S
M
T
W
T
F
S
30
77°
52°
31
70°
52°
1
73°
58°
2
77°
60°
3
76°
58°
4
75°
56°
5
78°
56°
6
78°
54°
7
84°
55°
8
83°
58°
9
84°
61°
10
84°
57°
11
84°
57°
12
82°
56°
13
80°
57°
14
82°
53°
15
80°
56°
16
76°
54°
17
81°
55°
18
79°
54°
19
75°
51°
20
76°
56°
21
76°
54°
22
80°
54°
23
75°
53°
24
74°
49°
25
73°
49°
26
73°
50°
27
72°
49°
28
73°
50°
29
74°
49°
30
73°
51°
1
73°
49°
2
74°
51°
3
79°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Menlo Park
Menlo Park's September 2026 forecast shows daily high temperatures ranging from 72° to 84°, with overnight lows between 49° and 61°. The average high for September is 77° with an average low of 54°. 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 Park. See also: October | November | December.
