S
M
T
W
T
F
S
30
100°
73°
31
100°
75°
1
100°
76°
2
101°
70°
3
104°
74°
4
101°
72°
5
99°
70°
6
97°
69°
7
99°
72°
8
101°
75°
9
101°
75°
10
100°
72°
11
102°
71°
12
102°
73°
13
99°
74°
14
96°
73°
15
97°
71°
16
95°
70°
17
97°
69°
18
93°
64°
19
90°
62°
20
86°
59°
21
88°
65°
22
89°
63°
23
86°
64°
24
85°
59°
25
89°
65°
26
88°
64°
27
87°
64°
28
82°
63°
29
87°
64°
30
87°
63°
1
86°
62°
2
87°
62°
3
85°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mertzon
Mertzon's September 2026 forecast shows daily high temperatures ranging from 82° to 102°, with overnight lows between 59° and 74°. The average high for September is 90° with an average low of 65°. 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 Mertzon. See also: October | November | December.
