S
M
T
W
T
F
S
30
84°
69°
31
90°
66°
1
93°
70°
2
94°
73°
3
95°
73°
4
95°
71°
5
92°
73°
6
82°
70°
7
81°
68°
8
83°
62°
9
87°
62°
10
91°
65°
11
92°
68°
12
86°
68°
13
89°
69°
14
91°
68°
15
79°
68°
16
86°
65°
17
90°
64°
18
94°
70°
19
86°
67°
20
84°
68°
21
90°
67°
22
83°
63°
23
63°
57°
24
64°
48°
25
76°
47°
26
78°
48°
27
77°
50°
28
78°
53°
29
77°
57°
30
80°
64°
1
79°
64°
2
77°
62°
3
75°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bethlehem
Bethlehem's September 2026 forecast shows daily high temperatures ranging from 64° to 80°, with overnight lows between 47° and 64°. The average high for September is 76° with an average low of 56°. 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 Bethlehem. See also: October | November | December.
