S
M
T
W
T
F
S
26
58°
44°
27
71°
38°
28
69°
45°
29
67°
52°
30
74°
49°
1
71°
38°
2
63°
48°
3
65°
38°
4
80°
46°
5
86°
63°
6
73°
63°
7
62°
48°
8
75°
39°
9
78°
55°
10
87°
49°
11
62°
46°
12
75°
41°
13
80°
56°
14
66°
51°
15
75°
44°
16
88°
47°
17
91°
59°
18
98°
63°
19
100°
70°
20
99°
67°
21
75°
57°
22
59°
52°
23
60°
57°
24
71°
63°
25
77°
66°
26
74°
67°
27
78°
65°
28
83°
59°
29
79°
55°
30
73°
50°
31
74°
56°
1
77°
57°
2
79°
59°
3
80°
60°
4
79°
59°
5
82°
60°
6
76°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Potomac
Potomac's May 2026 forecast shows daily high temperatures ranging from 60° to 83°, with overnight lows between 50° and 67°. The average high for May is 76° 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 Potomac. See also: June | July | August.
