S
M
T
W
T
F
S
30
81°
58°
31
77°
58°
1
78°
57°
2
80°
57°
3
80°
56°
4
79°
56°
5
80°
55°
6
80°
56°
7
83°
44°
8
74°
46°
9
74°
48°
10
79°
46°
11
76°
45°
12
77°
46°
13
76°
51°
14
81°
54°
15
85°
50°
16
77°
51°
17
82°
57°
18
84°
56°
19
81°
53°
20
81°
55°
21
84°
50°
22
78°
46°
23
74°
49°
24
71°
44°
25
69°
46°
26
72°
45°
27
77°
41°
28
69°
49°
29
71°
46°
30
77°
43°
1
70°
50°
2
77°
46°
3
79°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Heppner
Heppner's September 2026 forecast shows daily high temperatures ranging from 69° to 85°, with overnight lows between 41° and 58°. The average high for September is 78° 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 Heppner. See also: October | November | December.
