S
M
T
W
T
F
S
30
76°
38°
31
88°
39°
1
83°
49°
2
75°
53°
3
63°
42°
4
65°
37°
5
69°
44°
6
65°
46°
7
68°
50°
8
76°
41°
9
85°
40°
10
89°
41°
11
75°
51°
12
85°
39°
13
59°
48°
14
65°
43°
15
73°
36°
16
79°
54°
17
73°
49°
18
76°
44°
19
80°
43°
20
82°
43°
21
85°
43°
22
82°
46°
23
76°
37°
24
86°
39°
25
67°
42°
26
65°
39°
27
62°
32°
28
73°
33°
29
79°
34°
30
73°
44°
1
75°
39°
2
82°
40°
3
81°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in La Grande
La Grande'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 La Grande. See also: October | November | December.
