S
M
T
W
T
F
S
30
91°
63°
31
86°
64°
1
86°
66°
2
90°
69°
3
89°
68°
4
90°
67°
5
90°
68°
6
91°
69°
7
90°
67°
8
88°
66°
9
86°
63°
10
85°
62°
11
87°
63°
12
89°
65°
13
88°
66°
14
88°
65°
15
Hist. Avg.
87°
64°
16
Hist. Avg.
87°
64°
17
Hist. Avg.
86°
63°
18
Hist. Avg.
86°
63°
19
Hist. Avg.
86°
62°
20
Hist. Avg.
85°
62°
21
Hist. Avg.
85°
62°
22
Hist. Avg.
85°
61°
23
Hist. Avg.
84°
61°
24
Hist. Avg.
84°
61°
25
Hist. Avg.
84°
60°
26
Hist. Avg.
84°
60°
27
Hist. Avg.
83°
60°
28
Hist. Avg.
83°
59°
29
Hist. Avg.
82°
59°
30
Hist. Avg.
82°
58°
1
Hist. Avg.
82°
58°
2
Hist. Avg.
81°
58°
3
Hist. Avg.
81°
57°
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 85° to 91°, with overnight lows between 62° and 69°. The average high for September is 88° with an average low of 66°. 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.
