S
M
T
W
T
F
S
30
90°
72°
31
92°
72°
1
94°
71°
2
96°
72°
3
97°
74°
4
96°
74°
5
97°
71°
6
99°
72°
7
92°
73°
8
92°
70°
9
92°
70°
10
89°
71°
11
86°
70°
12
89°
69°
13
89°
71°
14
88°
70°
15
87°
68°
16
87°
66°
17
88°
69°
18
87°
65°
19
84°
65°
20
83°
61°
21
88°
65°
22
85°
64°
23
86°
65°
24
86°
65°
25
85°
64°
26
86°
65°
27
86°
64°
28
85°
64°
29
85°
63°
30
84°
64°
1
85°
62°
2
81°
56°
3
73°
52°
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 73° to 92°, with overnight lows between 52° and 73°. The average high for September is 86° 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.
