S
M
T
W
T
F
S
26
84°
68°
27
87°
73°
28
86°
73°
29
87°
72°
30
79°
71°
1
72°
58°
2
73°
55°
3
78°
56°
4
79°
59°
5
82°
59°
6
84°
73°
7
78°
72°
8
80°
68°
9
74°
66°
10
83°
67°
11
81°
69°
12
84°
67°
13
87°
71°
14
90°
71°
15
88°
72°
16
87°
72°
17
86°
74°
18
87°
76°
19
88°
75°
20
86°
74°
21
86°
75°
22
86°
74°
23
87°
76°
24
84°
77°
25
85°
76°
26
84°
75°
27
87°
74°
28
85°
73°
29
86°
75°
30
85°
73°
31
88°
74°
1
89°
72°
2
88°
74°
3
86°
75°
4
86°
75°
5
85°
74°
6
85°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Gretna
Gretna's May 2026 forecast shows daily high temperatures ranging from 84° to 89°, with overnight lows between 72° and 77°. The average high for May is 86° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Gretna. See also: June | July | August.
