S
M
T
W
T
F
S
26
66°
53°
27
67°
54°
28
75°
49°
29
78°
50°
30
76°
54°
1
80°
56°
2
79°
54°
3
65°
56°
4
68°
55°
5
68°
52°
6
76°
50°
7
82°
55°
8
81°
56°
9
84°
57°
10
85°
57°
11
91°
59°
12
71°
56°
13
75°
59°
14
76°
55°
15
73°
55°
16
74°
59°
17
72°
57°
18
82°
57°
19
88°
54°
20
92°
59°
21
84°
59°
22
77°
57°
23
78°
57°
24
78°
57°
25
78°
56°
26
69°
53°
27
69°
55°
28
71°
53°
29
74°
58°
30
81°
59°
31
82°
60°
1
84°
59°
2
83°
61°
3
82°
61°
4
84°
59°
5
83°
60°
6
81°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Winnetka
Winnetka's May 2026 forecast shows daily high temperatures ranging from 69° to 84°, with overnight lows between 53° and 61°. The average high for May is 79° 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 Winnetka. See also: June | July | August.
