S
M
T
W
T
F
S
28
76°
72°
29
89°
71°
30
89°
71°
1
99°
75°
2
102°
77°
3
102°
78°
4
99°
75°
5
96°
73°
6
92°
70°
7
90°
70°
8
85°
68°
9
86°
69°
10
87°
70°
11
90°
72°
12
92°
70°
13
91°
72°
14
92°
69°
15
83°
65°
16
84°
66°
17
86°
68°
18
87°
71°
19
90°
72°
20
90°
72°
21
84°
71°
22
85°
72°
23
89°
72°
24
89°
71°
25
88°
72°
26
90°
72°
27
90°
71°
28
89°
72°
29
89°
72°
30
90°
73°
31
91°
73°
1
89°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in National Harbor
National Harbor's July 2026 forecast shows daily high temperatures ranging from 83° to 102°, with overnight lows between 65° and 78°. The average high for July is 90° with an average low of 71°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in National Harbor. See also: August | September | October.
