Our Proprietary 10-Day Forecast

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Current warnings over Castro Valley, California
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Castro Valley, California red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Castro Valley, California red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Alameda County, CA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Castro Valley, California

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Castro Valley, CA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Castro Valley, CA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Castro Valley, CA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Castro Valley, California

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Alameda County, California

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
Get access to:
  • European ECMWF HRES
  • American GFS
  • Canadian GDPS GEM
  • German DWD ICON
  • British MetOffice's UKMET Unified Model
  • American NAM
  • American HRRR
  • American NBM - National Blend of Models
  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
See the latest forecast data as the models update.
 
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Climate Summary
(made with AI, use with caution)
Castro Valley, CA Climate Summary

Temperature

    •   Average annual temperature: 59.1°F (15.1°C)
    •   Average January temperature: 48.2°F (9°C)
    •   Average July temperature: 70.8°F (21.6°C)
    •   Record high temperature: 109°F (42.8°C)
    •   Record low temperature: 19°F (-7.2°C)

Precipitation

    •   Average annual precipitation: 21.7 inches (551 mm)
    •   Average number of rainy days: 63
    •   Wettest month: January (4.3 inches)
    •   Driest month: July (0.1 inches)

Snowfall

    •   Average annual snowfall: 0.4 inches (10 mm)
    •   Average number of days with snow: 0.3

Humidity

    •   Average annual relative humidity: 72%
    •   Most humid month: January (79%)
    •   Least humid month: August (63%)

Wind

    •   Average annual wind speed: 6.6 mph (10.6 km/h)
    •   Most windy month: January (7.7 mph)
    •   Least windy month: September (5.6 mph)

Sunshine

    •   Average annual sunshine: 2,900 hours
    •   Most sunshine: July (330 hours)
    •   Least sunshine: December (170 hours)

Climate Type

    •   Mediterranean climate

Köppen Climate Classification

    •   Csa (Mediterranean climate with hot, dry summers)

Hardiness Zone

    •   9b

Growing Season

    •   Average frost-free period: 270 days (March 15     •   November 12)

Climate Summary

Castro Valley, CA has a Mediterranean climate with hot, dry summers and mild, wet winters. The average annual temperature is 59.1°F (15.1°C), and the average annual precipitation is 21.7 inches (551 mm). The wettest month is January, with an average of 4.3 inches (109 mm) of rain, and the driest month is July, with an average of 0.1 inches (2.5 mm) of rain. Snowfall is rare in Castro Valley, averaging only 0.4 inches (10 mm) per year.

The summers in Castro Valley are hot and dry, with average temperatures in the upper 70s and low 80s Fahrenheit (mid-20s to low 30s Celsius). The humidity is typically low, making the heat feel less oppressive. The winters are mild and wet, with average temperatures in the mid-40s and low 50s Fahrenheit (7-12°C). The humidity is typically higher in the winter, and there is occasional fog.

Castro Valley is located in USDA Hardiness Zone 9b, which means that it is suitable for growing a wide variety of plants, including citrus trees, avocados, and bougainvillea. The growing season in Castro Valley is long, averaging 270 days per year.

Overall, Castro Valley has a pleasant climate that is ideal for outdoor activities year-round.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Castro Valley is home to the Hayward Fault, a major earthquake fault that runs through the East Bay.

    •   The valley is also home to the Chabot Space & Science Center, which features exhibits on astronomy, space exploration, and the natural world.

Science

    •   The Lawrence Livermore National Laboratory, a major research facility, is located in nearby Livermore.

    •   The University of California, Berkeley's Seismological Laboratory has a research station in Castro Valley to monitor seismic activity on the Hayward Fault.

Personalities

    •   Joaquin Castro, the namesake of Castro Valley, was a Mexican military officer who received a land grant in the area in 1834.

    •   John Muir, the renowned naturalist and conservationist, visited Castro Valley in 1872 and was impressed by its natural beauty.

    •   The actress and singer Doris Day lived in Castro Valley in the 1950s and 1960s.

Tourist Attractions
1.Lake Chabot Regional Park:

A scenic park featuring a large lake for fishing, boating, and swimming, as well as hiking trails, picnic areas, and a nature center.

2.Redwood Regional Park:

A vast park known for its towering redwood trees, offering hiking trails, picnic areas, and a visitor center with exhibits on the park's history and ecology.

3.Castro Valley Community Center:

A multipurpose facility that hosts a variety of events, classes, and programs, including fitness classes, art exhibitions, and community gatherings.

Nearby Cities:

Hayward, CA
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San Lorenzo, CASan Leandro, CA
Union City, CADublin, CA
San Ramon, CADanville, CA
Moraga, CAFremont, CA
Newark, CAAlameda, CA
Alamo, CAPleasanton, CA
Diablo, CAPiedmont, CA
San Jose, CA
San Francisco, CASacramento, CA
Stockton, CAModesto, CA
Santa Rosa, CAElk Grove, CA
Salinas, CASunnyvale, CA
Roseville, CAConcord, CA
Santa Clara, CA