S
M
T
W
T
F
S
26
79°
39°
27
77°
40°
28
74°
39°
29
75°
40°
30
74°
41°
31
72°
36°
1
68°
39°
2
69°
42°
3
69°
39°
4
66°
40°
5
71°
43°
6
77°
43°
7
73°
41°
8
72°
42°
9
70°
42°
10
74°
43°
11
75°
42°
12
76°
41°
13
75°
40°
14
74°
43°
15
76°
40°
16
73°
43°
17
74°
41°
18
71°
40°
19
68°
37°
20
65°
40°
21
70°
42°
22
73°
40°
23
Hist. Avg.
71°
37°
24
Hist. Avg.
71°
37°
25
Hist. Avg.
70°
37°
26
Hist. Avg.
70°
37°
27
Hist. Avg.
70°
36°
28
Hist. Avg.
70°
36°
29
Hist. Avg.
69°
36°
30
Hist. Avg.
69°
36°
31
Hist. Avg.
69°
36°
1
Hist. Avg.
68°
35°
2
Hist. Avg.
68°
35°
3
Hist. Avg.
68°
35°
4
Hist. Avg.
67°
34°
5
Hist. Avg.
67°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Yellowstone Lake
Yellowstone Lake's August 2026 forecast shows daily high temperatures ranging from 65° to 79°, with overnight lows between 36° and 43°. The average high for August is 73° with an average low of 41°. 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.
