Weather in Castro Valley, CA
Castro Valley, Sunday, 9 August, 03:27
Clear. Feels like 59°. High 87°, low 59°.
Monthly outlook for Castro Valley, CA: average high 80.1°, average low 57.4°. That is 0.9° 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 9 August (87.4°), the coolest 24 August (54.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.6° | 78.8° | +1.6° |
| 19 August – 28 August | 77.5° | 78.5° | -0.6° |
| 29 August – 7 September | at normal | 80.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — San Lorenzo (5 mi).
0
Castro Valley, Monday, 10 August
Mostly clear. High 85°, low 60°.
0
Castro Valley, Tuesday, 11 August
Clear. High 87°, low 58°.
0Castro Valley, Wednesday, 12 August
Clear. High 85°, low 58°.
0
Castro Valley, Thursday, 13 August
Partly cloudy. High 81°, low 57°.
0Castro Valley, Friday, 14 August
Clear. High 79°, low 56°.
0Castro Valley, Saturday, 15 August
Mostly clear. High 80°, low 56°.
0
Castro Valley, Sunday, 16 August
Overcast. High 79°, low 58°.
0Castro Valley, Monday, 17 August
Partly cloudy. High 75°, low 56°.
0Castro Valley, Tuesday, 18 August
Clear. High 77°, low 56°.
0Castro Valley, Wednesday, 19 August
Clear. High 77°, low 61°.
0Castro Valley, Thursday, 20 August
Overcast. High 76°, low 59°.
0Castro Valley, Friday, 21 August
Overcast. High 74°, low 56°.
0Castro Valley, Saturday, 22 August
Partly cloudy. High 79°, low 58°.
0Castro Valley, Sunday, 23 August
Mostly clear. High 79°, low 56°.
0Castro Valley, Monday, 24 August
Clear. High 81°, low 54°.
0Castro Valley, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Castro Valley, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Castro Valley, Thursday, 27 August
Climate normal for this date — 60-year average.
0Castro Valley, Friday, 28 August
Climate normal for this date — 60-year average.
0Castro Valley, Saturday, 29 August
Climate normal for this date — 60-year average.
0Castro Valley, Sunday, 30 August
Climate normal for this date — 60-year average.
0Castro Valley, Monday, 31 August
Climate normal for this date — 60-year average.
0Castro Valley, Tuesday, 1 September
Climate normal for this date — 60-year average.
0Castro Valley, Wednesday, 2 September
Climate normal for this date — 60-year average.
0Castro Valley, Thursday, 3 September
Climate normal for this date — 60-year average.
0Castro Valley, Friday, 4 September
Climate normal for this date — 60-year average.
0Castro Valley, Saturday, 5 September
Climate normal for this date — 60-year average.
0Castro Valley, Sunday, 6 September
Climate normal for this date — 60-year average.
0Castro 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 Castro 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 Castro 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
69°Weather in Annapolis, MD75°Weather in Atlanta, GA71°Weather in Augusta, ME66°Weather in Austin, TX78°Weather in Baton Rouge, LA
76°Weather in Bismarck, ND63°Weather in Boise, ID69°Weather in Boston, MA71°Weather in Carson City, NV70°Weather in Charleston, WV73°Weather in Charlotte Amalie, VI
81°Weather in Cheyenne, WY68°Weather in Columbia, SC73°Weather in Columbus, OH68°Weather in Concord, NH69°Weather in Denver, CO73°Weather in Des Moines, IA74°Weather in Dover, DE75°Weather in Frankfort, KY70°Weather in Harrisburg, PA71°Weather in Hartford, CT71°Weather in Helena, MT61°Weather in Honolulu, HI77°Weather in Indianapolis, IN71°Weather in Jackson, MS75°Weather in Jefferson City, MO75°Weather in Juneau, AK47°Weather in Lansing, MI58°Weather in Lincoln, NE76°Weather in Little Rock, AR73°Weather in Madison, WI63°Weather in Montgomery, AL75°Weather in Montpelier, VT63°Weather in Nashville, TN69°Weather in Oklahoma City, OK80°Weather in Olympia, WA55°Weather in Phoenix, AZ92°Weather in Pierre, SD70°Weather in Providence, RI73°Weather in Raleigh, NC73°Weather in Richmond, VA74°Weather in Sacramento, CA68°Weather in Salem, OR59°Weather in Salt Lake City, UT80°Weather in San Juan, PR80°Weather in Santa Fe, NM71°Weather in Springfield, IL72°Weather in St. Paul, MN66°Weather in Tallahassee, FL74°Weather in Topeka, KS76°Weather in Trenton, NJ71°Weather in Washington, DC74°74°Weather in Rancho Dos Palmas, CA98°Weather in Rand, CA85°Weather in Sandia, CA93°Weather in Sandyland Cove, CA67°Weather in Serena, CA70°Weather in Serena Park, CA71°Weather in Sespe Village, CA66°Weather in Singing Springs, CA70°Weather in Slater, CA73°Weather in Three Arch Bay, CA69°Weather in Trocha, CA75°Weather in Venida, CA76°Weather in West Venida, CA76°Weather in Wilsie, CA94°Weather in Patrick Creek, CA52°Weather in Abbott, CA69°Weather in Adams, CA69°Weather in Adela, CA72°Weather in Advance, CA84°