S
M
T
W
T
F
S
30
89°
69°
31
89°
68°
1
90°
67°
2
89°
67°
3
89°
65°
4
88°
64°
5
88°
63°
6
87°
62°
7
87°
64°
8
88°
65°
9
88°
65°
10
87°
64°
11
87°
66°
12
85°
63°
13
84°
66°
14
85°
68°
15
Hist. Avg.
103°
73°
16
Hist. Avg.
103°
73°
17
Hist. Avg.
102°
72°
18
Hist. Avg.
102°
72°
19
Hist. Avg.
102°
71°
20
Hist. Avg.
101°
71°
21
Hist. Avg.
101°
71°
22
Hist. Avg.
100°
70°
23
Hist. Avg.
100°
70°
24
Hist. Avg.
100°
69°
25
Hist. Avg.
99°
69°
26
Hist. Avg.
99°
69°
27
Hist. Avg.
98°
68°
28
Hist. Avg.
98°
68°
29
Hist. Avg.
98°
67°
30
Hist. Avg.
97°
67°
1
Hist. Avg.
96°
67°
2
Hist. Avg.
96°
66°
3
Hist. Avg.
96°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Barnwell
Barnwell's September 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 62° and 69°. The average high for September is 88° 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 Barnwell. See also: October | November | December.
