S
M
T
W
T
F
S
26
57°
48°
27
72°
40°
28
69°
51°
29
67°
56°
30
60°
41°
1
68°
34°
2
55°
40°
3
61°
34°
4
77°
42°
5
83°
45°
6
71°
54°
7
67°
47°
8
71°
34°
9
72°
47°
10
79°
44°
11
67°
41°
12
77°
32°
13
74°
41°
14
56°
44°
15
72°
40°
16
84°
41°
17
89°
57°
18
92°
54°
19
94°
58°
20
92°
60°
21
67°
53°
22
56°
53°
23
56°
49°
24
67°
52°
25
76°
58°
26
69°
64°
27
71°
57°
28
70°
45°
29
73°
52°
30
69°
41°
31
69°
43°
1
65°
42°
2
66°
45°
3
70°
48°
4
72°
49°
5
74°
53°
6
76°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Bismarck
Bismarck's May 2026 forecast shows daily high temperatures ranging from 65° to 76°, with overnight lows between 41° and 64°. 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 Bismarck. See also: June | July | August.
