S
M
T
W
T
F
S
26
61°
31°
27
63°
34°
28
57°
32°
29
44°
39°
30
46°
41°
1
60°
33°
2
48°
42°
3
45°
37°
4
55°
42°
5
56°
47°
6
60°
48°
7
55°
45°
8
55°
40°
9
56°
39°
10
57°
42°
11
59°
38°
12
60°
41°
13
59°
43°
14
60°
42°
15
60°
44°
16
61°
43°
17
60°
43°
18
59°
47°
19
60°
47°
20
64°
48°
21
65°
48°
22
67°
45°
23
62°
46°
24
61°
46°
25
63°
47°
26
64°
45°
27
64°
45°
28
63°
48°
29
63°
50°
30
65°
49°
31
65°
48°
1
66°
45°
2
64°
45°
3
65°
46°
4
65°
47°
5
66°
46°
6
66°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Prospect Harbor
Prospect Harbor's May 2026 forecast shows daily high temperatures ranging from 45° to 67°, with overnight lows between 33° and 50°. The average high for May is 61° with an average low of 44°. 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 Prospect Harbor. See also: June | July | August.
