S
M
T
W
T
F
S
30
89°
77°
31
89°
78°
1
90°
79°
2
91°
78°
3
91°
78°
4
90°
77°
5
91°
77°
6
90°
76°
7
90°
77°
8
89°
77°
9
91°
76°
10
90°
77°
11
89°
76°
12
89°
76°
13
90°
77°
14
91°
78°
15
90°
77°
16
89°
76°
17
90°
77°
18
91°
78°
19
90°
78°
20
90°
77°
21
89°
78°
22
91°
78°
23
90°
77°
24
90°
78°
25
89°
78°
26
90°
77°
27
90°
78°
28
89°
77°
29
90°
77°
30
89°
76°
1
90°
77°
2
89°
76°
3
88°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Middle River
South Middle River's September 2026 forecast shows daily high temperatures ranging from 88° to 91°, with overnight lows between 73° and 79°. The average high for September is 90° with an average low of 77°. 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 South Middle River. See also: October | November | December.
