S
M
T
W
T
F
S
30
83°
60°
31
82°
62°
1
80°
62°
2
84°
60°
3
84°
52°
4
76°
53°
5
76°
60°
6
78°
60°
7
82°
53°
8
76°
55°
9
74°
57°
10
75°
59°
11
80°
58°
12
83°
59°
13
82°
58°
14
82°
57°
15
81°
55°
16
75°
55°
17
74°
49°
18
74°
48°
19
72°
45°
20
70°
45°
21
69°
46°
22
70°
53°
23
71°
46°
24
74°
49°
25
75°
53°
26
74°
53°
27
77°
54°
28
77°
51°
29
76°
49°
30
73°
48°
1
70°
48°
2
75°
50°
3
68°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lowell
Lowell's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 42° and 62°. The average high for September is 76° 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 Lowell. See also: October | November | December.
