S
M
T
W
T
F
S
30
83°
55°
31
70°
56°
1
74°
59°
2
75°
56°
3
76°
57°
4
77°
54°
5
81°
53°
6
77°
51°
7
87°
56°
8
92°
58°
9
86°
59°
10
87°
58°
11
88°
59°
12
82°
58°
13
83°
57°
14
86°
58°
15
85°
55°
16
81°
56°
17
87°
57°
18
82°
59°
19
87°
59°
20
88°
58°
21
88°
58°
22
87°
56°
23
81°
57°
24
84°
56°
25
87°
58°
26
88°
59°
27
89°
59°
28
88°
58°
29
87°
57°
30
86°
58°
1
87°
57°
2
84°
57°
3
79°
56°
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 75° to 92°, with overnight lows between 51° and 59°. The average high for September is 84° 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.
