S
M
T
W
T
F
S
26
83°
56°
27
78°
57°
28
77°
63°
29
77°
58°
30
77°
50°
1
69°
51°
2
70°
46°
3
68°
50°
4
71°
52°
5
75°
57°
6
77°
58°
7
78°
53°
8
72°
57°
9
72°
56°
10
73°
55°
11
75°
58°
12
73°
59°
13
79°
59°
14
74°
58°
15
74°
53°
16
73°
52°
17
72°
52°
18
74°
53°
19
79°
60°
20
77°
60°
21
76°
58°
22
75°
58°
23
76°
61°
24
75°
62°
25
76°
62°
26
78°
61°
27
76°
62°
28
75°
63°
29
76°
63°
30
77°
62°
31
77°
59°
1
78°
59°
2
77°
60°
3
78°
59°
4
78°
60°
5
83°
61°
6
86°
63°
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 68° to 86°, with overnight lows between 46° and 63°. The average high for May is 76° with an average low of 58°. 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.
