S
M
T
W
T
F
S
30
81°
56°
31
79°
55°
1
82°
56°
2
82°
56°
3
79°
54°
4
78°
51°
5
75°
50°
6
77°
51°
7
74°
46°
8
72°
46°
9
74°
46°
10
77°
45°
11
74°
44°
12
73°
48°
13
75°
54°
14
80°
53°
15
83°
49°
16
77°
52°
17
79°
56°
18
79°
54°
19
73°
53°
20
78°
54°
21
79°
50°
22
69°
48°
23
68°
45°
24
69°
46°
25
71°
47°
26
74°
47°
27
72°
42°
28
67°
47°
29
71°
48°
30
72°
47°
1
69°
46°
2
74°
50°
3
74°
46°
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 67° to 83°, with overnight lows between 42° and 56°. The average high for September is 75° with an average low of 50°. 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.
