Our Proprietary 10-Day Forecast

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Current warnings over Locust Valley, New York
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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 Locust Valley, New York 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 Locust Valley, New York 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 Nassau County, NY

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 Locust Valley, New York

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 Locust Valley, NY 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 Locust Valley, NY

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 Locust Valley, NY, 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 Locust Valley, New York

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 Nassau County, New York

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)
Locust Valley, New York Climate Summary

Average Temperatures

| Month | Average High (°F) | Average Low (°F) |
|---|---|---|
| January | 37 | 22 |
| February | 41 | 25 |
| March | 49 | 32 |
| April | 60 | 42 |
| May | 71 | 51 |
| June | 80 | 61 |
| July | 85 | 67 |
| August | 82 | 65 |
| September | 74 | 56 |
| October | 63 | 45 |
| November | 51 | 35 |
| December | 41 | 27 |

Precipitation

    •   Average annual precipitation: 46 inches
    •   Average snowfall: 26 inches

Sunshine

    •   Average annual sunshine hours: 2,600

Humidity

    •   Average relative humidity: 68%

Wind

    •   Prevailing wind direction: Southwest
    •   Average wind speed: 10 mph

Climate Classification

    •   Köppen climate classification: Cfa (Humid subtropical climate)

Characteristics

    •   Warm, humid summers with frequent thunderstorms
    •   Mild, wet winters with occasional snow
    •   Moderate precipitation throughout the year
    •   Ample sunshine
    •   Relatively high humidity

Additional Notes

    •   Locust Valley is located on the north shore of Long Island, which experiences a moderating influence from the Atlantic Ocean.
    •   The area is prone to coastal storms, including hurricanes and nor'easters.
    •   Summers can be hot and humid, especially during heat waves.
    •   Winters can be cold and windy, with occasional snowstorms.

Facts & Historical Information
(made with AI, use with caution)
Locust Valley, NY, boasts a rich natural history and scientific legacy:

  • Locust Grove Estate:

    Once owned by famed inventor Alexander Graham Bell, the estate is now home to the Theodore Roosevelt Sanctuary and Audubon Center, which protects over 200 acres of diverse habitats.

  • Planting Fields Arboretum State Historic Park:

    This 409-acre park showcases over 1,000 species of trees and shrubs, including a massive Dawn Redwood dating back to the Jurassic period.

  • Cold Spring Harbor Laboratory:

    Founded in 1890, this world-renowned research institution has made significant contributions to genetics, genomics, and molecular biology, including the discovery of the double helix structure of DNA.

  • John Burroughs Nature Sanctuary:

    This 500-acre sanctuary preserves a pristine landscape of forests, meadows, and wetlands, providing habitat for a variety of wildlife. Burroughs, a renowned naturalist and writer, lived and worked here in the late 19th century.

  • Isaac Hicks House:

    Built in 1675, this historic Quaker farmhouse is a testament to the early settlement of Locust Valley and its Quaker heritage.

    • Tourist Attractions
    1. Planting Fields Arboretum State Historic Park: This 409-acre park features beautiful gardens, a historic mansion, and a variety of walking trails.

    2. Old Westbury Gardens: These formal gardens are spread across 200 acres and feature a variety of flowers, fountains, and sculptures.

    3. Sagamore Hill National Historic Site: This was the home of President Theodore Roosevelt and is now a museum that offers tours of the house and grounds.

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