S
M
T
W
T
F
S
30
69°
44°
31
70°
41°
1
70°
44°
2
71°
46°
3
73°
47°
4
75°
41°
5
72°
42°
6
71°
41°
7
66°
38°
8
65°
39°
9
64°
38°
10
63°
40°
11
67°
41°
12
67°
38°
13
69°
42°
14
69°
44°
15
70°
41°
16
69°
34°
17
61°
32°
18
58°
32°
19
58°
33°
20
59°
35°
21
61°
40°
22
67°
42°
23
67°
40°
24
63°
39°
25
64°
38°
26
57°
32°
27
57°
31°
28
56°
33°
29
55°
36°
30
64°
39°
1
64°
38°
2
Hist. Avg.
63°
33°
3
Hist. Avg.
62°
32°
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 55° to 75°, with overnight lows between 31° and 47°. The average high for September is 65° with an average low of 39°. 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.
