S
M
T
W
T
F
S
26
82°
64°
27
83°
60°
28
81°
67°
29
81°
64°
30
83°
60°
31
88°
64°
1
89°
72°
2
88°
70°
3
87°
68°
4
88°
65°
5
86°
68°
6
86°
70°
7
87°
63°
8
88°
64°
9
87°
61°
10
83°
60°
11
82°
61°
12
80°
60°
13
81°
61°
14
80°
60°
15
82°
59°
16
80°
59°
17
79°
57°
18
80°
59°
19
80°
60°
20
81°
59°
21
82°
59°
22
84°
60°
23
84°
60°
24
83°
59°
25
84°
60°
26
83°
60°
27
82°
59°
28
83°
60°
29
81°
59°
30
80°
60°
31
80°
60°
1
79°
59°
2
81°
59°
3
78°
58°
4
75°
58°
5
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lake Arrowhead
Lake Arrowhead's August 2026 forecast shows daily high temperatures ranging from 74° to 88°, with overnight lows between 56° and 70°. The average high for August is 82° with an average low of 61°. 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 Lake Arrowhead. See also: September | October | November.
