S
M
T
W
T
F
S
30
75°
50°
31
78°
48°
1
78°
47°
2
72°
60°
3
64°
58°
4
78°
58°
5
68°
52°
6
71°
51°
7
75°
56°
8
73°
50°
9
66°
57°
10
74°
55°
11
68°
48°
12
71°
46°
13
68°
49°
14
73°
53°
15
73°
52°
16
74°
46°
17
72°
51°
18
64°
46°
19
71°
50°
20
69°
49°
21
66°
49°
22
66°
48°
23
67°
49°
24
66°
47°
25
64°
48°
26
65°
48°
27
66°
49°
28
65°
47°
29
60°
45°
30
62°
45°
1
59°
42°
2
58°
41°
3
56°
45°
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 56° to 78°, with overnight lows between 41° and 58°. The average high for September is 67° with an average low of 49°. 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.
