S
M
T
W
T
F
S
30
83°
57°
31
77°
57°
1
77°
58°
2
76°
57°
3
76°
62°
4
77°
56°
5
81°
56°
6
76°
55°
7
75°
54°
8
76°
55°
9
76°
54°
10
78°
60°
11
79°
61°
12
74°
59°
13
73°
60°
14
72°
52°
15
71°
51°
16
Hist. Avg.
75°
55°
17
Hist. Avg.
74°
54°
18
Hist. Avg.
74°
54°
19
Hist. Avg.
74°
54°
20
Hist. Avg.
73°
53°
21
Hist. Avg.
73°
53°
22
Hist. Avg.
72°
53°
23
Hist. Avg.
72°
52°
24
Hist. Avg.
72°
52°
25
Hist. Avg.
71°
52°
26
Hist. Avg.
71°
51°
27
Hist. Avg.
70°
51°
28
Hist. Avg.
70°
50°
29
Hist. Avg.
70°
50°
30
Hist. Avg.
69°
50°
1
Hist. Avg.
69°
49°
2
Hist. Avg.
68°
49°
3
Hist. Avg.
68°
48°
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 71° to 83°, with overnight lows between 51° and 62°. The average high for September is 76° with an average low of 57°. 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.
