May weather in Johnstown, PA
The average temperature in Johnstown in May is 58.5°F (48.8°F–68.2°F). Average precipitation: 4.12 inches.
May is a spring month in Johnstown, and is warmer than the annual average of 48.9°F. Daily temperatures swing about 19.4°F between overnight low and afternoon high. Expect about 17 days with precipitation. Daylight averages about 14h 14m. For travel, May is a comfortable month to visit.
Avg High
68.2°F
Avg Low
48.8°F
Precipitation
4.12 in
Daylight
14h 14m
May records in Johnstown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 81.0°F (2010) | 33.1°F (2021) | 0.99 in (2009) |
| May 2 | 80.1°F (2018) | 32.0°F (2023) | 0.69 in (2010) |
| May 3 | 82.0°F (2018) | 32.0°F (2023) | 0.81 in (2022) |
| May 4 | 82.0°F (2001) | 28.9°F (2004) | 0.80 in (2009) |
| May 5 | 75.9°F (2010) | 32.0°F (2020) | 1.08 in (2017) |
| May 6 | 78.1°F (2015) | 34.0°F (2020) | 1.38 in (2022) |
| May 7 | 78.1°F (2015) | 32.0°F (2006) | 0.58 in (2022) |
| May 8 | 81.0°F (2015) | 26.2°F (2020) | 1.05 in (2012) |
| May 9 | 81.0°F (2007) | 23.2°F (2020) | 1.06 in (2021) |
| May 10 | 81.0°F (2015) | 31.1°F (2010) | 0.92 in (2008) |
| May 11 | 82.0°F (2015) | 34.0°F (2020) | 1.12 in (2006) |
| May 12 | 81.0°F (2018) | 32.0°F (2008) | 1.09 in (2018) |
| May 13 | 84.0°F (2014) | 32.0°F (2013) | 1.18 in (2025) |
| May 14 | 79.0°F (2004) | 28.2°F (2013) | 0.92 in (2010) |
| May 15 | 82.0°F (2018) | 34.0°F (2016) | 1.02 in (2014) |
| May 16 | 77.0°F (2017) | 34.0°F (2016) | 0.70 in (2014) |
| May 17 | 84.0°F (2017) | 37.0°F (2005) | 1.14 in (2002) |
| May 18 | 82.0°F (2017) | 34.0°F (2002) | 0.86 in (2004) |
| May 19 | 82.9°F (2019) | 30.0°F (2002) | 0.45 in (2004) |
| May 20 | 82.0°F (2021) | 28.0°F (2002) | 0.62 in (2008) |
| May 21 | 84.0°F (2021) | 28.9°F (2002) | 1.18 in (2025) |
| May 22 | 82.0°F (2013) | 32.0°F (2002) | 0.84 in (2001) |
| May 23 | 81.0°F (2021) | 32.0°F (2006) | 0.47 in (2013) |
| May 24 | 79.0°F (2018) | 36.0°F (2013) | 0.61 in (2011) |
| May 25 | 82.0°F (2012) | 33.1°F (2013) | 0.89 in (2001) |
| May 26 | 84.0°F (2012) | 34.0°F (2013) | 0.56 in (2006) |
| May 27 | 82.9°F (2012) | 39.9°F (2013) | 3.15 in (2012) |
| May 28 | 84.0°F (2016) | 39.0°F (2008) | 0.93 in (2009) |
| May 29 | 84.0°F (2006) | 39.9°F (2004) | 1.13 in (2019) |
| May 30 | 87.1°F (2006) | 39.9°F (2001) | 1.05 in (2025) |
| May 31 | 86.0°F (2007) | 36.0°F (2001) | 1.77 in (2018) |