S
M
T
W
T
F
S
30
80°
68°
31
80°
64°
1
81°
65°
2
82°
65°
3
86°
68°
4
87°
67°
5
87°
67°
6
81°
66°
7
80°
65°
8
78°
66°
9
80°
65°
10
81°
65°
11
84°
64°
12
85°
65°
13
86°
64°
14
85°
64°
15
84°
63°
16
82°
63°
17
82°
62°
18
83°
62°
19
81°
61°
20
82°
62°
21
81°
60°
22
80°
58°
23
78°
57°
24
80°
59°
25
81°
60°
26
80°
60°
27
81°
55°
28
79°
53°
29
71°
56°
30
70°
52°
1
72°
55°
2
75°
58°
3
71°
59°
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 70° to 87°, with overnight lows between 52° and 68°. The average high for September is 80° 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 Bethlehem. See also: October | November | December.
