S
M
T
W
T
F
S
30
79°
66°
31
78°
65°
1
78°
65°
2
77°
64°
3
76°
63°
4
77°
63°
5
77°
66°
6
78°
67°
7
78°
66°
8
76°
63°
9
74°
63°
10
74°
64°
11
76°
64°
12
75°
65°
13
77°
63°
14
75°
65°
15
74°
60°
16
75°
59°
17
76°
59°
18
74°
60°
19
73°
61°
20
76°
62°
21
73°
58°
22
73°
56°
23
74°
56°
24
73°
57°
25
73°
59°
26
74°
59°
27
75°
56°
28
74°
55°
29
72°
57°
30
72°
61°
1
76°
62°
2
79°
62°
3
79°
63°
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 79°, with overnight lows between 55° and 67°. The average high for September is 75° with an average low of 62°. 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.
