S
M
T
W
T
F
S
26
73°
45°
27
64°
49°
28
62°
45°
29
56°
27°
30
54°
22°
1
54°
25°
2
63°
30°
3
73°
35°
4
73°
33°
5
55°
30°
6
47°
25°
7
57°
24°
8
72°
23°
9
64°
32°
10
62°
24°
11
65°
23°
12
80°
44°
13
69°
34°
14
76°
28°
15
86°
50°
16
84°
51°
17
61°
50°
18
81°
52°
19
71°
49°
20
64°
43°
21
65°
41°
22
69°
42°
23
69°
45°
24
79°
56°
25
81°
59°
26
89°
56°
27
81°
52°
28
78°
49°
29
77°
47°
30
71°
47°
31
72°
48°
1
77°
49°
2
76°
49°
3
78°
53°
4
77°
51°
5
74°
49°
6
69°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Merrillan
Merrillan's May 2026 forecast shows daily high temperatures ranging from 69° to 89°, with overnight lows between 45° and 59°. The average high for May is 77° with an average low of 51°. 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 Merrillan. See also: June | July | August.
