S
M
T
W
T
F
S
30
76°
65°
31
79°
66°
1
81°
66°
2
81°
65°
3
80°
58°
4
79°
57°
5
73°
58°
6
73°
63°
7
75°
63°
8
79°
64°
9
77°
63°
10
78°
62°
11
76°
59°
12
77°
57°
13
77°
62°
14
76°
63°
15
77°
63°
16
78°
57°
17
76°
61°
18
73°
59°
19
76°
56°
20
71°
53°
21
68°
51°
22
68°
56°
23
67°
55°
24
73°
51°
25
67°
50°
26
65°
50°
27
66°
55°
28
70°
56°
29
72°
52°
30
70°
51°
1
63°
54°
2
64°
47°
3
63°
49°
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 63° to 81°, with overnight lows between 47° and 66°. The average high for September is 73° with an average low of 58°. 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.
