S
M
T
W
T
F
S
26
87°
63°
27
86°
64°
28
89°
63°
29
89°
64°
30
88°
63°
31
90°
64°
1
90°
65°
2
87°
62°
3
85°
59°
4
Hist. Avg.
88°
61°
5
Hist. Avg.
88°
61°
6
Hist. Avg.
88°
61°
7
Hist. Avg.
88°
61°
8
Hist. Avg.
88°
61°
9
Hist. Avg.
88°
61°
10
Hist. Avg.
89°
61°
11
Hist. Avg.
89°
61°
12
Hist. Avg.
89°
61°
13
Hist. Avg.
89°
61°
14
Hist. Avg.
90°
61°
15
Hist. Avg.
90°
61°
16
Hist. Avg.
90°
61°
17
Hist. Avg.
90°
62°
18
Hist. Avg.
90°
62°
19
Hist. Avg.
90°
62°
20
Hist. Avg.
91°
62°
21
Hist. Avg.
91°
62°
22
Hist. Avg.
91°
62°
23
Hist. Avg.
91°
62°
24
Hist. Avg.
91°
62°
25
Hist. Avg.
91°
62°
26
Hist. Avg.
91°
62°
27
Hist. Avg.
91°
62°
28
Hist. Avg.
92°
62°
29
Hist. Avg.
92°
62°
30
Hist. Avg.
92°
62°
31
Hist. Avg.
92°
62°
1
Hist. Avg.
92°
62°
2
Hist. Avg.
91°
62°
3
Hist. Avg.
91°
62°
4
Hist. Avg.
91°
62°
5
Hist. Avg.
91°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Fallbrook
Fallbrook's August 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 59° and 65°. The average high for August is 88° with an average low of 63°. 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 Fallbrook. See also: September | October | November.
