S
M
T
W
T
F
S
30
101°
77°
31
99°
73°
1
99°
68°
2
99°
77°
3
95°
76°
4
98°
74°
5
99°
71°
6
101°
71°
7
101°
75°
8
101°
75°
9
101°
79°
10
86°
68°
11
93°
65°
12
96°
74°
13
97°
72°
14
98°
76°
15
99°
79°
16
99°
77°
17
99°
70°
18
98°
71°
19
98°
72°
20
89°
72°
21
82°
64°
22
86°
63°
23
87°
58°
24
91°
65°
25
88°
69°
26
88°
65°
27
90°
67°
28
87°
65°
29
82°
71°
30
86°
73°
1
75°
67°
2
77°
63°
3
74°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Stillwater
Stillwater's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Stillwater. See also: October | November | December.
