S
M
T
W
T
F
S
30
77°
43°
31
87°
47°
1
68°
53°
2
61°
53°
3
68°
53°
4
61°
54°
5
72°
54°
6
65°
54°
7
74°
52°
8
80°
46°
9
86°
46°
10
86°
48°
11
72°
43°
12
66°
50°
13
68°
50°
14
72°
47°
15
67°
44°
16
79°
47°
17
83°
48°
18
71°
49°
19
69°
46°
20
78°
44°
21
73°
52°
22
74°
48°
23
71°
42°
24
79°
54°
25
62°
41°
26
71°
41°
27
70°
41°
28
70°
44°
29
69°
55°
30
71°
55°
1
69°
50°
2
66°
49°
3
67°
50°
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 62° to 79°, with overnight lows between 41° and 55°. The average high for September is 69° with an average low of 48°. 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.
