S
M
T
W
T
F
S
30
96°
76°
31
95°
76°
1
95°
75°
2
94°
75°
3
93°
74°
4
94°
74°
5
94°
73°
6
93°
74°
7
94°
74°
8
94°
73°
9
93°
74°
10
93°
72°
11
91°
71°
12
92°
71°
13
93°
73°
14
96°
70°
15
93°
69°
16
91°
68°
17
92°
67°
18
90°
69°
19
92°
71°
20
91°
70°
21
91°
69°
22
89°
63°
23
85°
63°
24
84°
62°
25
83°
63°
26
84°
64°
27
88°
67°
28
91°
67°
29
90°
64°
30
90°
64°
1
91°
67°
2
89°
58°
3
89°
59°
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 83° to 96°, with overnight lows between 58° and 76°. The average high for September is 91° with an average low of 69°. 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.
