S
M
T
W
T
F
S
30
77°
52°
31
70°
52°
1
76°
57°
2
78°
59°
3
76°
59°
4
75°
56°
5
78°
56°
6
75°
57°
7
80°
55°
8
87°
58°
9
84°
61°
10
82°
57°
11
79°
57°
12
77°
56°
13
79°
57°
14
78°
55°
15
80°
53°
16
76°
54°
17
81°
55°
18
76°
56°
19
82°
55°
20
83°
56°
21
83°
56°
22
82°
54°
23
77°
56°
24
78°
53°
25
82°
56°
26
83°
57°
27
84°
57°
28
83°
56°
29
82°
57°
30
83°
57°
1
82°
56°
2
79°
55°
3
75°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Atherton
Atherton's September 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 53° and 61°. The average high for September is 80° with an average low of 56°. 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 Atherton. See also: October | November | December.
