S
M
T
W
T
F
S
30
75°
51°
31
76°
50°
1
74°
53°
2
73°
59°
3
74°
57°
4
71°
53°
5
72°
51°
6
71°
53°
7
73°
53°
8
74°
51°
9
75°
53°
10
74°
50°
11
75°
51°
12
71°
52°
13
72°
58°
14
78°
57°
15
Hist. Avg.
79°
48°
16
Hist. Avg.
78°
48°
17
Hist. Avg.
78°
48°
18
Hist. Avg.
78°
48°
19
Hist. Avg.
77°
47°
20
Hist. Avg.
77°
47°
21
Hist. Avg.
76°
47°
22
Hist. Avg.
76°
47°
23
Hist. Avg.
76°
46°
24
Hist. Avg.
75°
46°
25
Hist. Avg.
75°
46°
26
Hist. Avg.
74°
46°
27
Hist. Avg.
74°
46°
28
Hist. Avg.
74°
45°
29
Hist. Avg.
73°
45°
30
Hist. Avg.
73°
45°
1
Hist. Avg.
72°
45°
2
Hist. Avg.
72°
44°
3
Hist. Avg.
71°
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 78°, with overnight lows between 50° and 59°. The average high for September is 74° 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.
