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
80°
61°
24
80°
64°
25
84°
65°
26
87°
62°
27
78°
69°
28
81°
59°
29
80°
56°
30
81°
62°
1
80°
62°
2
105°
61°
3
103°
72°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
