May weather in Portsmouth, NH
The average temperature in Portsmouth in May is °F (°F–°F). Average precipitation: 3.97 inches.
May is a spring month in Portsmouth, and is cooler than the annual average of 0°F. Expect about 12 days with precipitation. Daylight averages about 14h 28m.
Avg High
°F
Avg Low
°F
Precipitation
3.97 in
Daylight
14h 28m
May records in Portsmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | — | — | 2.08 in (2023) |
| May 2 | — | — | 0.76 in (2006) |
| May 3 | — | — | 2.01 in (2006) |
| May 4 | — | — | 0.60 in (2008) |
| May 5 | — | — | 1.43 in (2025) |
| May 6 | — | — | 1.10 in (2017) |
| May 7 | — | — | 0.79 in (2009) |
| May 8 | — | — | 0.67 in (2011) |
| May 9 | — | — | 0.62 in (2012) |
| May 10 | — | — | 1.26 in (2006) |
| May 11 | — | — | 0.80 in (2007) |
| May 12 | — | — | 1.06 in (1998) |
| May 13 | — | — | 3.50 in (2006) |
| May 14 | — | — | 3.60 in (2006) |
| May 15 | — | — | 3.80 in (2006) |
| May 16 | — | — | 1.12 in (2006) |
| May 17 | — | — | 1.52 in (2007) |
| May 18 | — | — | 0.62 in (2004) |
| May 19 | — | — | 1.47 in (2010) |
| May 20 | — | — | 1.10 in (2010) |
| May 21 | — | — | 2.08 in (2023) |
| May 22 | — | — | 1.13 in (2013) |
| May 23 | — | — | 1.95 in (2025) |
| May 24 | — | — | 1.78 in (2004) |
| May 25 | — | — | 1.41 in (2005) |
| May 26 | — | — | 2.23 in (2017) |
| May 27 | — | — | 1.70 in (2003) |
| May 28 | — | — | 0.61 in (2009) |
| May 29 | — | — | 0.89 in (2021) |
| May 30 | — | — | 0.41 in (2016) |
| May 31 | — | — | 1.37 in (2021) |