S
M
T
W
T
F
S
26
86°
65°
27
85°
64°
28
84°
65°
29
85°
65°
30
86°
64°
31
82°
63°
1
79°
59°
2
79°
60°
3
80°
63°
4
80°
62°
5
82°
63°
6
85°
64°
7
86°
65°
8
83°
65°
9
85°
64°
10
85°
63°
11
84°
64°
12
86°
64°
13
85°
65°
14
87°
55°
15
83°
56°
16
82°
57°
17
79°
56°
18
85°
56°
19
86°
54°
20
78°
52°
21
77°
54°
22
77°
54°
23
76°
55°
24
78°
55°
25
81°
59°
26
77°
58°
27
84°
55°
28
85°
52°
29
77°
52°
30
75°
53°
31
75°
52°
1
76°
51°
2
74°
50°
3
75°
50°
4
75°
51°
5
76°
55°
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 74° to 87°, with overnight lows between 50° and 65°. The average high for August is 81° with an average low of 58°. 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.
