S
M
T
W
T
F
S
26
84°
60°
27
76°
58°
28
68°
56°
29
83°
62°
30
74°
59°
1
69°
53°
2
68°
44°
3
70°
44°
4
78°
51°
5
79°
58°
6
78°
58°
7
70°
47°
8
70°
51°
9
72°
56°
10
75°
56°
11
78°
59°
12
81°
58°
13
80°
59°
14
79°
55°
15
81°
61°
16
80°
61°
17
82°
60°
18
81°
62°
19
82°
62°
20
82°
61°
21
81°
62°
22
83°
63°
23
83°
63°
24
79°
62°
25
82°
63°
26
81°
64°
27
79°
64°
28
78°
62°
29
81°
63°
30
83°
62°
31
81°
63°
1
84°
64°
2
85°
65°
3
85°
65°
4
84°
64°
5
80°
62°
6
78°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Duluth
Duluth's May 2026 forecast shows daily high temperatures ranging from 68° to 85°, with overnight lows between 44° and 65°. The average high for May is 79° with an average low of 59°. 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 Duluth. See also: June | July | August.
