S
M
T
W
T
F
S
30
86°
70°
31
86°
66°
1
90°
64°
2
88°
68°
3
88°
72°
4
91°
72°
5
84°
70°
6
73°
66°
7
79°
66°
8
81°
66°
9
84°
61°
10
82°
52°
11
84°
59°
12
73°
54°
13
68°
50°
14
68°
54°
15
72°
55°
16
75°
52°
17
68°
64°
18
70°
63°
19
66°
61°
20
67°
52°
21
56°
50°
22
60°
45°
23
63°
53°
24
63°
53°
25
68°
53°
26
63°
55°
27
68°
52°
28
69°
54°
29
66°
48°
30
71°
50°
1
71°
53°
2
68°
44°
3
63°
50°
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 71°, with overnight lows between 44° and 55°. The average high for September is 65° with an average low of 51°. 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.
