S
M
T
W
T
F
S
30
83°
65°
31
82°
68°
1
88°
69°
2
92°
73°
3
85°
68°
4
77°
67°
5
77°
61°
6
77°
55°
7
77°
55°
8
82°
68°
9
74°
60°
10
77°
50°
11
78°
60°
12
80°
58°
13
76°
63°
14
75°
62°
15
71°
54°
16
71°
52°
17
73°
55°
18
73°
51°
19
71°
50°
20
68°
49°
21
69°
54°
22
66°
53°
23
67°
54°
24
71°
54°
25
74°
53°
26
73°
53°
27
73°
52°
28
74°
55°
29
74°
55°
30
75°
54°
1
74°
52°
2
73°
47°
3
60°
44°
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 60° to 82°, with overnight lows between 44° and 68°. The average high for September is 73° with an average low of 54°. 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.
