S
M
T
W
T
F
S
31
76°
53°
1
80°
60°
2
77°
55°
3
84°
57°
4
91°
60°
5
95°
67°
6
96°
70°
7
90°
70°
8
84°
59°
9
82°
58°
10
82°
62°
11
89°
65°
12
93°
68°
13
91°
70°
14
91°
68°
15
88°
66°
16
89°
69°
17
87°
64°
18
84°
67°
19
88°
68°
20
86°
69°
21
88°
67°
22
86°
63°
23
82°
64°
24
84°
68°
25
89°
70°
26
90°
70°
27
89°
67°
28
83°
66°
29
85°
68°
30
83°
65°
1
85°
66°
2
84°
65°
3
87°
67°
4
90°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in National Harbor
National Harbor's June 2026 forecast shows daily high temperatures ranging from 82° to 96°, with overnight lows between 58° and 71°. The average high for June is 87° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in National Harbor. See also: July | August | September.
