S
M
T
W
T
F
S
30
80°
46°
31
86°
51°
1
88°
51°
2
88°
52°
3
86°
49°
4
80°
46°
5
79°
47°
6
80°
45°
7
81°
42°
8
78°
42°
9
77°
50°
10
78°
51°
11
77°
44°
12
78°
42°
13
77°
41°
14
77°
43°
15
78°
44°
16
84°
47°
17
86°
48°
18
86°
49°
19
85°
48°
20
85°
48°
21
86°
47°
22
85°
48°
23
85°
47°
24
82°
47°
25
79°
43°
26
71°
42°
27
70°
44°
28
73°
43°
29
74°
41°
30
70°
42°
1
69°
44°
2
74°
45°
3
73°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Surprise Valley
Surprise Valley's September 2026 forecast shows daily high temperatures ranging from 69° to 88°, with overnight lows between 39° and 52°. The average high for September is 80° with an average low of 46°. 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 Surprise Valley. See also: October | November | December.
