S
M
T
W
T
F
S
30
90°
71°
31
84°
66°
1
82°
63°
2
82°
61°
3
82°
61°
4
81°
63°
5
89°
60°
6
80°
70°
7
91°
71°
8
100°
73°
9
104°
80°
10
96°
75°
11
89°
71°
12
83°
68°
13
84°
69°
14
82°
65°
15
79°
65°
16
77°
67°
17
80°
64°
18
79°
61°
19
82°
61°
20
81°
64°
21
76°
65°
22
80°
64°
23
89°
63°
24
87°
65°
25
86°
65°
26
90°
66°
27
88°
64°
28
85°
63°
29
89°
65°
30
93°
64°
1
91°
62°
2
91°
63°
3
96°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Foothill Ranch
Foothill Ranch's September 2026 forecast shows daily high temperatures ranging from 85° to 96°, with overnight lows between 62° and 66°. The average high for September is 90° with an average low of 64°. 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 Foothill Ranch. See also: October | November | December.
