S
M
T
W
T
F
S
30
93°
60°
31
93°
60°
1
92°
59°
2
92°
59°
3
88°
57°
4
84°
58°
5
83°
57°
6
83°
54°
7
84°
56°
8
83°
57°
9
82°
57°
10
82°
54°
11
83°
54°
12
82°
55°
13
82°
53°
14
88°
54°
15
86°
52°
16
82°
52°
17
87°
53°
18
85°
52°
19
81°
50°
20
80°
48°
21
80°
47°
22
81°
48°
23
83°
45°
24
78°
46°
25
79°
45°
26
80°
46°
27
82°
44°
28
78°
48°
29
80°
46°
30
80°
45°
1
83°
49°
2
82°
46°
3
80°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in North Valley
North Valley's September 2026 forecast shows daily high temperatures ranging from 78° to 93°, with overnight lows between 44° and 60°. The average high for September is 83° with an average low of 52°. 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 North Valley. See also: October | November | December.
