S
M
T
W
T
F
S
26
87°
80°
27
87°
79°
28
84°
79°
29
85°
78°
30
86°
79°
31
86°
79°
1
85°
78°
2
83°
79°
3
83°
79°
4
84°
78°
5
84°
79°
6
85°
79°
7
85°
78°
8
86°
79°
9
86°
79°
10
87°
78°
11
85°
79°
12
86°
78°
13
85°
79°
14
86°
76°
15
86°
77°
16
87°
77°
17
86°
76°
18
87°
77°
19
86°
78°
20
86°
78°
21
87°
77°
22
87°
78°
23
86°
78°
24
87°
77°
25
87°
79°
26
86°
78°
27
87°
78°
28
88°
77°
29
87°
78°
30
87°
78°
31
86°
77°
1
87°
78°
2
88°
78°
3
88°
77°
4
87°
79°
5
86°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Jose
San Jose's August 2026 forecast shows daily high temperatures ranging from 83° to 88°, with overnight lows between 76° and 80°. The average high for August is 86° with an average low of 78°. 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 San Jose. See also: September | October | November.
