S
M
T
W
T
F
S
30
80°
45°
31
81°
46°
1
82°
50°
2
83°
54°
3
87°
55°
4
90°
52°
5
91°
44°
6
85°
50°
7
81°
52°
8
86°
48°
9
75°
46°
10
74°
51°
11
76°
53°
12
80°
54°
13
75°
53°
14
81°
43°
15
72°
40°
16
74°
39°
17
71°
41°
18
Hist. Avg.
78°
47°
19
Hist. Avg.
77°
47°
20
Hist. Avg.
77°
47°
21
Hist. Avg.
76°
46°
22
Hist. Avg.
76°
46°
23
Hist. Avg.
75°
46°
24
Hist. Avg.
74°
46°
25
Hist. Avg.
74°
46°
26
Hist. Avg.
73°
45°
27
Hist. Avg.
73°
45°
28
Hist. Avg.
72°
45°
29
Hist. Avg.
72°
44°
30
Hist. Avg.
71°
44°
1
Hist. Avg.
70°
44°
2
Hist. Avg.
70°
44°
3
Hist. Avg.
69°
44°
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 71° to 91°, with overnight lows between 39° and 55°. The average high for September is 80° 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.
