S
M
T
W
T
F
S
30
75°
51°
31
86°
49°
1
71°
58°
2
65°
57°
3
64°
53°
4
70°
53°
5
73°
51°
6
65°
56°
7
74°
54°
8
84°
48°
9
88°
50°
10
80°
52°
11
72°
50°
12
67°
52°
13
63°
53°
14
71°
51°
15
70°
51°
16
83°
47°
17
86°
49°
18
67°
50°
19
73°
48°
20
79°
50°
21
70°
52°
22
73°
52°
23
71°
48°
24
76°
45°
25
66°
47°
26
70°
43°
27
77°
47°
28
71°
41°
29
68°
56°
30
72°
51°
1
76°
55°
2
75°
53°
3
81°
53°
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 72° to 81°, with overnight lows between 51° and 55°. The average high for September is 76° with an average low of 53°. 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.
