S
M
T
W
T
F
S
30
99°
80°
31
97°
74°
1
92°
67°
2
90°
65°
3
93°
66°
4
91°
66°
5
93°
65°
6
80°
69°
7
90°
64°
8
96°
72°
9
101°
77°
10
N/A
11
110°
79°
12
107°
73°
13
103°
71°
14
101°
67°
15
102°
69°
16
102°
72°
17
105°
73°
18
104°
74°
19
105°
72°
20
100°
67°
21
95°
68°
22
95°
66°
23
99°
65°
24
98°
63°
25
90°
60°
26
91°
61°
27
95°
62°
28
93°
60°
29
93°
64°
30
96°
66°
1
98°
66°
2
98°
65°
3
97°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Joshua Tree National Park Headquarters
Joshua Tree National Park Headquarters's September 2026 forecast shows daily high temperatures ranging from 90° to 110°, with overnight lows between 60° and 79°. The average high for September is 99° with an average low of 67°. 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 Headquarters. See also: October | November | December.
