S
M
T
W
T
F
S
30
78°
57°
31
77°
57°
1
79°
61°
2
79°
60°
3
78°
59°
4
78°
63°
5
79°
63°
6
83°
64°
7
84°
63°
8
83°
62°
9
80°
61°
10
80°
62°
11
81°
62°
12
78°
61°
13
78°
61°
14
74°
60°
15
73°
60°
16
73°
58°
17
74°
57°
18
76°
59°
19
77°
58°
20
76°
57°
21
82°
59°
22
82°
51°
23
78°
48°
24
72°
50°
25
71°
53°
26
69°
57°
27
77°
56°
28
77°
55°
29
78°
53°
30
78°
53°
1
77°
54°
2
76°
54°
3
77°
55°
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 69° to 84°, with overnight lows between 48° and 64°. The average high for September is 77° with an average low of 58°. 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.
