S
M
T
W
T
F
S
30
79°
48°
31
88°
45°
1
86°
56°
2
77°
56°
3
68°
48°
4
76°
42°
5
74°
51°
6
71°
53°
7
78°
54°
8
81°
44°
9
86°
44°
10
90°
46°
11
77°
48°
12
76°
47°
13
68°
55°
14
73°
48°
15
69°
45°
16
80°
47°
17
67°
47°
18
82°
51°
19
83°
47°
20
86°
47°
21
86°
48°
22
78°
61°
23
77°
47°
24
75°
43°
25
74°
52°
26
68°
44°
27
66°
39°
28
75°
34°
29
79°
58°
30
77°
51°
1
76°
42°
2
81°
44°
3
81°
44°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
