 82.9°F (2015) | 33.1°F (2019) | 1.05 in (2012) |
| May 5 | 80.1°F (2024) | 32.0°F (2022) | 0.52 in (2024) |
| May 6 | 81.0°F (2018) | 36.0°F (2014) | 0.35 in (2019) |
| May 7 | 82.0°F (2016) | 35.1°F (2017) | 0.66 in (2012) |
| May 8 | 82.9°F (2023) | 30.0°F (2017) | 1.69 in (2024) |
| May 9 | 86.0°F (2018) | 21.9°F (2020) | 0.68 in (2019) |
| May 10 | 77.0°F (2022) | 28.9°F (2020) | 1.47 in (2018) |
| May 11 | 91.0°F (2022) | 30.9°F (2021) | 0.87 in (2016) |
| May 12 | 88.0°F (2022) | 33.1°F (2013) | 1.26 in (2011) |
| May 13 | 91.9°F (2022) | 28.0°F (2013) | 1.21 in (2014) |
| May 14 | 91.0°F (2022) | 28.9°F (2013) | 1.08 in (2018) |
| May 15 | 88.0°F (2022) | 30.0°F (2016) | 0.33 in (2020) |
| May 16 | 84.0°F (2012) | 32.0°F (2016) | 1.06 in (2017) |
| May 17 | 84.0°F (2025) | 36.0°F (2011) | 0.29 in (2019) |
| May 18 | 84.0°F (2015) | 36.0°F (2011) | 2.30 in (2020) |
| May 19 | 87.1°F (2024) | 37.0°F (2025) | 0.43 in (2020) |
| May 20 | 87.1°F (2012) | 34.0°F (2015) | 0.17 in (2020) |
| May 21 | 86.0°F (2012) | 36.0°F (2015) | 1.70 in (2025) |
| May 22 | 84.9°F (2024) | 39.0°F (2015) | 0.71 in (2025) |
| May 23 | 89.1°F (2021) | 35.1°F (2025) | 1.36 in (2013) |
| May 24 | 86.0°F (2015) | 35.1°F (2013) | 0.29 in (2017) |
| May 25 | 86.0°F (2012) | 36.0°F (2013) | 1.50 in (2024) |
| May 26 | 88.0°F (2021) | 39.0°F (2013) | 0.83 in (2022) |
| May 27 | 88.0°F (2018) | 36.0°F (2011) | 0.28 in (2012) |
| May 28 | 93.0°F (2018) | 36.0°F (2011) | 0.63 in (2021) |
| May 29 | 91.9°F (2018) | 36.0°F (2021) | 1.55 in (2017) |
| May 30 | 86.0°F (2018) | 36.0°F (2021) | 0.05 in (2011) |
| May 31 | 91.0°F (2011) | 37.0°F (2024) | 0.85 in (2013) |