S
M
T
W
T
F
S
26
73°
55°
27
72°
52°
28
65°
50°
29
82°
59°
30
75°
61°
1
64°
54°
2
61°
41°
3
70°
36°
4
81°
43°
5
81°
57°
6
79°
63°
7
79°
54°
8
72°
46°
9
73°
50°
10
82°
55°
11
70°
52°
12
73°
45°
13
81°
43°
14
73°
46°
15
75°
41°
16
84°
48°
17
90°
64°
18
91°
70°
19
91°
66°
20
91°
66°
21
91°
68°
22
68°
61°
23
64°
60°
24
79°
67°
25
77°
69°
26
80°
69°
27
82°
68°
28
87°
65°
29
81°
65°
30
76°
59°
31
73°
58°
1
74°
59°
2
78°
61°
3
80°
62°
4
80°
63°
5
83°
62°
6
79°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lake Forest
Lake Forest's May 2026 forecast shows daily high temperatures ranging from 64° to 87°, with overnight lows between 58° and 69°. The average high for May is 78° with an average low of 63°. 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 Lake Forest. See also: June | July | August.
