S
M
T
W
T
F
S
30
93°
74°
31
92°
75°
1
92°
75°
2
91°
76°
3
92°
75°
4
92°
75°
5
91°
74°
6
92°
75°
7
91°
76°
8
90°
75°
9
88°
75°
10
90°
74°
11
89°
75°
12
91°
76°
13
88°
75°
14
87°
75°
15
87°
74°
16
88°
75°
17
87°
75°
18
87°
74°
19
86°
71°
20
87°
70°
21
85°
72°
22
87°
74°
23
87°
74°
24
85°
72°
25
87°
73°
26
89°
72°
27
88°
72°
28
87°
71°
29
87°
71°
30
87°
71°
1
85°
70°
2
86°
68°
3
Hist. Avg.
84°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gretna
Gretna's September 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 68° and 76°. The average high for September is 89° with an average low of 74°. 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 Gretna. See also: October | November | December.
