S
M
T
W
T
F
S
30
102°
75°
31
103°
77°
1
101°
76°
2
103°
73°
3
103°
76°
4
102°
75°
5
103°
72°
6
98°
74°
7
99°
72°
8
101°
75°
9
101°
76°
10
101°
74°
11
103°
73°
12
107°
74°
13
103°
75°
14
102°
74°
15
102°
76°
16
99°
74°
17
97°
72°
18
98°
73°
19
98°
73°
20
98°
72°
21
99°
69°
22
92°
72°
23
85°
68°
24
88°
68°
25
87°
68°
26
95°
70°
27
96°
69°
28
95°
65°
29
89°
68°
30
89°
66°
1
83°
63°
2
71°
62°
3
77°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Barstow
Barstow'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 Barstow. See also: October | November | December.
