May weather in Dayton, WY
The average temperature in Dayton in May is 51.3°F (37.5°F–65.2°F). Average precipitation: 3.36 inches. Average snowfall is 1.4 inches.
May is a spring month in Dayton, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 27.7°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 38m. For travel, May is cool.
Avg High
65.2°F
Avg Low
37.5°F
Precipitation
3.36 in
Snow
1.4 in
May records in Dayton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 84.0°F (2021) | 19.9°F (2017) | 1.58 in (2003) |
| May 2 | 77.0°F (2007) | 21.9°F (2011) | 0.61 in (2008) |
| May 3 | 82.9°F (2023) | 23.0°F (2011) | 0.44 in (1955) |
| May 4 | 82.0°F (2025) | 26.1°F (2019) | 0.69 in (2007) |
| May 5 | 86.0°F (2025) | 24.1°F (2011) | 1.37 in (2007) |
| May 6 | 82.9°F (2016) | 24.1°F (2011) | 1.14 in (2024) |
| May 7 | 84.9°F (2017) | 17.1°F (2010) | 0.61 in (2014) |
| May 8 | 81.0°F (2021) | 21.9°F (2020) | 2.52 in (2005) |
| May 9 | 82.0°F (2025) | 27.0°F (2009) | 0.74 in (1995) |
| May 10 | 90.0°F (2025) | 28.0°F (2009) | 0.85 in (2016) |
| May 11 | 88.0°F (2025) | 27.0°F (2019) | 2.05 in (2005) |
| May 12 | 91.0°F (2025) | 26.1°F (2012) | 1.10 in (1957) |
| May 13 | 86.0°F (2013) | 28.9°F (2016) | 0.34 in (1957) |
| May 14 | 91.0°F (2013) | 30.0°F (2011) | 0.85 in (1957) |
| May 15 | 79.0°F (2019) | 26.1°F (2011) | 1.40 in (1952) |
| May 16 | 84.0°F (2012) | 30.9°F (2022) | 0.97 in (1999) |
| May 17 | 84.9°F (2024) | 30.0°F (2016) | 2.21 in (2000) |
| May 18 | 84.9°F (2009) | 30.0°F (2016) | 2.20 in (2017) |
| May 19 | 93.9°F (2009) | 32.0°F (2016) | 0.62 in (2012) |
| May 20 | 79.0°F (2008) | 28.0°F (2017) | 0.89 in (2011) |
| May 21 | 84.9°F (2023) | 27.0°F (2022) | 1.71 in (2011) |
| May 22 | 84.9°F (2023) | 27.0°F (2022) | 1.42 in (2008) |
| May 23 | 89.1°F (2023) | 28.9°F (2007) | 0.89 in (2008) |
| May 24 | 79.0°F (2023) | 28.9°F (2007) | 1.42 in (1996) |
| May 25 | 86.0°F (2017) | 32.0°F (2022) | 2.67 in (2015) |
| May 26 | 80.1°F (2022) | 32.0°F (2012) | 1.23 in (2023) |
| May 27 | 82.9°F (2014) | 35.1°F (2008) | 0.91 in (2007) |
| May 28 | 82.0°F (2014) | 36.0°F (2012) | 1.91 in (1956) |
| May 29 | 95.0°F (2014) | 32.0°F (2010) | 1.32 in (2018) |
| May 30 | 88.0°F (2020) | 34.0°F (2019) | 0.92 in (2011) |
| May 31 | 91.0°F (2020) | 32.0°F (2022) | 1.24 in (1957) |