S
M
T
W
T
F
S
30
97°
70°
31
97°
72°
1
100°
75°
2
99°
75°
3
100°
77°
4
100°
75°
5
101°
72°
6
99°
68°
7
96°
70°
8
95°
74°
9
96°
76°
10
95°
72°
11
90°
69°
12
92°
71°
13
93°
70°
14
92°
69°
15
96°
71°
16
95°
69°
17
93°
70°
18
83°
61°
19
81°
66°
20
83°
65°
21
88°
66°
22
86°
65°
23
85°
64°
24
86°
65°
25
86°
66°
26
85°
65°
27
85°
64°
28
84°
64°
29
85°
63°
30
85°
64°
1
83°
59°
2
81°
55°
3
72°
51°
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 72° to 101°, with overnight lows between 51° and 76°. The average high for September is 89° 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.
