S
M
T
W
T
F
S
30
87°
55°
31
89°
54°
1
90°
58°
2
88°
56°
3
83°
55°
4
81°
57°
5
86°
58°
6
89°
58°
7
89°
56°
8
88°
56°
9
88°
51°
10
83°
49°
11
81°
49°
12
82°
46°
13
81°
48°
14
79°
51°
15
80°
50°
16
85°
53°
17
82°
55°
18
83°
56°
19
76°
55°
20
76°
54°
21
80°
54°
22
84°
53°
23
81°
53°
24
81°
52°
25
83°
53°
26
83°
50°
27
82°
48°
28
78°
49°
29
75°
52°
30
80°
52°
1
82°
53°
2
83°
51°
3
82°
49°
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 75° to 90°, with overnight lows between 46° and 58°. The average high for September is 83° with an average low of 53°. 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.
