S
M
T
W
T
F
S
26
57°
40°
27
68°
46°
28
64°
51°
29
56°
39°
30
54°
36°
1
49°
33°
2
56°
30°
3
69°
46°
4
81°
44°
5
61°
48°
6
57°
38°
7
58°
36°
8
65°
36°
9
74°
45°
10
65°
39°
11
53°
38°
12
69°
37°
13
58°
40°
14
65°
38°
15
74°
61°
16
82°
63°
17
80°
70°
18
78°
70°
19
77°
52°
20
62°
46°
21
65°
50°
22
70°
54°
23
77°
54°
24
70°
57°
25
73°
59°
26
71°
60°
27
71°
60°
28
73°
52°
29
71°
56°
30
66°
53°
31
66°
50°
1
67°
48°
2
66°
48°
3
67°
50°
4
70°
58°
5
77°
60°
6
78°
60°
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 62° to 82°, with overnight lows between 46° and 70°. The average high for May is 72° with an average low of 56°. 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.
