S
M
T
W
T
F
S
30
86°
65°
31
73°
63°
1
69°
63°
2
72°
64°
3
73°
63°
4
85°
66°
5
73°
64°
6
68°
59°
7
80°
59°
8
79°
58°
9
79°
71°
10
84°
61°
11
76°
53°
12
73°
61°
13
80°
64°
14
79°
61°
15
73°
63°
16
73°
60°
17
72°
57°
18
71°
58°
19
72°
56°
20
71°
56°
21
69°
60°
22
66°
59°
23
66°
60°
24
69°
59°
25
68°
58°
26
70°
57°
27
65°
55°
28
66°
57°
29
72°
58°
30
72°
58°
1
71°
57°
2
70°
58°
3
69°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Somerville
Somerville's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 53° and 71°. The average high for September is 72° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Somerville. See also: October | November | December.
