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
46°
30°
3
55°
43°
4
64°
53°
5
65°
46°
6
56°
38°
7
50°
34°
8
53°
38°
9
58°
39°
10
62°
41°
11
60°
44°
12
64°
44°
13
63°
43°
14
60°
44°
15
68°
47°
16
64°
45°
17
65°
47°
18
69°
51°
19
69°
51°
20
71°
50°
21
74°
52°
22
73°
52°
23
74°
51°
24
71°
48°
25
66°
45°
26
71°
53°
27
74°
54°
28
73°
53°
29
73°
53°
30
69°
50°
31
72°
51°
1
69°
49°
2
68°
50°
3
69°
46°
4
69°
46°
5
70°
47°
6
69°
48°
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 45° to 74°, with overnight lows between 30° and 54°. The average high for May is 65° with an average low of 46°. 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.
