Sunnyvale Weather in August
Average highs run from 76°F on August 1 to 78°F on August 31, and lows from 59°F to 58°F. Normal precipitation for the month is 0.01 in over about 0 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 77°F
- Average low
- 59°F
- Precipitation
- 0.01 in
- Record high
- 101°FAug 1, 1993
- Record low
- 47°FAug 5, 1946
- Chance of a freeze
- 0%
- Days of 90°F or more
- 1.6
- Daylight
- 14 h 03 min to 13 h 00 min
- Cloud cover
- 14%
- Humidity
- 62%
- Dew point
- 50°F
- Wind
- 8.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 76°F | 59°F | 101°F 1993 | 52°F 1956 | 1% |
| Aug 2 | 76°F | 59°F | 95°F 1946 | 49°F 1956 | 1% |
| Aug 3 | 76°F | 59°F | 95°F 1998 | 49°F 1954 | 1% |
| Aug 4 | 76°F | 59°F | 93°F 1998 | 49°F 1949 | 1% |
| Aug 5 | 76°F | 59°F | 89°F 1978 | 47°F 1946 | 1% |
| Aug 6 | 76°F | 59°F | 95°F 1983 | 49°F 1950 | 1% |
| Aug 7 | 76°F | 59°F | 97°F 1984 | 49°F 1947 | 1% |
| Aug 8 | 76°F | 59°F | 94°F 2002 | 49°F 1949 | 1% |
| Aug 9 | 76°F | 59°F | 96°F 2002 | 50°F 1948 | 1% |
| Aug 10 | 77°F | 59°F | 91°F 2009 | 50°F 1947 | 1% |
| Aug 11 | 77°F | 59°F | 88°F 1998 | 50°F 1947 | 1% |
| Aug 12 | 77°F | 59°F | 91°F 1998 | 49°F 1945 | 1% |
| Aug 13 | 77°F | 59°F | 93°F 1991 | 50°F 1946 | 1% |
| Aug 14 | 77°F | 59°F | 95°F 2019 | 48°F 1955 | 1% |
| Aug 15 | 77°F | 59°F | 95°F 2015 | 50°F 1954 | 1% |
| Aug 16 | 77°F | 59°F | 97°F 2015 | 51°F 1948 | 1% |
| Aug 17 | 77°F | 59°F | 85°F 1950 | 50°F 1956 | 1% |
| Aug 18 | 77°F | 59°F | 90°F 1978 | 51°F 1949 | 1% |
| Aug 19 | 77°F | 59°F | 89°F 1964 | 51°F 1957 | 1% |
| Aug 20 | 77°F | 59°F | 88°F 1974 | 50°F 1948 | 1% |
| Aug 21 | 77°F | 59°F | 87°F 1993 | 51°F 1947 | 1% |
| Aug 22 | 77°F | 59°F | 92°F 1999 | 47°F 1947 | 1% |
| Aug 23 | 77°F | 59°F | 93°F 2010 | 52°F 1949 | 1% |
| Aug 24 | 77°F | 59°F | 100°F 2010 | 50°F 1955 | 1% |
| Aug 25 | 77°F | 59°F | 93°F 1988 | 49°F 1953 | 1% |
| Aug 26 | 78°F | 59°F | 94°F 1993 | 50°F 1955 | 1% |
| Aug 27 | 78°F | 59°F | 98°F 1993 | 50°F 1960 | 1% |
| Aug 28 | 78°F | 59°F | 101°F 2009 | 50°F 1957 | 1% |
| Aug 29 | 78°F | 59°F | 100°F 1977 | 51°F 1945 | 1% |
| Aug 30 | 78°F | 59°F | 90°F 2005 | 47°F 1955 | 1% |
| Aug 31 | 78°F | 58°F | 94°F 2005 | 50°F 1946 | 1% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- August 1
- sunrise 6:13 AM, sunset 8:16 PM
- August 31
- sunrise 6:38 AM, sunset 7:38 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00023244 (Moffett Federal Airfield), public domain. Records: NOAA GHCN-Daily, station USW00023244, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.