Our Proprietary 10-Day Forecast

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Current warnings over Grayslake, Illinois
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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 Grayslake, Illinois 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 Grayslake, Illinois 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 Lake County, IL

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 Grayslake, Illinois

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 Grayslake, IL 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 Grayslake, IL

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 Grayslake, IL, 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 Grayslake, Illinois

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 Lake County, Illinois

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:
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  • 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)
Grayslake, Illinois has a humid continental climate, characterized by hot, humid summers and cold, snowy winters. The city experiences all four seasons, with average temperatures ranging from 20°F in January to 75°F in July.

Summer


    •   Average high temperature: 80°F (27°C)
    •   Average low temperature: 60°F (16°C)
    •   Precipitation: 3.5 inches (8.9 cm) per month

Winter


    •   Average high temperature: 30°F (-1°C)
    •   Average low temperature: 15°F (-9°C)
    •   Precipitation: 2.5 inches (6.4 cm) per month

Spring


    •   Average high temperature: 55°F (13°C)
    •   Average low temperature: 35°F (2°C)
    •   Precipitation: 3.0 inches (7.6 cm) per month

Fall


    •   Average high temperature: 65°F (18°C)
    •   Average low temperature: 45°F (7°C)
    •   Precipitation: 2.5 inches (6.4 cm) per month

Precipitation


    •   Grayslake receives an average of 35 inches (89 cm) of precipitation per year, which is evenly distributed throughout the year.
    •   The city experiences occasional thunderstorms in the summer and snowfall in the winter.

Humidity


    •   Grayslake has a humid climate, with average humidity levels ranging from 60% to 80%.
    •   The humidity can make summers feel hotter and winters feel colder.

Wind


    •   The prevailing wind direction in Grayslake is from the west.
    •   Wind speeds average 10 miles per hour (16 km/h) throughout the year.

Climate Change


    •   Grayslake, like many cities in the Midwest, is experiencing the effects of climate change.
    •   The city has seen an increase in average temperatures, more extreme weather events, and changes in precipitation patterns.

Overall, Grayslake has a temperate climate with four distinct seasons. The city experiences hot, humid summers and cold, snowy winters, with mild spring and fall seasons.

Facts & Historical Information
(made with AI, use with caution)
Grayslake, Illinois, is steeped in natural and scientific history:

  • Grayslake Glacial Park:

    This 1,100-acre park preserves the remnants of the last glacier to cover the area, forming unique landforms like kames and eskers.

  • Chiwaukee Prairie:

    Grayslake is home to a portion of this globally significant prairie, supporting over 200 plant species and numerous insects, birds, and mammals.

  • William Rainey Harper College:

    Founded in 1965, this community college has a strong focus on science and technology, with programs in fields like biotechnology and environmental science.

  • Dr. Charles Graeser:

    A prominent early settler, Dr. Graeser established a botanical garden and arboretum in Grayslake, introducing many exotic plant species to the area.

  • Fermi National Accelerator Laboratory (Fermilab):

    Located nearby, Fermilab is a world-renowned particle physics research center, home to the Large Hadron Collider, which has made groundbreaking discoveries about the fundamental nature of matter.

    • Tourist Attractions
    1. Six Flags Great America: A renowned amusement park featuring thrilling roller coasters, water rides, and live entertainment.

    2. Volo Auto Museum: A unique museum showcasing an extensive collection of classic and vintage automobiles, motorcycles, and military vehicles.

    3. Lake County Discovery Museum: An interactive children's museum offering hands-on exhibits on science, technology, and the arts.

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