Michael D Beckwith / CC BY 2.0
Sunnyvale, CA Weather on August 25
August 25th in Sunnyvale, CA typically brings pleasant summer weather, with average highs around 78°F and lows near 59°F. Over 55 years of records, the warmest August 25th was in 1988 (78°F average), while the coldest was 1975 (63°F) — a 15°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
What to Expect on August 25
Planning for August 25th in Sunnyvale, CA? Great weather for outdoor activities.
August 25 Weather Records for Sunnyvale
- •The all-time record high for August 25th in Sunnyvale, CA is 93°F, set in 1988.
- •The coldest August 25th on record dropped to 54°F in 1995.
- •Temperatures have reached 90°F or higher on August 25th in 5 of the last 55 years.
Frequently Asked Questions
What was the warmest August 25 ever in Sunnyvale?
The warmest August 25 in Sunnyvale, CA reached 93°F in 1988. That is 15°F above the long-term average high of 78°F.
What was the coldest August 25 ever in Sunnyvale?
The coldest August 25 in Sunnyvale, CA dropped to 54°F in 1995. That is 5°F below the long-term average low of 59°F.
What is the average temperature on August 25 in Sunnyvale?
On August 25, Sunnyvale averages a high of 78°F and a low of 59°F based on 55 years of NOAA weather observations from MOFFETT FED AIRFIELD.
How many years of weather data are available for August 25 in Sunnyvale?
We have 55 years of weather records for August 25 in Sunnyvale, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 25 Weather History in Sunnyvale
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 75°F | 63°F | -- | -- |
| 2024 | 86°F | 59°F | 0" | -- |
| 2023 | 77°F | 64°F | 0" | -- |
| 2022 | 84°F | 57°F | 0" | -- |
| 2021 | 76°F | 56°F | 0" | -- |
| 2020 | 79°F | 63°F | 0" | -- |
| 2019 | 80°F | 64°F | 0" | -- |
| 2018 | 75°F | 58°F | 0" | -- |
| 2017 | 77°F | 58°F | 0" | -- |
| 2016 | 72°F | 60°F | 0" | -- |
| 2015 | 76°F | 59°F | 0" | -- |
| 2014 | 76°F | 59°F | 0" | -- |
| 2013 | 80°F | 63°F | 0" | -- |
| 2012 | 72°F | 58°F | 0" | -- |
| 2011 | 75°F | 62°F | 0" | -- |
| 2010 | 91°F | 64°F | 0" | -- |
| 2009 | 77°F | 57°F | 0" | -- |
| 2008 | 80°F | 60°F | 0" | -- |
| 2007 | 74°F | 61°F | 0" | -- |
| 2006 | 73°F | 57°F | 0" | -- |
| 2005 | 74°F | 58°F | 0" | -- |
| 2004 | 79°F | 59°F | 0" | -- |
| 2003 | 90°F | 65°F | 0" | -- |
| 2002 | 71°F | 55°F | 0" | -- |
| 2001 | 76°F | 57°F | 0" | -- |
| 2000 | 81°F | 59°F | 0" | -- |
| 1999 | 90°F | 59°F | 0" | -- |
| 1998 | 71°F | 58°F | 0" | -- |
| 1997 | 81°F | 59°F | 0" | -- |
| 1996 | 71°F | 59°F | -- | -- |
| 1995 | 76°F | 54°F | 0" | -- |
| 1994 | 82°F | 54°F | 0" | -- |
| 1993 | 90°F | 62°F | 0" | -- |
| 1992 | 77°F | 57°F | 0" | -- |
| 1991 | 76°F | 57°F | 0" | -- |
| 1990 | 73°F | 59°F | 0" | -- |
| 1989 | 82°F | 59°F | 0" | -- |
| 1988 | 93°F | 62°F | 0" | -- |
| 1987 | 78°F | 62°F | 0" | -- |
| 1986 | 75°F | 60°F | 0" | -- |
| 1985 | 71°F | 60°F | 0" | -- |
| 1984 | 75°F | 58°F | 0" | -- |
| 1983 | 74°F | 59°F | 0" | -- |
| 1982 | 67°F | 60°F | 0" | -- |
| 1981 | 78°F | 56°F | 0" | -- |
| 1980 | 72°F | 60°F | 0" | -- |
| 1979 | 79°F | 58°F | 0" | -- |
| 1978 | 77°F | 63°F | 0" | -- |
| 1977 | 81°F | 59°F | 0" | -- |
| 1976 | 80°F | 59°F | 0" | -- |
| 1975 | 70°F | 56°F | 0" | -- |
| 1974 | 77°F | 60°F | 0" | -- |
| 1973 | 73°F | 59°F | 0" | -- |
| 1972 | 78°F | 58°F | 0" | -- |
| 1971 | 78°F | 61°F | 0" | -- |
Based on 55 years of data from NOAA station: MOFFETT FED AIRFIELD
Monthly Climate Averages
Historical temperature and precipitation averages for Sunnyvale, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.