S
M
T
W
T
F
S
26
87°
66°
27
87°
67°
28
88°
67°
29
82°
66°
30
87°
67°
31
88°
67°
1
87°
66°
2
88°
67°
3
88°
68°
4
89°
67°
5
88°
67°
6
86°
66°
7
86°
67°
8
84°
65°
9
81°
61°
10
81°
60°
11
82°
61°
12
81°
66°
13
83°
66°
14
83°
65°
15
86°
66°
16
86°
64°
17
87°
60°
18
85°
61°
19
86°
63°
20
85°
64°
21
87°
65°
22
88°
64°
23
88°
64°
24
86°
63°
25
84°
62°
26
80°
60°
27
80°
61°
28
81°
60°
29
78°
61°
30
79°
57°
31
79°
60°
1
83°
60°
2
84°
62°
3
84°
62°
4
83°
55°
5
78°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Gretna
Gretna's August 2026 forecast shows daily high temperatures ranging from 78° to 89°, with overnight lows between 54° and 68°. The average high for August is 84° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Gretna. See also: September | October | November.
