September weather in Watertown Town, MA
The average temperature in Watertown Town in September is 65.2°F (54.9°F–75.5°F). Average precipitation: 3.96 inches.
September is a fall month in Watertown Town, and is warmer than the annual average of 51.2°F. Daily temperatures swing about 20.6°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.5°F
Avg Low
54.9°F
Precipitation
3.96 in
Daylight
12h 16m
September records in Watertown Town
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1973) | 42.1°F (1975) | 0.89 in (1973) |
| September 2 | 98.1°F (1969) | 39.9°F (1971) | 4.75 in (2021) |
| September 3 | 97.0°F (1980) | 43.0°F (1994) | 0.97 in (2002) |
| September 4 | 98.1°F (1973) | 44.1°F (1987) | 2.68 in (1972) |
| September 5 | 98.1°F (1973) | 44.1°F (1989) | 1.52 in (1966) |
| September 6 | 93.9°F (1971) | 42.1°F (1984) | 1.41 in (2022) |
| September 7 | 96.1°F (2018) | 39.0°F (1984) | 1.80 in (2008) |
| September 8 | 97.0°F (2023) | 42.1°F (1984) | 0.98 in (2011) |
| September 9 | 97.0°F (2015) | 39.9°F (1990) | 1.12 in (1969) |
| September 10 | 95.0°F (2016) | 39.0°F (1978) | 1.51 in (1969) |
| September 11 | 91.9°F (1965) | 39.9°F (1995) | 4.12 in (1999) |
| September 12 | 97.0°F (1983) | 42.1°F (1977) | 1.43 in (2009) |
| September 13 | 90.0°F (2005) | 41.0°F (1985) | 1.40 in (1987) |
| September 14 | 88.0°F (1974) | 39.0°F (1978) | 1.50 in (1987) |
| September 15 | 91.0°F (2016) | 35.1°F (1975) | 1.82 in (1989) |
| September 16 | 90.0°F (1993) | 37.0°F (1964) | 1.69 in (2005) |
| September 17 | 91.0°F (1971) | 37.9°F (1986) | 4.20 in (1999) |
| September 18 | 90.0°F (2015) | 37.9°F (1984) | 5.45 in (1996) |
| September 19 | 90.0°F (2015) | 37.0°F (1990) | 1.96 in (2023) |
| September 20 | 91.9°F (1983) | 36.0°F (1964) | 1.65 in (1987) |
| September 21 | 93.9°F (1983) | 34.0°F (1991) | 1.42 in (1977) |
| September 22 | 90.0°F (1965) | 32.0°F (1962) | 1.82 in (1974) |
| September 23 | 93.9°F (1965) | 37.0°F (1969) | 2.13 in (1998) |
| September 24 | 91.9°F (1970) | 37.0°F (1978) | 2.14 in (1994) |
| September 25 | 90.0°F (1984) | 33.1°F (1963) | 1.62 in (1991) |
| September 26 | 91.0°F (1970) | 37.0°F (1967) | 1.78 in (1991) |
| September 27 | 87.1°F (2017) | 34.0°F (1966) | 2.16 in (2008) |
| September 28 | 90.0°F (2014) | 33.1°F (1989) | 2.27 in (1962) |
| September 29 | 84.0°F (2025) | 32.0°F (2000) | 1.75 in (1974) |
| September 30 | 84.9°F (2015) | 33.1°F (1981) | 1.52 in (1963) |