S
M
T
W
T
F
S
26
63°
43°
27
75°
38°
28
74°
52°
29
57°
45°
30
52°
35°
1
45°
33°
2
43°
35°
3
60°
27°
4
73°
47°
5
72°
53°
6
56°
45°
7
59°
33°
8
60°
38°
9
66°
48°
10
59°
40°
11
53°
32°
12
55°
45°
13
59°
44°
14
57°
42°
15
64°
44°
16
69°
49°
17
70°
53°
18
75°
50°
19
72°
51°
20
73°
50°
21
72°
52°
22
75°
46°
23
75°
51°
24
73°
50°
25
76°
52°
26
77°
54°
27
77°
54°
28
76°
53°
29
78°
55°
30
77°
55°
31
78°
52°
1
69°
48°
2
69°
48°
3
70°
54°
4
76°
55°
5
73°
55°
6
74°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mercer
Mercer's May 2026 forecast shows daily high temperatures ranging from 53° to 78°, with overnight lows between 32° and 55°. The average high for May is 70° with an average low of 49°. 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 Mercer. See also: June | July | August.
