S
M
T
W
T
F
S
26
75°
44°
27
76°
45°
28
74°
44°
29
76°
45°
30
77°
45°
31
77°
44°
1
75°
40°
2
68°
39°
3
75°
44°
4
76°
44°
5
75°
45°
6
76°
43°
7
68°
41°
8
73°
43°
9
74°
43°
10
75°
42°
11
75°
43°
12
72°
43°
13
69°
42°
14
71°
42°
15
70°
41°
16
71°
39°
17
70°
42°
18
69°
41°
19
72°
42°
20
69°
40°
21
75°
41°
22
77°
38°
23
74°
38°
24
70°
32°
25
64°
31°
26
63°
34°
27
63°
32°
28
62°
32°
29
63°
38°
30
67°
32°
31
68°
31°
1
62°
38°
2
70°
36°
3
68°
37°
4
61°
37°
5
65°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Yellowstone Lake
Yellowstone Lake's August 2026 forecast shows daily high temperatures ranging from 61° to 77°, with overnight lows between 31° and 45°. The average high for August is 71° with an average low of 40°. 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 Yellowstone Lake. See also: September | October | November.
