S
M
T
W
T
F
S
26
64°
54°
27
65°
52°
28
71°
49°
29
72°
50°
30
71°
54°
1
74°
57°
2
73°
57°
3
65°
56°
4
67°
55°
5
66°
53°
6
72°
52°
7
77°
54°
8
75°
59°
9
79°
59°
10
77°
58°
11
78°
57°
12
68°
59°
13
73°
57°
14
71°
56°
15
70°
59°
16
70°
60°
17
67°
59°
18
72°
57°
19
84°
56°
20
84°
57°
21
79°
57°
22
76°
56°
23
76°
56°
24
78°
56°
25
76°
56°
26
73°
57°
27
74°
56°
28
79°
56°
29
78°
59°
30
78°
57°
31
80°
59°
1
80°
58°
2
79°
57°
3
77°
55°
4
75°
54°
5
79°
59°
6
82°
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 73° to 84°, with overnight lows between 54° and 59°. The average high for May is 78° with an average low of 57°. 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.
