S
M
T
W
T
F
S
30
86°
64°
31
87°
64°
1
86°
63°
2
87°
65°
3
87°
65°
4
86°
64°
5
86°
63°
6
85°
65°
7
87°
62°
8
80°
61°
9
82°
61°
10
84°
60°
11
84°
61°
12
83°
60°
13
83°
59°
14
70°
53°
15
71°
57°
16
71°
57°
17
74°
54°
18
85°
57°
19
84°
45°
20
81°
43°
21
65°
44°
22
69°
46°
23
70°
54°
24
72°
54°
25
77°
55°
26
78°
56°
27
79°
55°
28
80°
53°
29
77°
41°
30
72°
40°
1
66°
38°
2
63°
46°
3
65°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Menlo
Menlo's September 2026 forecast shows daily high temperatures ranging from 63° to 87°, with overnight lows between 38° and 65°. The average high for September is 78° 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 Menlo. See also: October | November | December.
