S
M
T
W
T
F
S
30
84°
68°
31
86°
70°
1
90°
71°
2
93°
69°
3
82°
69°
4
82°
67°
5
80°
64°
6
80°
60°
7
76°
59°
8
72°
58°
9
75°
56°
10
75°
59°
11
73°
53°
12
71°
52°
13
74°
55°
14
75°
52°
15
77°
57°
16
78°
57°
17
76°
56°
18
76°
57°
19
77°
57°
20
78°
56°
21
78°
57°
22
77°
56°
23
78°
56°
24
77°
55°
25
76°
56°
26
77°
55°
27
76°
54°
28
76°
54°
29
75°
53°
30
74°
53°
1
74°
52°
2
73°
53°
3
74°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Berlin
New Berlin's September 2026 forecast shows daily high temperatures ranging from 71° to 93°, with overnight lows between 52° and 71°. The average high for September is 77° with an average low of 57°. 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 New Berlin. See also: October | November | December.
