S
M
T
W
T
F
S
26
56°
41°
27
70°
36°
28
63°
44°
29
62°
50°
30
71°
47°
1
67°
40°
2
62°
49°
3
63°
43°
4
78°
58°
5
86°
63°
6
79°
57°
7
59°
45°
8
66°
49°
9
69°
51°
10
67°
52°
11
71°
51°
12
69°
52°
13
70°
54°
14
72°
54°
15
72°
52°
16
75°
53°
17
76°
54°
18
78°
59°
19
77°
59°
20
78°
58°
21
78°
59°
22
76°
51°
23
70°
51°
24
70°
52°
25
71°
54°
26
73°
54°
27
71°
53°
28
72°
55°
29
73°
53°
30
72°
58°
31
75°
62°
1
79°
61°
2
74°
58°
3
75°
60°
4
79°
63°
5
80°
63°
6
82°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Upper Marlboro
Upper Marlboro's May 2026 forecast shows daily high temperatures ranging from 59° to 86°, with overnight lows between 45° and 63°. The average high for May is 74° with an average low of 56°. 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 Upper Marlboro. See also: June | July | August.
