S
M
T
W
T
F
S
30
87°
64°
31
82°
72°
1
93°
74°
2
77°
72°
3
89°
72°
4
89°
74°
5
84°
70°
6
83°
66°
7
82°
66°
8
85°
64°
9
89°
71°
10
90°
75°
11
81°
69°
12
83°
65°
13
82°
69°
14
77°
54°
15
78°
59°
16
83°
63°
17
84°
66°
18
83°
63°
19
76°
64°
20
72°
60°
21
73°
58°
22
69°
59°
23
72°
58°
24
71°
57°
25
73°
58°
26
74°
57°
27
77°
61°
28
77°
59°
29
77°
58°
30
72°
54°
1
70°
56°
2
71°
59°
3
76°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Swarthmore
Swarthmore's September 2026 forecast shows daily high temperatures ranging from 69° to 84°, with overnight lows between 54° and 69°. The average high for September is 76° with an average low of 59°. 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 Swarthmore. See also: October | November | December.
