S
M
T
W
T
F
S
26
82°
51°
27
81°
51°
28
81°
51°
29
80°
57°
30
78°
57°
31
81°
53°
1
82°
58°
2
86°
58°
3
82°
55°
4
77°
56°
5
77°
57°
6
78°
51°
7
75°
54°
8
73°
55°
9
86°
56°
10
74°
56°
11
77°
55°
12
77°
58°
13
74°
57°
14
74°
56°
15
78°
57°
16
75°
56°
17
79°
56°
18
79°
55°
19
78°
55°
20
82°
56°
21
81°
55°
22
80°
54°
23
78°
56°
24
76°
54°
25
78°
54°
26
80°
56°
27
82°
57°
28
82°
57°
29
79°
55°
30
82°
56°
31
83°
56°
1
84°
55°
2
83°
56°
3
77°
56°
4
78°
55°
5
81°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Napa Junction
Napa Junction's August 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 54° and 58°. The average high for August is 79° with an average low of 56°. 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 Napa Junction. See also: September | October | November.
