S
M
T
W
T
F
S
30
95°
60°
31
94°
59°
1
86°
54°
2
85°
57°
3
86°
60°
4
84°
58°
5
89°
61°
6
82°
60°
7
87°
63°
8
91°
65°
9
96°
64°
10
93°
63°
11
89°
62°
12
90°
63°
13
89°
64°
14
90°
65°
15
93°
63°
16
96°
68°
17
96°
67°
18
92°
64°
19
92°
65°
20
94°
66°
21
95°
66°
22
95°
65°
23
94°
65°
24
92°
64°
25
93°
65°
26
94°
65°
27
94°
66°
28
92°
65°
29
93°
64°
30
92°
63°
1
93°
64°
2
92°
64°
3
91°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Porterville
Porterville's September 2026 forecast shows daily high temperatures ranging from 82° to 96°, with overnight lows between 57° and 68°. The average high for September is 91° 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 Porterville. See also: October | November | December.
