S
M
T
W
T
F
S
30
67°
54°
31
69°
55°
1
71°
51°
2
75°
48°
3
69°
46°
4
74°
47°
5
75°
52°
6
75°
54°
7
74°
53°
8
71°
52°
9
72°
52°
10
76°
52°
11
74°
52°
12
75°
51°
13
73°
53°
14
75°
52°
15
74°
47°
16
73°
41°
17
65°
45°
18
64°
50°
19
69°
51°
20
73°
50°
21
70°
46°
22
70°
41°
23
67°
41°
24
69°
41°
25
Hist. Avg.
64°
44°
26
Hist. Avg.
64°
43°
27
Hist. Avg.
63°
43°
28
Hist. Avg.
63°
42°
29
Hist. Avg.
62°
42°
30
Hist. Avg.
62°
41°
1
Hist. Avg.
61°
41°
2
Hist. Avg.
61°
40°
3
Hist. Avg.
60°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lowell
Lowell's September 2026 forecast shows daily high temperatures ranging from 64° to 76°, with overnight lows between 41° and 55°. The average high for September is 72° with an average low of 49°. 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.
