S
M
T
W
T
F
S
30
80°
53°
31
69°
55°
1
73°
60°
2
72°
59°
3
72°
57°
4
78°
54°
5
81°
57°
6
80°
56°
7
88°
58°
8
90°
54°
9
87°
55°
10
88°
54°
11
84°
51°
12
87°
53°
13
86°
54°
14
88°
51°
15
89°
52°
16
84°
51°
17
86°
52°
18
81°
53°
19
86°
52°
20
87°
53°
21
87°
53°
22
86°
51°
23
80°
52°
24
83°
51°
25
85°
53°
26
87°
54°
27
87°
54°
28
86°
53°
29
85°
53°
30
86°
52°
1
85°
53°
2
83°
52°
3
78°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Martinez
Martinez's September 2026 forecast shows daily high temperatures ranging from 72° to 90°, with overnight lows between 51° and 58°. The average high for September is 85° with an average low of 53°. 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 Martinez. See also: October | November | December.
