S
M
T
W
T
F
S
26
75°
57°
27
76°
57°
28
77°
53°
29
75°
54°
30
76°
55°
31
76°
58°
1
75°
57°
2
77°
58°
3
78°
59°
4
78°
58°
5
77°
58°
6
78°
57°
7
77°
56°
8
76°
57°
9
77°
57°
10
72°
52°
11
74°
48°
12
67°
52°
13
70°
54°
14
76°
48°
15
73°
51°
16
72°
49°
17
72°
52°
18
75°
53°
19
74°
50°
20
72°
49°
21
74°
50°
22
74°
50°
23
73°
54°
24
71°
46°
25
65°
45°
26
64°
45°
27
63°
46°
28
63°
44°
29
64°
44°
30
64°
46°
31
63°
48°
1
67°
51°
2
69°
48°
3
70°
50°
4
68°
43°
5
61°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Yellowstone
Yellowstone's August 2026 forecast shows daily high temperatures ranging from 61° to 78°, with overnight lows between 40° and 59°. The average high for August is 72° with an average low of 51°. 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. See also: September | October | November.
