S
M
T
W
T
F
S
30
82°
66°
31
88°
57°
1
83°
55°
2
88°
63°
3
90°
66°
4
86°
64°
5
84°
63°
6
79°
66°
7
81°
64°
8
84°
55°
9
77°
54°
10
79°
48°
11
86°
64°
12
70°
45°
13
70°
43°
14
61°
45°
15
70°
46°
16
72°
41°
17
72°
52°
18
60°
56°
19
62°
53°
20
66°
50°
21
61°
45°
22
62°
45°
23
62°
48°
24
66°
49°
25
69°
51°
26
68°
50°
27
66°
50°
28
68°
52°
29
68°
48°
30
67°
49°
1
65°
42°
2
59°
47°
3
62°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Atwater
Atwater's September 2026 forecast shows daily high temperatures ranging from 59° to 69°, with overnight lows between 42° and 56°. The average high for September is 64° with an average low of 49°. 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 Atwater. See also: October | November | December.
