S
M
T
W
T
F
S
30
92°
72°
31
92°
74°
1
91°
74°
2
92°
73°
3
87°
73°
4
87°
72°
5
88°
71°
6
86°
68°
7
85°
67°
8
89°
69°
9
91°
72°
10
90°
73°
11
91°
65°
12
85°
72°
13
88°
65°
14
89°
64°
15
87°
65°
16
89°
66°
17
90°
68°
18
90°
70°
19
89°
67°
20
89°
63°
21
82°
63°
22
82°
64°
23
83°
68°
24
82°
68°
25
82°
69°
26
81°
68°
27
84°
67°
28
81°
64°
29
85°
63°
30
86°
64°
1
85°
66°
2
85°
65°
3
82°
58°
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 81° to 92°, with overnight lows between 58° and 74°. The average high for September is 87° with an average low of 68°. 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.
