S
M
T
W
T
F
S
26
81°
71°
27
79°
69°
28
78°
69°
29
78°
68°
30
78°
68°
31
79°
67°
1
81°
69°
2
80°
70°
3
78°
70°
4
77°
69°
5
78°
69°
6
80°
69°
7
81°
70°
8
81°
71°
9
80°
70°
10
79°
69°
11
79°
68°
12
76°
69°
13
77°
68°
14
78°
68°
15
77°
67°
16
78°
68°
17
77°
69°
18
78°
65°
19
77°
66°
20
78°
67°
21
78°
68°
22
80°
69°
23
80°
69°
24
79°
68°
25
80°
69°
26
80°
69°
27
79°
68°
28
80°
69°
29
79°
68°
30
80°
69°
31
80°
69°
1
79°
68°
2
80°
68°
3
77°
67°
4
77°
68°
5
76°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in National City
National City's August 2026 forecast shows daily high temperatures ranging from 76° to 81°, with overnight lows between 65° and 71°. The average high for August is 79° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in National City. See also: September | October | November.
