S
M
T
W
T
F
S
30
99°
75°
31
100°
76°
1
100°
76°
2
102°
76°
3
103°
78°
4
98°
77°
5
99°
78°
6
100°
75°
7
100°
75°
8
102°
76°
9
97°
76°
10
100°
76°
11
101°
78°
12
101°
77°
13
101°
78°
14
100°
78°
15
99°
75°
16
97°
74°
17
98°
73°
18
97°
73°
19
91°
68°
20
92°
70°
21
92°
68°
22
90°
67°
23
92°
71°
24
85°
70°
25
92°
71°
26
92°
70°
27
87°
70°
28
87°
69°
29
90°
70°
30
91°
70°
1
91°
69°
2
87°
69°
3
86°
68°
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 85° to 101°, with overnight lows between 67° and 78°. The average high for September is 93° with an average low of 72°. 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.
