S
M
T
W
T
F
S
30
87°
53°
31
87°
49°
1
78°
53°
2
87°
46°
3
80°
47°
4
76°
51°
5
79°
53°
6
86°
48°
7
79°
48°
8
74°
44°
9
75°
42°
10
74°
42°
11
75°
50°
12
79°
47°
13
78°
48°
14
80°
50°
15
82°
52°
16
84°
51°
17
78°
43°
18
72°
49°
19
74°
47°
20
79°
46°
21
80°
42°
22
76°
39°
23
69°
44°
24
75°
42°
25
80°
46°
26
70°
43°
27
Hist. Avg.
72°
41°
28
Hist. Avg.
72°
41°
29
Hist. Avg.
71°
40°
30
Hist. Avg.
71°
40°
1
Hist. Avg.
70°
40°
2
Hist. Avg.
70°
40°
3
Hist. Avg.
69°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in La Grande
La Grande's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 39° and 53°. The average high for September is 78° with an average low of 47°. 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.
