S
M
T
W
T
F
S
30
88°
69°
31
88°
68°
1
89°
67°
2
88°
68°
3
87°
66°
4
87°
67°
5
88°
68°
6
88°
67°
7
89°
67°
8
89°
66°
9
88°
67°
10
89°
67°
11
88°
66°
12
89°
67°
13
88°
67°
14
86°
58°
15
77°
60°
16
80°
63°
17
79°
58°
18
87°
62°
19
87°
63°
20
86°
62°
21
85°
60°
22
78°
61°
23
75°
60°
24
77°
60°
25
77°
59°
26
79°
60°
27
83°
60°
28
83°
59°
29
82°
59°
30
83°
58°
1
82°
49°
2
74°
47°
3
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Livermore
Livermore's September 2026 forecast shows daily high temperatures ranging from 68° to 89°, with overnight lows between 46° and 69°. The average high for September is 84° 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 Livermore. See also: October | November | December.
