S
M
T
W
T
F
S
31
62°
50°
1
63°
47°
2
62°
49°
3
65°
53°
4
58°
44°
5
60°
36°
6
69°
36°
7
70°
59°
8
67°
53°
9
67°
51°
10
55°
43°
11
58°
47°
12
60°
42°
13
63°
51°
14
69°
49°
15
75°
54°
16
68°
53°
17
71°
49°
18
66°
42°
19
71°
51°
20
73°
45°
21
61°
50°
22
62°
44°
23
64°
45°
24
65°
53°
25
65°
51°
26
75°
54°
27
75°
47°
28
67°
48°
29
72°
42°
30
72°
54°
1
71°
49°
2
65°
46°
3
66°
51°
4
76°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Somerville
Somerville's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
