S
M
T
W
T
F
S
30
66°
55°
31
71°
55°
1
71°
53°
2
78°
60°
3
74°
52°
4
78°
54°
5
79°
57°
6
79°
56°
7
78°
51°
8
86°
56°
9
98°
61°
10
84°
64°
11
72°
61°
12
72°
56°
13
76°
52°
14
78°
51°
15
73°
57°
16
74°
55°
17
74°
55°
18
75°
54°
19
72°
59°
20
72°
60°
21
73°
60°
22
71°
55°
23
78°
53°
24
80°
55°
25
79°
56°
26
74°
51°
27
72°
50°
28
71°
49°
29
79°
53°
30
74°
55°
1
75°
55°
2
78°
55°
3
87°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lompoc
Lompoc's September 2026 forecast shows daily high temperatures ranging from 78° to 87°, with overnight lows between 55° and 57°. The average high for September is 83° with an average low of 56°. 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 Lompoc. See also: October | November | December.
