Weather in Portola Valley, CA
Portola Valley, Sunday, 9 August, 08:23
Clear. Feels like 60°. High 86°, low 59°.
Monthly outlook for Portola Valley, CA: average high 84.9°, average low 58.8°. That is 3.1° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 22 August (96.3°), the coolest 14 August (52.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 80.3° | 79.6° | +0.4° |
| 19 August – 28 August | 92.5° | 79.2° | +7.4° |
| 29 August – 7 September | at normal | 80.5° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Mountain View (8 mi).
0
Portola Valley, Monday, 10 August
Mostly clear. High 81°, low 59°.
0Portola Valley, Tuesday, 11 August
Clear. High 82°, low 55°.
0Portola Valley, Wednesday, 12 August
Clear. High 77°, low 54°.
0Portola Valley, Thursday, 13 August
Clear. High 76°, low 55°.
0
Portola Valley, Friday, 14 August
Partly cloudy. High 76°, low 53°.
0Portola Valley, Saturday, 15 August
Clear. High 78°, low 53°.
0
Portola Valley, Sunday, 16 August
Overcast. High 76°, low 55°.
0Portola Valley, Monday, 17 August
Overcast. High 84°, low 58°.
0Portola Valley, Tuesday, 18 August
Clear. High 86°, low 58°.
0Portola Valley, Wednesday, 19 August
Partly cloudy. High 88°, low 61°.
0Portola Valley, Thursday, 20 August
Overcast. High 89°, low 59°.
0Portola Valley, Friday, 21 August
Mostly clear. High 93°, low 62°.
0Portola Valley, Saturday, 22 August
Clear. High 96°, low 65°.
0Portola Valley, Sunday, 23 August
Overcast. High 96°, low 69°.
0Portola Valley, Monday, 24 August
Clear. High 93°, low 66°.
0Portola Valley, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Portola Valley, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Portola Valley, Thursday, 27 August
Climate normal for this date — 60-year average.
0Portola Valley, Friday, 28 August
Climate normal for this date — 60-year average.
0Portola Valley, Saturday, 29 August
Climate normal for this date — 60-year average.
0Portola Valley, Sunday, 30 August
Climate normal for this date — 60-year average.
0Portola Valley, Monday, 31 August
Climate normal for this date — 60-year average.
0Portola Valley, Tuesday, 1 September
Climate normal for this date — 60-year average.
0Portola Valley, Wednesday, 2 September
Climate normal for this date — 60-year average.
0Portola Valley, Thursday, 3 September
Climate normal for this date — 60-year average.
0Portola Valley, Friday, 4 September
Climate normal for this date — 60-year average.
0Portola Valley, Saturday, 5 September
Climate normal for this date — 60-year average.
0Portola Valley, Sunday, 6 September
Climate normal for this date — 60-year average.
0Portola Valley, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Portola Valley, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Portola Valley, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
80°Weather in Annapolis, MD85°Weather in Atlanta, GA87°Weather in Augusta, ME81°Weather in Austin, TX84°Weather in Baton Rouge, LA87°Weather in Bismarck, ND66°Weather in Boise, ID65°Weather in Boston, MA85°Weather in Carson City, NV76°Weather in Charleston, WV81°Weather in Charlotte Amalie, VI84°Weather in Cheyenne, WY76°Weather in Columbia, SC85°Weather in Columbus, OH79°Weather in Concord, NH82°Weather in Denver, CO84°Weather in Des Moines, IA79°Weather in Dover, DE87°Weather in Frankfort, KY82°Weather in Harrisburg, PA84°Weather in Hartford, CT84°Weather in Helena, MT62°Weather in Honolulu, HI
75°Weather in Indianapolis, IN80°Weather in Jackson, MS88°Weather in Jefferson City, MO82°Weather in Juneau, AK47°Weather in Lansing, MI73°Weather in Lincoln, NE86°Weather in Little Rock, AR82°Weather in Madison, WI69°Weather in Montgomery, AL84°Weather in Montpelier, VT77°Weather in Nashville, TN78°Weather in Oklahoma City, OK81°Weather in Olympia, WA56°Weather in Phoenix, AZ92°Weather in Pierre, SD71°Weather in Providence, RI85°Weather in Raleigh, NC85°Weather in Richmond, VA87°Weather in Sacramento, CA67°Weather in Salem, OR61°Weather in Salt Lake City, UT84°Weather in San Juan, PR87°Weather in Santa Fe, NM74°Weather in Springfield, IL81°Weather in St. Paul, MN71°Weather in Tallahassee, FL82°Weather in Topeka, KS81°Weather in Trenton, NJ85°Weather in Washington, DC87°61°Weather in Eagleville, CA67°Weather in Benbow, CA60°Weather in Big Lagoon, CA55°Weather in Fieldbrook, CA54°Weather in Myers Flat, CA61°Weather in Orick, CA56°Weather in Shelter Cove, CA59°Weather in Fields Landing, CA55°Weather in Trinity Village, CA56°Weather in Janesville, CA76°Weather in Cassel, CA74°Weather in Bend, CA79°Weather in Flournoy, CA74°Weather in Mabie, CA72°Weather in Bangor, CA83°Weather in Berry Creek, CA78°Weather in Butte Meadows, CA68°Weather in Cherokee, CA81°Weather in Clipper Mills, CA74°