S
M
T
W
T
F
S
30
100°
69°
31
99°
68°
1
98°
69°
2
98°
69°
3
97°
68°
4
97°
67°
5
98°
61°
6
96°
58°
7
90°
59°
8
90°
61°
9
92°
64°
10
95°
66°
11
97°
61°
12
97°
62°
13
96°
65°
14
96°
61°
15
95°
59°
16
91°
60°
17
92°
65°
18
95°
63°
19
96°
62°
20
95°
60°
21
92°
62°
22
87°
62°
23
85°
58°
24
88°
62°
25
87°
57°
26
90°
56°
27
87°
55°
28
86°
56°
29
86°
55°
30
84°
57°
1
84°
64°
2
90°
62°
3
89°
60°
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 84° to 100°, with overnight lows between 55° and 69°. The average high for September is 92° 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.
