S
M
T
W
T
F
S
30
82°
55°
31
87°
56°
1
88°
45°
2
78°
45°
3
Hist. Avg.
82°
48°
4
Hist. Avg.
82°
48°
5
Hist. Avg.
82°
48°
6
Hist. Avg.
81°
48°
7
Hist. Avg.
81°
47°
8
Hist. Avg.
80°
47°
9
Hist. Avg.
80°
47°
10
Hist. Avg.
80°
46°
11
Hist. Avg.
79°
46°
12
Hist. Avg.
79°
46°
13
Hist. Avg.
79°
46°
14
Hist. Avg.
78°
45°
15
Hist. Avg.
78°
45°
16
Hist. Avg.
77°
45°
17
Hist. Avg.
77°
44°
18
Hist. Avg.
76°
44°
19
Hist. Avg.
76°
44°
20
Hist. Avg.
76°
44°
21
Hist. Avg.
75°
43°
22
Hist. Avg.
75°
43°
23
Hist. Avg.
74°
42°
24
Hist. Avg.
74°
42°
25
Hist. Avg.
73°
42°
26
Hist. Avg.
73°
42°
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 78° to 88°, with overnight lows between 45° and 56°. The average high for September is 84° 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 La Grande. See also: October | November | December.
