S
M
T
W
T
F
S
30
92°
74°
31
93°
75°
1
90°
73°
2
91°
73°
3
91°
73°
4
90°
71°
5
91°
70°
6
91°
71°
7
89°
69°
8
91°
70°
9
90°
69°
10
91°
70°
11
90°
70°
12
86°
69°
13
86°
68°
14
90°
71°
15
90°
71°
16
89°
70°
17
86°
70°
18
86°
69°
19
87°
70°
20
87°
69°
21
86°
69°
22
85°
68°
23
85°
69°
24
84°
68°
25
85°
69°
26
85°
67°
27
84°
68°
28
85°
68°
29
86°
67°
30
85°
68°
1
84°
67°
2
84°
67°
3
83°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Morriston
Morriston's September 2026 forecast shows daily high temperatures ranging from 83° to 91°, with overnight lows between 66° and 73°. The average high for September is 87° 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 Morriston. See also: October | November | December.
