S
M
T
W
T
F
S
30
85°
50°
31
84°
49°
1
85°
50°
2
86°
51°
3
88°
51°
4
88°
52°
5
89°
52°
6
89°
51°
7
88°
53°
8
89°
53°
9
88°
52°
10
82°
52°
11
82°
53°
12
86°
53°
13
87°
54°
14
88°
53°
15
87°
52°
16
86°
51°
17
84°
52°
18
86°
52°
19
87°
54°
20
80°
46°
21
86°
52°
22
86°
52°
23
Hist. Avg.
83°
49°
24
Hist. Avg.
83°
49°
25
Hist. Avg.
82°
49°
26
Hist. Avg.
82°
49°
27
Hist. Avg.
82°
49°
28
Hist. Avg.
82°
48°
29
Hist. Avg.
82°
48°
30
Hist. Avg.
81°
48°
1
Hist. Avg.
81°
48°
2
Hist. Avg.
81°
48°
3
Hist. Avg.
80°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Martinez
Martinez's September 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 46° and 54°. The average high for September is 86° with an average low of 52°. 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.
