S
M
T
W
T
F
S
26
58°
47°
27
59°
45°
28
60°
46°
29
56°
44°
30
52°
41°
1
53°
45°
2
53°
42°
3
52°
41°
4
52°
41°
5
51°
40°
6
53°
42°
7
55°
45°
8
58°
46°
9
59°
47°
10
58°
47°
11
60°
46°
12
59°
47°
13
59°
46°
14
60°
47°
15
60°
47°
16
55°
44°
17
56°
47°
18
59°
47°
19
60°
46°
20
55°
46°
21
54°
44°
22
55°
48°
23
55°
46°
24
54°
42°
25
54°
43°
26
58°
47°
27
62°
48°
28
62°
47°
29
57°
45°
30
55°
42°
31
56°
47°
1
55°
48°
2
59°
49°
3
63°
48°
4
63°
49°
5
64°
50°
6
64°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mendocino Headlands State Park
Mendocino Headlands State Park's May 2026 forecast shows daily high temperatures ranging from 51° to 64°, with overnight lows between 40° and 50°. The average high for May is 57° with an average low of 46°. 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 Mendocino Headlands State Park. See also: June | July | August.
