S
M
T
W
T
F
S
26
40°
19°
27
41°
21°
28
51°
26°
29
50°
26°
30
57°
33°
1
67°
36°
2
59°
31°
3
60°
34°
4
51°
30°
5
50°
33°
6
52°
32°
7
57°
33°
8
59°
35°
9
56°
35°
10
65°
38°
11
58°
41°
12
59°
33°
13
59°
38°
14
67°
45°
15
71°
46°
16
73°
47°
17
74°
46°
18
62°
41°
19
64°
46°
20
66°
46°
21
72°
49°
22
73°
48°
23
72°
47°
24
66°
45°
25
73°
48°
26
75°
50°
27
76°
50°
28
77°
49°
29
67°
48°
30
74°
51°
31
75°
52°
1
76°
51°
2
75°
50°
3
71°
50°
4
73°
51°
5
73°
52°
6
72°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Neptune
Neptune's May 2026 forecast shows daily high temperatures ranging from 41° to 77°, with overnight lows between 21° and 52°. The average high for May is 65° with an average low of 42°. 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 Neptune. See also: June | July | August.
