S
M
T
W
T
F
S
30
87°
70°
31
90°
70°
1
93°
70°
2
95°
72°
3
95°
72°
4
93°
72°
5
97°
72°
6
97°
70°
7
79°
66°
8
85°
66°
9
85°
68°
10
86°
71°
11
86°
68°
12
85°
68°
13
88°
68°
14
88°
67°
15
87°
68°
16
84°
67°
17
85°
64°
18
86°
63°
19
84°
64°
20
82°
60°
21
86°
65°
22
85°
64°
23
84°
64°
24
84°
63°
25
83°
64°
26
84°
64°
27
85°
63°
28
84°
64°
29
83°
63°
30
83°
63°
1
82°
62°
2
82°
59°
3
75°
56°
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 75° to 88°, with overnight lows between 56° and 71°. The average high for September is 84° with an average low of 65°. 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.
