S
M
T
W
T
F
S
30
93°
70°
31
90°
67°
1
90°
68°
2
91°
69°
3
92°
71°
4
94°
65°
5
92°
65°
6
87°
66°
7
88°
66°
8
92°
70°
9
94°
66°
10
87°
64°
11
89°
65°
12
89°
62°
13
86°
61°
14
85°
60°
15
84°
61°
16
85°
62°
17
88°
61°
18
90°
62°
19
92°
59°
20
91°
58°
21
Hist. Avg.
86°
60°
22
Hist. Avg.
86°
60°
23
Hist. Avg.
85°
59°
24
Hist. Avg.
85°
59°
25
Hist. Avg.
84°
58°
26
Hist. Avg.
84°
58°
27
Hist. Avg.
84°
57°
28
Hist. Avg.
83°
57°
29
Hist. Avg.
83°
56°
30
Hist. Avg.
83°
56°
1
Hist. Avg.
82°
56°
2
Hist. Avg.
82°
55°
3
Hist. Avg.
82°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Frederick
Frederick's September 2026 forecast shows daily high temperatures ranging from 84° to 94°, with overnight lows between 58° and 71°. The average high for September is 90° with an average low of 64°. 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 Frederick. See also: October | November | December.
