S
M
T
W
T
F
S
30
80°
68°
31
80°
68°
1
79°
67°
2
80°
67°
3
77°
66°
4
76°
67°
5
76°
66°
6
77°
65°
7
78°
66°
8
80°
67°
9
80°
67°
10
79°
68°
11
80°
67°
12
80°
66°
13
78°
67°
14
73°
65°
15
75°
63°
16
75°
65°
17
79°
65°
18
76°
62°
19
77°
64°
20
79°
63°
21
80°
63°
22
80°
64°
23
79°
64°
24
80°
61°
25
79°
61°
26
79°
57°
27
74°
55°
28
72°
56°
29
72°
59°
30
73°
64°
1
78°
65°
2
79°
60°
3
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Border
Border's September 2026 forecast shows daily high temperatures ranging from 72° to 80°, with overnight lows between 55° and 68°. The average high for September is 78° 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 Border. See also: October | November | December.
