S
M
T
W
T
F
S
30
80°
68°
31
80°
66°
1
81°
68°
2
83°
68°
3
88°
69°
4
87°
68°
5
87°
69°
6
86°
68°
7
83°
67°
8
82°
66°
9
82°
67°
10
80°
67°
11
83°
66°
12
80°
65°
13
80°
64°
14
82°
64°
15
82°
63°
16
84°
64°
17
85°
65°
18
80°
64°
19
83°
63°
20
84°
64°
21
82°
60°
22
84°
60°
23
84°
56°
24
79°
59°
25
78°
58°
26
77°
56°
27
78°
61°
28
79°
61°
29
85°
62°
30
84°
61°
1
83°
60°
2
82°
59°
3
83°
57°
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 77° to 88°, with overnight lows between 56° and 69°. The average high for September is 82° with an average low of 64°. 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.
