S
M
T
W
T
F
S
26
65°
52°
27
64°
49°
28
63°
50°
29
63°
50°
30
65°
51°
1
65°
49°
2
66°
48°
3
65°
49°
4
64°
47°
5
64°
47°
6
65°
48°
7
67°
53°
8
75°
53°
9
70°
56°
10
67°
51°
11
67°
49°
12
66°
48°
13
65°
50°
14
66°
49°
15
67°
51°
16
68°
50°
17
68°
56°
18
75°
54°
19
69°
51°
20
68°
52°
21
69°
58°
22
69°
59°
23
71°
61°
24
79°
62°
25
79°
62°
26
78°
61°
27
80°
63°
28
81°
63°
29
82°
61°
30
82°
62°
31
81°
58°
1
74°
56°
2
72°
60°
3
75°
63°
4
75°
63°
5
76°
64°
6
79°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Gaithersburg
Gaithersburg's May 2026 forecast shows daily high temperatures ranging from 63° to 82°, with overnight lows between 47° and 64°. The average high for May is 71° with an average low of 55°. 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 Gaithersburg. See also: June | July | August.
