Sunnyvale climate

Sunnyvale Weather in August

NOAA 1991-2020 normals for Lavon Dam, 27.4 km from Sunnyvale

Average highs run from 94°F on August 1 to 91°F on August 31, and lows from 74°F to 71°F. Normal precipitation for the month is 2.15 in over about 5 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Sunnyvale, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
93°F
Average low
73°F
Precipitation
2.15 in
Record high
111°FAug 2, 2011
Record low
50°FAug 30, 1986
Chance of a freeze
0%
Days of 90°F or more
26.5
Daylight
13 h 45 min to 12 h 52 min
Cloud cover
43%
Humidity
60%
Dew point
67°F
Wind
7.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 194°F74°F109°F 201163°F 198916%0%
Aug 294°F74°F111°F 201163°F 198916%0%
Aug 394°F74°F111°F 201163°F 198916%0%
Aug 494°F74°F110°F 201163°F 198916%0%
Aug 594°F74°F108°F 196462°F 197316%0%
Aug 694°F74°F107°F 200361°F 198917%0%
Aug 794°F74°F106°F 201260°F 198917%0%
Aug 894°F74°F106°F 201160°F 198917%0%
Aug 994°F74°F107°F 201158°F 198917%0%
Aug 1094°F74°F107°F 201560°F 198917%0%
Aug 1194°F74°F108°F 196461°F 198917%0%
Aug 1294°F74°F108°F 202357°F 196717%0%
Aug 1394°F74°F107°F 196952°F 196718%0%
Aug 1494°F74°F105°F 196955°F 196718%0%
Aug 1594°F73°F107°F 201158°F 199218%0%
Aug 1694°F73°F106°F 201159°F 199218%0%
Aug 1794°F73°F110°F 202360°F 199218%0%
Aug 1894°F73°F111°F 202360°F 199218%0%
Aug 1993°F73°F111°F 198462°F 199219%0%
Aug 2093°F73°F110°F 202363°F 199219%0%
Aug 2193°F73°F108°F 202364°F 198119%0%
Aug 2293°F73°F107°F 198064°F 196719%0%
Aug 2393°F73°F107°F 198062°F 198919%0%
Aug 2492°F72°F109°F 201060°F 196619%0%
Aug 2592°F72°F109°F 202359°F 196619%0%
Aug 2692°F72°F110°F 202358°F 196620%0%
Aug 2792°F72°F109°F 201164°F 197020%0%
Aug 2892°F72°F109°F 201156°F 199220%0%
Aug 2991°F71°F107°F 198456°F 199220%0%
Aug 3091°F71°F105°F 200050°F 198620%0%
Aug 3191°F71°F108°F 200060°F 200820%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Sunnyvale, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:40 AM, sunset 8:25 PM
August 31
sunrise 7:00 AM, sunset 7:52 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00415094 (Lavon Dam), public domain. Records: NOAA GHCN-Daily, station USC00413133, 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.