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
97°
73°
9
94°
72°
10
95°
73°
11
97°
75°
12
102°
73°
13
99°
71°
14
96°
71°
15
95°
69°
16
92°
66°
17
91°
64°
18
88°
64°
19
86°
62°
20
83°
61°
21
85°
60°
22
86°
64°
23
81°
64°
24
79°
63°
25
79°
64°
26
80°
63°
27
79°
63°
28
80°
62°
29
79°
63°
30
82°
53°
1
76°
51°
2
77°
51°
3
76°
52°
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 76° to 102°, with overnight lows between 51° and 75°. The average high for September is 87° with an average low of 64°. 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.
