S
M
T
W
T
F
S
26
74°
50°
27
66°
54°
28
70°
57°
29
64°
50°
30
63°
41°
1
57°
40°
2
55°
37°
3
65°
50°
4
79°
59°
5
64°
46°
6
57°
44°
7
61°
42°
8
66°
48°
9
67°
45°
10
70°
51°
11
66°
49°
12
69°
50°
13
72°
55°
14
72°
52°
15
71°
53°
16
72°
54°
17
79°
59°
18
75°
59°
19
76°
58°
20
78°
55°
21
75°
51°
22
72°
50°
23
70°
49°
24
72°
52°
25
72°
52°
26
73°
51°
27
73°
52°
28
74°
53°
29
75°
53°
30
78°
58°
31
77°
61°
1
76°
57°
2
77°
55°
3
77°
57°
4
78°
57°
5
80°
61°
6
85°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Marengo
Marengo's May 2026 forecast shows daily high temperatures ranging from 57° to 85°, with overnight lows between 42° and 63°. The average high for May is 73° with an average low of 53°. 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 Marengo. See also: June | July | August.
