S
M
T
W
T
F
S
30
78°
64°
31
N/A
1
86°
62°
2
82°
62°
3
88°
68°
4
90°
67°
5
88°
67°
6
86°
59°
7
78°
62°
8
76°
60°
9
78°
54°
10
76°
52°
11
73°
51°
12
72°
54°
13
73°
52°
14
72°
50°
15
76°
55°
16
74°
50°
17
73°
55°
18
73°
55°
19
72°
52°
20
73°
53°
21
75°
55°
22
75°
55°
23
74°
54°
24
76°
55°
25
75°
54°
26
74°
52°
27
75°
53°
28
74°
52°
29
73°
51°
30
73°
53°
1
72°
53°
2
73°
51°
3
72°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Francis
St. Francis's September 2026 forecast shows daily high temperatures ranging from 72° to 90°, with overnight lows between 50° and 68°. The average high for September is 76° with an average low of 55°. 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 St. Francis. See also: October | November | December.
