S
M
T
W
T
F
S
30
87°
68°
31
85°
62°
1
79°
61°
2
78°
61°
3
78°
62°
4
79°
63°
5
80°
68°
6
81°
67°
7
81°
67°
8
84°
66°
9
85°
66°
10
83°
67°
11
86°
67°
12
85°
66°
13
84°
67°
14
82°
62°
15
84°
56°
16
76°
56°
17
74°
55°
18
74°
56°
19
75°
61°
20
75°
63°
21
74°
62°
22
74°
60°
23
78°
62°
24
80°
62°
25
81°
61°
26
81°
62°
27
80°
60°
28
80°
51°
29
78°
52°
30
69°
55°
1
68°
56°
2
69°
58°
3
68°
53°
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 68° to 87°, with overnight lows between 51° and 68°. The average high for September is 79° with an average low of 61°. 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.
