May weather in Waltham, MA
The average temperature in Waltham in May is 58.6°F (46.7°F–70.4°F). Average precipitation: 3.36 inches.
May is a spring month in Waltham, and is warmer than the annual average of 50.5°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 25m. For travel, May is a comfortable month to visit.
Avg High
70.4°F
Avg Low
46.7°F
Precipitation
3.36 in
Daylight
14h 25m
May records in Waltham
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 84.9°F (2001) | 26.2°F (2008) | 1.27 in (1953) |
| May 2 | 91.0°F (2001) | 27.0°F (1964) | 0.96 in (2006) |
| May 3 | 90.0°F (2001) | 28.9°F (1964) | 0.64 in (1962) |
| May 4 | 89.1°F (2001) | 32.0°F (2017) | 0.63 in (2021) |
| May 5 | 93.0°F (1949) | 30.0°F (2005) | 0.87 in (2017) |
| May 6 | 82.9°F (1950) | 30.0°F (1961) | 0.58 in (1958) |
| May 7 | 90.0°F (2000) | 26.1°F (2001) | 0.89 in (2005) |
| May 8 | 86.0°F (2000) | 32.0°F (1968) | 1.17 in (1958) |
| May 9 | 90.0°F (2000) | 28.9°F (1956) | 1.58 in (1954) |
| May 10 | 90.0°F (1965) | 32.0°F (2020) | 1.11 in (1967) |
| May 11 | 89.1°F (1953) | 30.2°F (2010) | 0.85 in (1951) |
| May 12 | 89.1°F (1959) | 28.9°F (1963) | 1.06 in (1952) |
| May 13 | 84.0°F (2022) | 28.9°F (2005) | 2.86 in (2006) |
| May 14 | 88.0°F (2022) | 30.9°F (1951) | 2.10 in (2006) |
| May 15 | 89.1°F (1951) | 31.1°F (2013) | 0.78 in (1954) |
| May 16 | 90.0°F (1951) | 34.0°F (1949) | 1.80 in (2007) |
| May 17 | 91.0°F (2017) | 33.1°F (2003) | 1.32 in (1970) |
| May 18 | 93.0°F (2017) | 28.2°F (2023) | 1.34 in (1970) |
| May 19 | 91.9°F (1962) | 33.1°F (2002) | 0.83 in (1999) |
| May 20 | 95.0°F (2003) | 30.9°F (2002) | 1.89 in (2023) |
| May 21 | 90.0°F (2009) | 30.9°F (2002) | 1.32 in (1954) |
| May 22 | 96.1°F (2022) | 33.1°F (1950) | 2.28 in (2025) |
| May 23 | 93.0°F (1964) | 39.0°F (2015) | 0.39 in (1956) |
| May 24 | 91.9°F (1964) | 33.1°F (1963) | 1.76 in (1951) |
| May 25 | 91.9°F (2007) | 30.0°F (1956) | 0.93 in (2005) |
| May 26 | 95.0°F (2010) | 34.0°F (1949) | 1.99 in (1967) |
| May 27 | 89.1°F (2011) | 32.0°F (1969) | 0.94 in (1961) |
| May 28 | 95.0°F (2016) | 30.9°F (1968) | 1.15 in (2021) |
| May 29 | 90.0°F (1955) | 33.1°F (2014) | 1.54 in (2002) |
| May 30 | 88.0°F (2022) | 36.0°F (1964) | 1.02 in (2024) |
| May 31 | 91.9°F (1956) | 35.1°F (1961) | 1.11 in (1962) |