S
M
T
W
T
F
S
30
80°
54°
31
77°
64°
1
87°
68°
2
70°
66°
3
88°
67°
4
87°
68°
5
81°
62°
6
80°
58°
7
80°
52°
8
82°
51°
9
85°
56°
10
87°
67°
11
82°
55°
12
82°
50°
13
N/A
14
76°
48°
15
74°
50°
16
82°
61°
17
84°
65°
18
83°
57°
19
74°
57°
20
72°
53°
21
70°
52°
22
68°
52°
23
70°
51°
24
70°
50°
25
73°
53°
26
72°
52°
27
73°
54°
28
75°
53°
29
75°
50°
30
69°
47°
1
68°
50°
2
69°
52°
3
73°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Somerville
Somerville's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 47° and 65°. The average high for September is 74° with an average low of 53°. 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.
