S
M
T
W
T
F
S
31
77°
46°
1
77°
50°
2
79°
52°
3
71°
55°
4
64°
47°
5
64°
52°
6
63°
47°
7
66°
41°
8
68°
39°
9
73°
44°
10
80°
49°
11
80°
53°
12
82°
53°
13
77°
56°
14
84°
58°
15
84°
56°
16
81°
56°
17
83°
53°
18
87°
57°
19
84°
61°
20
82°
57°
21
75°
59°
22
78°
63°
23
75°
62°
24
71°
59°
25
74°
58°
26
78°
52°
27
82°
55°
28
78°
55°
29
81°
51°
30
80°
53°
1
74°
52°
2
76°
46°
3
85°
52°
4
85°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lowell
Lowell's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
