S
M
T
W
T
F
S
30
86°
60°
31
87°
59°
1
88°
59°
2
91°
52°
3
92°
53°
4
96°
53°
5
94°
56°
6
92°
58°
7
91°
61°
8
87°
60°
9
83°
50°
10
91°
44°
11
94°
51°
12
81°
53°
13
98°
49°
14
89°
66°
15
75°
58°
16
79°
49°
17
78°
63°
18
87°
57°
19
81°
51°
20
75°
49°
21
78°
51°
22
86°
46°
23
N/A
24
75°
56°
25
74°
51°
26
87°
44°
27
87°
50°
28
75°
55°
29
74°
53°
30
69°
51°
1
74°
44°
2
85°
42°
3
89°
47°
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 89° to 89°, with overnight lows between 47° and 47°. The average high for September is 89° with an average low of 47°. 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.
