S
M
T
W
T
F
S
30
76°
54°
31
78°
60°
1
81°
60°
2
76°
60°
3
84°
60°
4
84°
55°
5
79°
55°
6
77°
51°
7
76°
53°
8
82°
57°
9
82°
57°
10
81°
56°
11
76°
49°
12
75°
54°
13
77°
55°
14
81°
49°
15
73°
53°
16
72°
54°
17
71°
52°
18
72°
50°
19
77°
46°
20
72°
52°
21
76°
48°
22
75°
53°
23
77°
49°
24
78°
50°
25
77°
53°
26
77°
52°
27
76°
54°
28
76°
52°
29
75°
47°
30
70°
49°
1
75°
53°
2
76°
49°
3
75°
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 70° to 84°, with overnight lows between 44° and 60°. The average high for September is 77° with an average low of 53°. 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.
