S
M
T
W
T
F
S
30
88°
66°
31
88°
66°
1
89°
65°
2
88°
64°
3
89°
64°
4
91°
65°
5
90°
67°
6
91°
67°
7
87°
65°
8
91°
66°
9
89°
66°
10
90°
65°
11
90°
65°
12
89°
63°
13
89°
64°
14
88°
63°
15
89°
64°
16
89°
65°
17
Hist. Avg.
84°
64°
18
Hist. Avg.
84°
63°
19
Hist. Avg.
83°
63°
20
Hist. Avg.
83°
62°
21
Hist. Avg.
83°
62°
22
Hist. Avg.
83°
62°
23
Hist. Avg.
82°
61°
24
Hist. Avg.
82°
61°
25
Hist. Avg.
82°
60°
26
Hist. Avg.
82°
60°
27
Hist. Avg.
81°
60°
28
Hist. Avg.
81°
59°
29
Hist. Avg.
81°
59°
30
Hist. Avg.
80°
58°
1
Hist. Avg.
80°
58°
2
Hist. Avg.
80°
58°
3
Hist. Avg.
80°
57°
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 87° to 91°, with overnight lows between 63° and 67°. The average high for September is 89° 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.
