S
M
T
W
T
F
S
26
59°
37°
27
63°
36°
28
67°
42°
29
70°
41°
30
73°
44°
1
76°
48°
2
81°
49°
3
82°
50°
4
81°
49°
5
78°
51°
6
77°
48°
7
76°
49°
8
77°
50°
9
75°
49°
10
74°
48°
11
72°
43°
12
67°
42°
13
72°
43°
14
77°
48°
15
79°
50°
16
80°
50°
17
77°
45°
18
77°
50°
19
79°
50°
20
80°
51°
21
79°
52°
22
70°
49°
23
72°
48°
24
77°
51°
25
81°
52°
26
83°
54°
27
83°
54°
28
75°
48°
29
81°
53°
30
82°
54°
31
78°
53°
1
76°
50°
2
81°
54°
3
83°
55°
4
83°
55°
5
77°
54°
6
82°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Nampa
Nampa's May 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 41° and 55°. The average high for May is 77° with an average low of 50°. 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 Nampa. See also: June | July | August.
