S
M
T
W
T
F
S
30
98°
73°
31
98°
73°
1
98°
75°
2
100°
76°
3
92°
76°
4
92°
79°
5
97°
74°
6
93°
76°
7
98°
75°
8
98°
75°
9
96°
75°
10
91°
74°
11
98°
74°
12
99°
77°
13
98°
74°
14
94°
76°
15
97°
76°
16
94°
75°
17
91°
71°
18
94°
70°
19
97°
74°
20
95°
74°
21
91°
71°
22
92°
70°
23
92°
69°
24
93°
70°
25
94°
70°
26
92°
71°
27
84°
70°
28
86°
70°
29
87°
70°
30
88°
69°
1
89°
69°
2
88°
68°
3
86°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Brenham
Brenham's September 2026 forecast shows daily high temperatures ranging from 84° to 97°, with overnight lows between 68° and 76°. The average high for September is 91° with an average low of 71°. 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 Brenham. See also: October | November | December.
