S
M
T
W
T
F
S
30
89°
69°
31
89°
70°
1
88°
71°
2
89°
70°
3
84°
69°
4
84°
67°
5
85°
64°
6
82°
63°
7
82°
62°
8
87°
65°
9
88°
68°
10
89°
67°
11
88°
59°
12
82°
67°
13
85°
60°
14
83°
59°
15
82°
60°
16
86°
63°
17
87°
65°
18
87°
65°
19
86°
59°
20
83°
57°
21
78°
57°
22
78°
58°
23
79°
62°
24
78°
62°
25
80°
63°
26
77°
62°
27
83°
62°
28
77°
57°
29
81°
58°
30
83°
56°
1
81°
59°
2
81°
60°
3
76°
51°
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 76° to 89°, with overnight lows between 51° and 71°. The average high for September is 83° with an average low of 62°. 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.
