S
M
T
W
T
F
S
30
92°
76°
31
89°
70°
1
85°
71°
2
85°
65°
3
83°
64°
4
84°
60°
5
88°
64°
6
79°
67°
7
83°
68°
8
91°
72°
9
95°
77°
10
99°
80°
11
94°
77°
12
92°
72°
13
91°
74°
14
92°
67°
15
84°
67°
16
84°
64°
17
82°
67°
18
86°
60°
19
88°
59°
20
88°
62°
21
84°
64°
22
N/A
23
88°
62°
24
83°
66°
25
87°
65°
26
88°
65°
27
82°
72°
28
76°
62°
29
76°
60°
30
88°
62°
1
89°
67°
2
89°
65°
3
87°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Joshua Tree
Joshua Tree's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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. See also: October | November | December.
