S
M
T
W
T
F
S
26
59°
44°
27
61°
46°
28
69°
43°
29
78°
50°
30
82°
55°
1
84°
53°
2
78°
50°
3
72°
46°
4
65°
44°
5
66°
45°
6
71°
49°
7
75°
47°
8
74°
48°
9
73°
48°
10
76°
48°
11
77°
48°
12
72°
44°
13
67°
43°
14
68°
44°
15
68°
47°
16
67°
46°
17
68°
43°
18
67°
47°
19
67°
43°
20
69°
46°
21
72°
48°
22
76°
50°
23
77°
51°
24
79°
51°
25
78°
50°
26
75°
50°
27
73°
49°
28
71°
48°
29
71°
48°
30
72°
49°
31
71°
48°
1
72°
47°
2
73°
49°
3
75°
52°
4
78°
53°
5
77°
50°
6
75°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Clearlake
Clearlake's May 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 43° and 55°. The average high for May is 73° with an average low of 48°. 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 Clearlake. See also: June | July | August.
