Somerville Weather in September
Average highs run from 96°F on September 1 to 89°F on September 30, and lows from 68°F to 59°F. Normal precipitation for the month is 3.41 in over about 7 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 92°F
- Average low
- 64°F
- Precipitation
- 3.41 in
- Record high
- 113°FSep 5, 2000
- Record low
- 43°FSep 27, 1942
- Chance of a freeze
- 0%
- Days of 90°F or more
- 22.0
- Daylight
- 12 h 46 min to 11 h 54 min
- Cloud cover
- 46%
- Humidity
- 69%
- Dew point
- 66°F
- Wind
- 6.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 96°F | 68°F | 109°F 2000 | 61°F 1915 | 24% |
| Sep 2 | 95°F | 68°F | 108°F 2000 | 61°F 1915 | 24% |
| Sep 3 | 95°F | 68°F | 109°F 2000 | 60°F 1955 | 25% |
| Sep 4 | 95°F | 68°F | 109°F 2000 | 57°F 1974 | 25% |
| Sep 5 | 95°F | 67°F | 113°F 2000 | 54°F 1974 | 25% |
| Sep 6 | 94°F | 67°F | 110°F 2000 | 54°F 1974 | 25% |
| Sep 7 | 94°F | 67°F | 103°F 1963 | 53°F 1974 | 25% |
| Sep 8 | 94°F | 67°F | 105°F 1963 | 53°F 1974 | 25% |
| Sep 9 | 94°F | 66°F | 106°F 2023 | 57°F 1957 | 25% |
| Sep 10 | 93°F | 66°F | 101°F 1925 | 59°F 1957 | 25% |
| Sep 11 | 93°F | 66°F | 102°F 1954 | 56°F 1907 | 24% |
| Sep 12 | 93°F | 66°F | 102°F 1964 | 54°F 1940 | 24% |
| Sep 13 | 93°F | 65°F | 103°F 2011 | 54°F 1902 | 24% |
| Sep 14 | 93°F | 65°F | 104°F 2011 | 53°F 1902 | 24% |
| Sep 15 | 92°F | 65°F | 101°F 1911 | 52°F 1902 | 24% |
| Sep 16 | 92°F | 64°F | 100°F 1911 | 53°F 1902 | 24% |
| Sep 17 | 92°F | 64°F | 101°F 1911 | 52°F 1961 | 24% |
| Sep 18 | 92°F | 64°F | 102°F 1995 | 50°F 1981 | 24% |
| Sep 19 | 91°F | 63°F | 99°F 1925 | 48°F 1981 | 24% |
| Sep 20 | 91°F | 63°F | 103°F 1956 | 48°F 1981 | 23% |
| Sep 21 | 91°F | 63°F | 102°F 1956 | 49°F 2006 | 23% |
| Sep 22 | 91°F | 62°F | 102°F 1909 | 46°F 1983 | 23% |
| Sep 23 | 90°F | 62°F | 102°F 2005 | 46°F 1983 | 23% |
| Sep 24 | 90°F | 61°F | 100°F 1912 | 50°F 1983 | 23% |
| Sep 25 | 90°F | 61°F | 98°F 1977 | 49°F 1989 | 23% |
| Sep 26 | 90°F | 61°F | 105°F 2005 | 51°F 1975 | 23% |
| Sep 27 | 89°F | 60°F | 105°F 2005 | 43°F 1942 | 22% |
| Sep 28 | 89°F | 60°F | 104°F 2005 | 44°F 1942 | 22% |
| Sep 29 | 89°F | 60°F | 103°F 2005 | 46°F 1967 | 22% |
| Sep 30 | 89°F | 59°F | 100°F 1926 | 46°F 1967 | 22% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 7:03 AM, sunset 7:49 PM
- September 30
- sunrise 7:19 AM, sunset 7:13 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00418446 (Somerville Dam), public domain. Records: NOAA GHCN-Daily, station USC00411048, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.