Historical Weather in Sunnyvale, CA
See 55+ years of weather history for any date in Sunnyvale going back to 1970.
Part of California weather history · California temperature records
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Today in Sunnyvale Weather HistorySee records, averages, and 55+ years of data for today's date
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Monthly Climate Averages
Historical temperature and precipitation averages for Sunnyvale, CA, based on 55+ years of weather data.
Warmest MonthSeptemberAvg High: 79°F / Low: 57°F
Coldest MonthDecemberAvg High: 59°F / Low: 42°F
Jan
60°/ 42°
💧 6.3"
Feb
62°/ 44°
💧 6.5"
Mar
65°/ 47°
💧 5.5"
Apr
69°/ 48°
💧 4.3"
May
73°/ 52°
💧 3.0"
Jun
77°/ 56°
💧 2.9"
Jul
78°/ 58°
💧 2.4"
Aug
79°/ 59°
💧 2.5"
Sep
79°/ 57°
💧 3.6"
Oct
74°/ 53°
💧 5.0"
Nov
65°/ 47°
💧 5.3"
Dec
59°/ 42°
💧 6.1"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Sunnyvale, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Avg high Avg low
Sunnyvale, CA Monthly Precipitation
Average rainfall per month, in inches.
Rain (in)
Sunnyvale, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
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Best Time to Visit Sunnyvale, CA
Most pleasant months in Sunnyvale, CA: July, August.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal
Sunnyvale Temperature Records
- Record High: The hottest temperature ever recorded in Sunnyvale, CA is 112°F, set on August 3, 1998.
- Record Low: The coldest temperature ever recorded in Sunnyvale, CA is 19°F, set on December 22, 1990.
- Data Coverage: Based on 29 years of data from NOAA weather station: SAN JOSE.
All-Time Record High
112°F
August 3, 1998
All-Time Record Low
19°F
December 22, 1990
Monthly Temperature Records in Sunnyvale
| Month | Record High | Record Low |
|---|---|---|
| January | 79°F(2009) | 26°F(2007) |
| February | 81°F(1986) | 26°F(1989) |
| March | 91°F(2005) | 31°F(1971) |
| April | 100°F(2004) | 33°F(1976) |
| May | 104°F(2009) | 39°F(1975) |
| June | 111°F(2000) | 40°F(1999) |
| July | 111°F(2006) | 44°F(1999) |
| August | 112°F(1998) | 46°F(2005) |
| September | 112°F(2020) | 41°F(1971) |
| October | 107°F(2024) | 36°F(1971) |
| November | 86°F(1999) | 30°F(1971) |
| December | 76°F(2020) | 19°F(1990) |
Sunnyvale Snow RecordsSee the top 10 snowiest days ever recorded
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