S
M
T
W
T
F
S
30
86°
71°
31
93°
70°
1
99°
73°
2
99°
72°
3
97°
72°
4
97°
72°
5
97°
72°
6
93°
68°
7
90°
70°
8
90°
64°
9
91°
63°
10
N/A
11
92°
71°
12
88°
71°
13
91°
71°
14
94°
69°
15
89°
65°
16
90°
64°
17
91°
68°
18
88°
67°
19
84°
62°
20
81°
57°
21
78°
60°
22
80°
59°
23
82°
61°
24
83°
60°
25
84°
61°
26
82°
59°
27
82°
62°
28
85°
63°
29
85°
63°
30
84°
62°
1
84°
63°
2
83°
61°
3
84°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Hartsville
Hartsville's September 2026 forecast shows daily high temperatures ranging from 78° to 94°, with overnight lows between 57° and 71°. The average high for September is 85° with an average low of 63°. 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 Hartsville. See also: October | November | December.
