S
M
T
W
T
F
S
30
89°
59°
31
82°
60°
1
78°
54°
2
83°
56°
3
83°
59°
4
81°
62°
5
84°
60°
6
86°
59°
7
89°
58°
8
97°
63°
9
101°
72°
10
105°
72°
11
96°
62°
12
92°
65°
13
81°
60°
14
87°
56°
15
90°
54°
16
83°
57°
17
78°
52°
18
85°
56°
19
88°
58°
20
84°
60°
21
83°
57°
22
84°
56°
23
90°
58°
24
96°
57°
25
88°
56°
26
85°
56°
27
82°
50°
28
85°
56°
29
91°
54°
30
91°
58°
1
87°
57°
2
92°
60°
3
91°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Modesto
Modesto's September 2026 forecast shows daily high temperatures ranging from 82° to 92°, with overnight lows between 50° and 60°. The average high for September is 88° 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 Modesto. See also: October | November | December.
