S
M
T
W
T
F
S
30
86°
61°
31
88°
53°
1
85°
53°
2
77°
60°
3
80°
61°
4
87°
56°
5
87°
50°
6
77°
51°
7
77°
58°
8
82°
56°
9
83°
51°
10
76°
53°
11
75°
51°
12
75°
48°
13
74°
47°
14
74°
48°
15
75°
53°
16
76°
56°
17
82°
57°
18
83°
55°
19
83°
51°
20
76°
52°
21
81°
53°
22
75°
44°
23
82°
45°
24
71°
44°
25
71°
44°
26
69°
43°
27
68°
41°
28
Hist. Avg.
76°
46°
29
Hist. Avg.
76°
46°
30
Hist. Avg.
76°
45°
1
Hist. Avg.
75°
45°
2
Hist. Avg.
75°
44°
3
Hist. Avg.
74°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Gresham
Gresham's September 2026 forecast shows daily high temperatures ranging from 68° to 88°, with overnight lows between 41° and 61°. The average high for September is 78° with an average low of 52°. 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.
