S
M
T
W
T
F
S
30
96°
66°
31
98°
69°
1
101°
70°
2
101°
71°
3
100°
71°
4
101°
70°
5
101°
70°
6
98°
69°
7
94°
66°
8
93°
63°
9
93°
64°
10
91°
66°
11
90°
64°
12
91°
69°
13
92°
68°
14
91°
63°
15
91°
60°
16
96°
60°
17
94°
64°
18
94°
63°
19
Hist. Avg.
95°
65°
20
Hist. Avg.
94°
64°
21
Hist. Avg.
94°
64°
22
Hist. Avg.
94°
64°
23
Hist. Avg.
93°
63°
24
Hist. Avg.
93°
63°
25
Hist. Avg.
92°
63°
26
Hist. Avg.
92°
62°
27
Hist. Avg.
92°
62°
28
Hist. Avg.
91°
62°
29
Hist. Avg.
91°
61°
30
Hist. Avg.
90°
61°
1
Hist. Avg.
90°
60°
2
Hist. Avg.
90°
60°
3
Hist. Avg.
89°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Barstow
Barstow's September 2026 forecast shows daily high temperatures ranging from 90° to 101°, with overnight lows between 60° and 71°. The average high for September is 95° with an average low of 66°. 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 Barstow. See also: October | November | December.
