S
M
T
W
T
F
S
30
94°
71°
31
97°
72°
1
95°
71°
2
99°
73°
3
100°
75°
4
91°
75°
5
97°
70°
6
93°
72°
7
95°
73°
8
97°
73°
9
96°
72°
10
95°
71°
11
96°
73°
12
99°
73°
13
100°
72°
14
98°
72°
15
97°
68°
16
92°
67°
17
93°
65°
18
91°
67°
19
89°
62°
20
86°
62°
21
88°
62°
22
90°
67°
23
90°
67°
24
81°
66°
25
82°
66°
26
85°
65°
27
83°
65°
28
84°
66°
29
85°
66°
30
85°
58°
1
79°
55°
2
80°
54°
3
79°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mason
Mason's September 2026 forecast shows daily high temperatures ranging from 79° to 100°, with overnight lows between 53° and 73°. The average high for September is 89° with an average low of 66°. 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 Mason. See also: October | November | December.
