S
M
T
W
T
F
S
30
95°
60°
31
94°
59°
1
85°
54°
2
85°
58°
3
85°
59°
4
84°
61°
5
89°
61°
6
89°
64°
7
87°
63°
8
91°
65°
9
92°
64°
10
92°
66°
11
100°
68°
12
98°
66°
13
92°
64°
14
93°
63°
15
97°
68°
16
96°
68°
17
96°
67°
18
95°
65°
19
93°
64°
20
92°
64°
21
93°
65°
22
94°
65°
23
94°
64°
24
89°
57°
25
83°
56°
26
83°
56°
27
82°
55°
28
83°
56°
29
84°
59°
30
89°
60°
1
84°
57°
2
84°
58°
3
89°
61°
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 100°, with overnight lows between 54° and 68°. The average high for September is 90° with an average low of 62°. 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.
