As of 23:30 PDT

Sunnyvale, CA weather in September

63°

Sunnyvale, Saturday, 8 August, 23:30

Clear. Feels like 63°. High 87°, low 61°.

Pressure29.85 inHg

Wind2 mph NW

Humidity84%

Visibility6.2 mi

Dew point58°

See detailed hourly forecast

In September, Sunnyvale, CA averages a high of 80.1° and a low of 59.5°. 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° (1971). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	82.8°	59.5°	2%	107.6° (2017)	52° (1964)
2	82.6°	61°	2%	108.7° (2017)	52.2° (1960)
3	81.9°	60.3°	0%	100.8° (2017)	53.2° (1970)
4	81.9°	59.9°	0%	98.1° (1988)	51.4° (1960)
5	82.9°	60.3°	0%	102° (2022)	51.6° (1996)
6	82.9°	60.6°	0%	113.9° (2022)	52.3° (1973)
7	83.1°	61.2°	0%	104.9° (2020)	52.2° (1978)
8	81.9°	60.4°	2%	101.3° (1984)	51.4° (1978)
9	79.9°	59.5°	5%	99.3° (2015)	51.4° (1964)
10	80.1°	59°	5%	98.6° (2015)	51.4° (2005)
11	80.6°	59.5°	2%	100.2° (1983)	52.3° (2005)
12	79.9°	59.5°	0%	102° (1979)	50° (1966)
13	79.2°	59.4°	2%	105.1° (1971)	48.9° (1970)
14	77.7°	58.5°	3%	108.5° (1971)	50.5° (1980)
15	77.2°	57.7°	0%	102.2° (1971)	49.1° (2006)
16	77.5°	57.6°	8%	94.1° (1984)	51.4° (2018)
17	78.1°	58.1°	2%	101.5° (1984)	51.6° (2024)
18	78.1°	59.2°	5%	100° (1984)	50.2° (2008)
19	78.8°	59.4°	3%	96.4° (2000)	49.8° (2018)
20	80.2°	59.2°	2%	98.6° (2015)	50.4° (1968)
21	80.1°	59.5°	7%	98.1° (2003)	51.1° (1960)
22	79.2°	58.8°	2%	96.4° (2003)	49.1° (2017)
23	80.6°	59.2°	3%	95.7° (1997)	50.9° (2023)
24	80.2°	60.1°	5%	98.6° (1978)	49.6° (1981)
25	80.1°	60.1°	7%	97.2° (1963)	51.1° (2023)
26	79.7°	59.9°	0%	100.6° (1963)	50.2° (1982)
27	79.5°	59.7°	5%	99.7° (2010)	50.9° (1982)
28	79.2°	60.1°	5%	100.4° (2010)	51.3° (1964)
29	79.2°	59.4°	3%	94.8° (1978)	48.4° (2019)
30	78.4°	59.5°	10%	96.4° (1980)	48° (1971)