S
M
T
W
T
F
S
30
98°
73°
31
98°
73°
1
98°
75°
2
100°
76°
3
92°
76°
4
N/A
5
93°
75°
6
93°
75°
7
94°
75°
8
93°
73°
9
91°
72°
10
98°
71°
11
98°
73°
12
100°
72°
13
98°
71°
14
97°
72°
15
98°
69°
16
96°
70°
17
99°
71°
18
91°
64°
19
93°
68°
20
94°
67°
21
94°
68°
22
93°
67°
23
93°
67°
24
88°
66°
25
85°
66°
26
89°
65°
27
89°
65°
28
90°
64°
29
89°
65°
30
88°
61°
1
83°
55°
2
81°
55°
3
81°
54°
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 81° to 100°, with overnight lows between 54° and 75°. The average high for September is 92° with an average low of 67°. 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.
