S
M
T
W
T
F
S
30
86°
53°
31
88°
54°
1
88°
54°
2
85°
52°
3
84°
52°
4
83°
53°
5
83°
52°
6
84°
51°
7
84°
49°
8
83°
53°
9
82°
52°
10
82°
54°
11
83°
51°
12
84°
55°
13
86°
57°
14
88°
57°
15
88°
56°
16
89°
55°
17
88°
54°
18
87°
53°
19
87°
53°
20
85°
54°
21
88°
54°
22
87°
53°
23
86°
54°
24
82°
53°
25
75°
50°
26
75°
49°
27
74°
50°
28
75°
48°
29
76°
51°
30
75°
50°
1
74°
49°
2
74°
47°
3
80°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Yosemite Valley
Yosemite Valley's September 2026 forecast shows daily high temperatures ranging from 74° to 89°, with overnight lows between 47° and 57°. The average high for September is 83° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Yosemite Valley. See also: October | November | December.
