S
M
T
W
T
F
S
30
79°
55°
31
68°
57°
1
72°
60°
2
72°
57°
3
76°
56°
4
75°
58°
5
76°
51°
6
77°
57°
7
87°
51°
8
95°
54°
9
94°
63°
10
97°
70°
11
82°
59°
12
74°
58°
13
75°
54°
14
84°
51°
15
80°
52°
16
67°
57°
17
77°
55°
18
84°
55°
19
88°
56°
20
74°
55°
21
81°
54°
22
83°
56°
23
90°
58°
24
87°
57°
25
89°
56°
26
86°
58°
27
86°
57°
28
84°
55°
29
83°
56°
30
82°
52°
1
84°
54°
2
78°
55°
3
84°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pleasanton
Pleasanton's September 2026 forecast shows daily high temperatures ranging from 74° to 90°, with overnight lows between 52° and 58°. The average high for September is 84° 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 Pleasanton. See also: October | November | December.
