S
M
T
W
T
F
S
30
90°
66°
31
N/A
1
95°
73°
2
93°
73°
3
97°
74°
4
92°
67°
5
85°
64°
6
83°
62°
7
82°
63°
8
81°
62°
9
86°
64°
10
83°
63°
11
84°
59°
12
77°
60°
13
76°
60°
14
81°
64°
15
77°
64°
16
75°
63°
17
75°
59°
18
74°
55°
19
73°
55°
20
73°
58°
21
77°
59°
22
79°
61°
23
81°
62°
24
81°
61°
25
79°
60°
26
78°
60°
27
79°
61°
28
78°
60°
29
79°
59°
30
74°
57°
1
70°
53°
2
71°
57°
3
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Greenbelt
Greenbelt's September 2026 forecast shows daily high temperatures ranging from 70° to 97°, with overnight lows between 53° and 74°. The average high for September is 80° with an average low of 61°. 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 Greenbelt. See also: October | November | December.
