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Current
Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Cupertino, CA
Content continues below
September
Average Temperature
High
27°
Feels 27
Low
13°
Feels 13
Average Precipitation
1 Days
Rain amount
9.2mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
26°
15
25°
16
24°
17
24°
18
26°
19
26°
20
23°
21
23°
22
23°
23
25°
24
25°
25
25°
26
25°
27
25°
28
23°
29
30
Forecast
Monday, September 14, 2026
Day
26°
Feels 26
Wind
24 km/h SW
Gust
36 km/h
Humidity
26%
P.O.P
0%
Night
14°
Feels 14
Wind
21 km/h W
Gust
31 km/h
Humidity
77%
P.O.P
0%
Historical Averages
Sep 14
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.