S
M
T
W
T
F
S
30
85°
67°
31
81°
66°
1
81°
63°
2
79°
61°
3
79°
56°
4
79°
61°
5
91°
59°
6
93°
73°
7
98°
74°
8
98°
75°
9
100°
77°
10
95°
74°
11
91°
70°
12
83°
66°
13
80°
66°
14
79°
62°
15
80°
64°
16
77°
67°
17
77°
66°
18
78°
67°
19
79°
62°
20
80°
66°
21
78°
67°
22
79°
64°
23
81°
66°
24
80°
66°
25
83°
65°
26
85°
67°
27
81°
65°
28
83°
65°
29
82°
68°
30
87°
64°
1
82°
64°
2
85°
65°
3
83°
65°
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 80° to 87°, with overnight lows between 64° and 68°. The average high for September is 83° 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 Border. See also: October | November | December.
