S
M
T
W
T
F
S
30
96°
68°
31
97°
69°
1
96°
68°
2
97°
70°
3
94°
68°
4
93°
68°
5
91°
67°
6
88°
67°
7
88°
66°
8
89°
63°
9
88°
61°
10
88°
60°
11
86°
59°
12
87°
59°
13
87°
58°
14
85°
58°
15
86°
57°
16
86°
58°
17
85°
57°
18
86°
56°
19
85°
57°
20
86°
58°
21
85°
61°
22
86°
62°
23
88°
61°
24
84°
57°
25
Hist. Avg.
94°
65°
26
Hist. Avg.
94°
65°
27
Hist. Avg.
93°
64°
28
Hist. Avg.
93°
64°
29
Hist. Avg.
92°
64°
30
Hist. Avg.
92°
63°
1
Hist. Avg.
92°
63°
2
Hist. Avg.
91°
62°
3
Hist. Avg.
91°
62°
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 84° to 97°, with overnight lows between 56° and 70°. The average high for September is 89° with an average low of 62°. 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.
