S
M
T
W
T
F
S
26
31°
13°
27
46°
16°
28
54°
20°
29
64°
19°
30
71°
25°
1
68°
29°
2
70°
31°
3
69°
36°
4
56°
37°
5
52°
28°
6
71°
28°
7
72°
38°
8
70°
39°
9
69°
45°
10
71°
42°
11
66°
37°
12
74°
28°
13
75°
42°
14
67°
43°
15
63°
38°
16
49°
32°
17
55°
28°
18
60°
26°
19
63°
29°
20
57°
37°
21
62°
31°
22
67°
46°
23
75°
35°
24
70°
43°
25
81°
40°
26
78°
45°
27
80°
57°
28
84°
53°
29
87°
54°
30
64°
43°
31
48°
41°
1
48°
40°
2
47°
39°
3
57°
41°
4
62°
42°
5
67°
42°
6
66°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Half Moon Bay
Half Moon Bay's May 2026 forecast shows daily high temperatures ranging from 47° to 67°, with overnight lows between 39° and 43°. The average high for May is 57° with an average low of 41°. 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 Half Moon Bay. See also: June | July | August.
