S
M
T
W
T
F
S
30
101°
80°
31
100°
80°
1
100°
80°
2
100°
80°
3
95°
77°
4
99°
79°
5
99°
78°
6
100°
79°
7
102°
79°
8
103°
78°
9
101°
79°
10
100°
77°
11
100°
80°
12
104°
78°
13
102°
73°
14
95°
72°
15
92°
71°
16
93°
70°
17
92°
72°
18
91°
69°
19
90°
66°
20
88°
64°
21
92°
70°
22
92°
69°
23
91°
69°
24
89°
68°
25
83°
68°
26
87°
67°
27
87°
67°
28
89°
66°
29
88°
67°
30
86°
59°
1
78°
55°
2
77°
56°
3
77°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Justin
Justin's September 2026 forecast shows daily high temperatures ranging from 77° to 104°, with overnight lows between 55° and 80°. The average high for September is 91° with an average low of 69°. 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 Justin. See also: October | November | December.
