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°
52°
25
79°
52°
26
86°
52°
27
86°
56°
28
79°
49°
29
63°
44°
30
75°
46°
1
78°
49°
2
77°
47°
3
71°
44°
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 63° to 86°, with overnight lows between 44° and 56°. The average high for September is 77° with an average low of 49°. 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.
