S
M
T
W
T
F
S
30
83°
55°
31
70°
56°
1
74°
59°
2
77°
55°
3
77°
56°
4
75°
56°
5
82°
50°
6
80°
54°
7
89°
50°
8
96°
56°
9
104°
63°
10
100°
64°
11
88°
59°
12
82°
58°
13
76°
57°
14
86°
51°
15
84°
53°
16
74°
55°
17
73°
57°
18
82°
52°
19
86°
57°
20
70°
56°
21
75°
56°
22
77°
56°
23
91°
51°
24
94°
58°
25
81°
55°
26
82°
48°
27
74°
54°
28
82°
53°
29
94°
50°
30
93°
54°
1
92°
55°
2
95°
57°
3
100°
61°
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 92° to 100°, with overnight lows between 54° and 61°. The average high for September is 95° with an average low of 57°. 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.
