S
M
T
W
T
F
S
30
92°
71°
31
91°
70°
1
92°
69°
2
91°
68°
3
91°
66°
4
90°
66°
5
90°
67°
6
91°
66°
7
90°
67°
8
92°
70°
9
89°
70°
10
93°
69°
11
92°
70°
12
93°
71°
13
94°
70°
14
94°
70°
15
93°
69°
16
91°
69°
17
92°
70°
18
92°
68°
19
91°
67°
20
91°
66°
21
90°
67°
22
92°
62°
23
91°
65°
24
91°
67°
25
Hist. Avg.
88°
65°
26
Hist. Avg.
88°
64°
27
Hist. Avg.
87°
64°
28
Hist. Avg.
87°
64°
29
Hist. Avg.
87°
63°
30
Hist. Avg.
86°
63°
1
Hist. Avg.
86°
63°
2
Hist. Avg.
86°
62°
3
Hist. Avg.
86°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Round Top
Round Top's September 2026 forecast shows daily high temperatures ranging from 89° to 94°, with overnight lows between 62° and 71°. The average high for September is 92° with an average low of 68°. 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 Round Top. See also: October | November | December.
