S
M
T
W
T
F
S
30
108°
82°
31
100°
80°
1
104°
79°
2
104°
75°
3
100°
72°
4
97°
78°
5
98°
75°
6
91°
77°
7
104°
76°
8
107°
85°
9
107°
85°
10
107°
84°
11
105°
79°
12
104°
74°
13
102°
73°
14
101°
73°
15
95°
69°
16
96°
72°
17
96°
68°
18
95°
68°
19
95°
68°
20
95°
67°
21
94°
66°
22
95°
67°
23
94°
65°
24
88°
65°
25
87°
63°
26
90°
65°
27
93°
66°
28
90°
65°
29
91°
67°
30
92°
68°
1
94°
68°
2
94°
67°
3
93°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Joshua Tree National Park
Joshua Tree National Park's September 2026 forecast shows daily high temperatures ranging from 87° to 107°, with overnight lows between 63° and 84°. The average high for September is 95° with an average low of 69°. 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 Joshua Tree National Park. See also: October | November | December.
