As of 10:47 PDT

Cupertino, CA weather in September

79°

Cupertino, Sunday, 9 August, 10:47

Clear. Feels like 79°. High 87°, low 59°.

Pressure29.83 inHg

Wind3.8 mph N

Humidity59%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

In September, Cupertino, CA averages a high of 80.1° and a low of 59°. About 0.2 inches of precipitation fall over the month (1 wet days). The record high is 113.9° (2022) and the record low 48.4° (1970). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	82.8°	59.2°	2%	107.6° (2017)	51.4° (1964)
2	82.2°	60.4°	3%	108.7° (2017)	52.2° (1964)
3	81.9°	59.5°	0%	100.8° (2017)	52.2° (1995)
4	81.9°	59.5°	0%	97.5° (1988)	51.6° (1960)
5	82.8°	59.7°	0%	102° (2022)	50.5° (1965)
6	82.8°	60.3°	0%	113.9° (2022)	52.2° (2001)
7	82.9°	60.6°	0%	104.9° (2020)	51.6° (1978)
8	81.5°	59.9°	2%	100.2° (1984)	50.5° (1978)
9	79.9°	59.2°	5%	98.6° (2015)	52° (1964)
10	80.1°	58.5°	5%	99° (2015)	51.1° (1991)
11	80.6°	59.2°	2%	99.5° (1983)	52° (1985)
12	79.9°	59.2°	0%	100.8° (1979)	50.4° (1966)
13	79.2°	59°	2%	104.7° (1971)	48.4° (1970)
14	77.9°	58.1°	3%	108° (1971)	50.9° (1980)
15	77.4°	57.4°	0%	100.6° (1971)	49.6° (2006)
16	77.7°	57.2°	8%	93.9° (1984)	51.4° (2018)
17	78.1°	57.6°	3%	100° (1984)	51.6° (2024)
18	78.1°	58.6°	7%	98.6° (1984)	48.4° (1978)
19	78.6°	58.8°	3%	95.4° (2000)	49.8° (2018)
20	80.1°	58.3°	2%	97.7° (2015)	48.9° (1968)
21	79.9°	59°	5%	97.5° (2003)	51.4° (1960)
22	79.2°	58.1°	3%	95° (2003)	49.1° (2017)
23	80.8°	58.6°	3%	95.5° (2024)	50.9° (2023)
24	80.2°	59.5°	5%	98.2° (1978)	50.2° (1981)
25	80.1°	59.4°	7%	96.8° (1963)	50.4° (1986)
26	79.7°	59°	5%	99.5° (1963)	48.7° (2013)
27	79.5°	59.2°	5%	99.5° (2010)	49.6° (1982)
28	79.2°	59.4°	8%	100° (2010)	50° (1971)
29	79°	58.6°	2%	94.8° (1978)	48.4° (2019)
30	78.4°	59°	8%	97° (1980)	49.1° (1971)