S
M
T
W
T
F
S
30
75°
51°
31
86°
49°
1
71°
58°
2
65°
57°
3
64°
53°
4
70°
53°
5
73°
51°
6
65°
56°
7
74°
54°
8
84°
48°
9
88°
50°
10
80°
52°
11
70°
52°
12
67°
54°
13
68°
49°
14
72°
50°
15
78°
51°
16
86°
53°
17
88°
54°
18
82°
53°
19
75°
52°
20
75°
53°
21
73°
52°
22
77°
51°
23
78°
52°
24
71°
46°
25
66°
51°
26
65°
47°
27
65°
44°
28
66°
44°
29
64°
42°
30
64°
42°
1
68°
50°
2
68°
48°
3
65°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gresham
Gresham's September 2026 forecast shows daily high temperatures ranging from 64° to 88°, with overnight lows between 42° and 54°. The average high for September is 72° 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 Gresham. See also: October | November | December.
