S
M
T
W
T
F
S
30
102°
73°
31
104°
77°
1
104°
74°
2
106°
77°
3
106°
77°
4
103°
78°
5
100°
75°
6
102°
77°
7
100°
77°
8
101°
78°
9
100°
79°
10
99°
77°
11
97°
78°
12
97°
79°
13
98°
79°
14
97°
77°
15
93°
72°
16
96°
76°
17
96°
75°
18
88°
75°
19
91°
75°
20
93°
74°
21
94°
75°
22
94°
75°
23
93°
74°
24
91°
74°
25
92°
73°
26
90°
71°
27
85°
66°
28
85°
65°
29
86°
66°
30
86°
65°
1
87°
66°
2
90°
68°
3
89°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Crystal City
Crystal City's September 2026 forecast shows daily high temperatures ranging from 85° to 106°, with overnight lows between 65° and 79°. The average high for September is 95° with an average low of 74°. 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 Crystal City. See also: October | November | December.
