S
M
T
W
T
F
S
30
83°
52°
31
88°
53°
1
88°
55°
2
83°
51°
3
82°
51°
4
82°
52°
5
83°
53°
6
83°
52°
7
84°
51°
8
83°
54°
9
82°
55°
10
84°
57°
11
85°
56°
12
86°
57°
13
85°
59°
14
89°
58°
15
89°
57°
16
90°
56°
17
89°
55°
18
88°
55°
19
88°
54°
20
86°
55°
21
88°
56°
22
88°
56°
23
87°
55°
24
83°
56°
25
79°
55°
26
78°
54°
27
81°
55°
28
80°
56°
29
81°
55°
30
80°
55°
1
83°
52°
2
81°
52°
3
85°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Napa Abajo
Napa Abajo's September 2026 forecast shows daily high temperatures ranging from 78° to 90°, with overnight lows between 51° and 59°. The average high for September is 84° with an average low of 55°. 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 Napa Abajo. See also: October | November | December.
