S
M
T
W
T
F
S
30
82°
50°
31
71°
49°
1
71°
56°
2
76°
56°
3
70°
49°
4
71°
56°
5
79°
49°
6
73°
49°
7
71°
48°
8
69°
47°
9
69°
46°
10
68°
52°
11
72°
45°
12
69°
44°
13
68°
45°
14
71°
50°
15
73°
45°
16
70°
44°
17
66°
42°
18
64°
42°
19
63°
43°
20
64°
46°
21
64°
46°
22
63°
43°
23
65°
49°
24
69°
47°
25
69°
50°
26
71°
50°
27
71°
43°
28
67°
40°
29
60°
43°
30
63°
49°
1
62°
50°
2
65°
46°
3
68°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Happy Valley
Happy Valley's September 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 40° and 56°. The average high for September is 69° 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 Happy Valley. See also: October | November | December.
