S
M
T
W
T
F
S
30
93°
64°
31
94°
64°
1
95°
65°
2
95°
64°
3
90°
64°
4
91°
63°
5
91°
63°
6
92°
64°
7
89°
64°
8
86°
63°
9
88°
63°
10
88°
62°
11
89°
63°
12
89°
62°
13
91°
60°
14
89°
60°
15
90°
62°
16
90°
61°
17
87°
62°
18
84°
60°
19
91°
62°
20
91°
63°
21
85°
55°
22
84°
57°
23
86°
58°
24
88°
60°
25
88°
58°
26
89°
56°
27
89°
52°
28
82°
52°
29
80°
53°
30
81°
54°
1
84°
53°
2
86°
57°
3
86°
60°
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 80° to 95°, with overnight lows between 52° and 65°. The average high for September is 88° with an average low of 60°. 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.
