S
M
T
W
T
F
S
26
102°
73°
27
102°
73°
28
99°
69°
29
99°
65°
30
99°
64°
31
106°
68°
1
104°
72°
2
104°
72°
3
100°
69°
4
99°
68°
5
97°
67°
6
100°
69°
7
100°
73°
8
104°
73°
9
102°
73°
10
99°
72°
11
99°
73°
12
93°
70°
13
90°
67°
14
91°
64°
15
93°
64°
16
97°
66°
17
100°
69°
18
100°
68°
19
106°
70°
20
104°
73°
21
104°
75°
22
104°
72°
23
106°
72°
24
106°
73°
25
104°
75°
26
109°
74°
27
102°
82°
28
106°
79°
29
102°
77°
30
99°
73°
31
93°
68°
1
91°
63°
2
90°
59°
3
88°
61°
4
88°
61°
5
95°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Bernardino
San Bernardino's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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 Bernardino. See also: September | October | November.
