Portola Valley climate

Portola Valley Weather in April

NOAA 1991-2020 normals for Redwood City, 10.3 km from Portola Valley

Average highs run from 67°F on April 1 to 70°F on April 30, and lows from 45°F to 48°F. Normal precipitation for the month is 1.15 in over about 5 wet days.

April day by day

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

Normal daily high and low temperature at Portola Valley, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

April at a glance

Average high
69°F
Average low
47°F
Precipitation
1.15 in
Record high
98°FApr 22, 2009
Record low
31°FApr 7, 2001
Chance of a freeze
0%
Daylight
12 h 38 min to 13 h 43 min
Cloud cover
42%
Humidity
79%
Dew point
46°F
Wind
7.8 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
Apr 167°F45°F83°F 201134°F 197624%0%
Apr 267°F45°F83°F 195934°F 196324%0%
Apr 367°F46°F85°F 198537°F 195623%0%
Apr 467°F46°F85°F 195736°F 200923%0%
Apr 567°F46°F82°F 196132°F 201223%0%
Apr 667°F46°F86°F 198935°F 196422%0%
Apr 767°F46°F90°F 198931°F 200122%0%
Apr 868°F46°F92°F 198937°F 198021%0%
Apr 968°F46°F92°F 198935°F 200121%0%
Apr 1068°F46°F93°F 198935°F 197721%0%
Apr 1168°F46°F88°F 198834°F 200120%0%
Apr 1268°F46°F85°F 198834°F 195620%0%
Apr 1368°F46°F85°F 196233°F 197519%0%
Apr 1468°F46°F87°F 200835°F 200119%0%
Apr 1568°F46°F87°F 200832°F 197518%0%
Apr 1669°F46°F87°F 195435°F 195518%0%
Apr 1769°F47°F88°F 199934°F 196317%0%
Apr 1869°F47°F88°F 195431°F 197516%0%
Apr 1969°F47°F87°F 201637°F 200816%0%
Apr 2069°F47°F89°F 200935°F 201716%0%
Apr 2169°F47°F93°F 200937°F 196815%0%
Apr 2269°F47°F98°F 200937°F 197715%0%
Apr 2370°F47°F88°F 200937°F 200114%0%
Apr 2470°F47°F84°F 195934°F 196414%0%
Apr 2570°F48°F84°F 196631°F 196414%0%
Apr 2670°F48°F94°F 200435°F 196413%0%
Apr 2770°F48°F85°F 196535°F 195513%0%
Apr 2870°F48°F94°F 200437°F 195513%0%
Apr 2970°F48°F92°F 198137°F 196713%0%
Apr 3070°F48°F94°F 198139°F 196712%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Portola Valley, 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 (PDT).

April 1
sunrise 6:54 AM, sunset 7:32 PM
April 30
sunrise 6:15 AM, sunset 7:58 PM

Every day of April: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047339 (Redwood City), public domain. Records: NOAA GHCN-Daily, station USC00046646, 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.