Our Proprietary 10-Day Forecast

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Current warnings over Decatur, 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 Decatur, 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 Decatur, 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 Macon 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 Decatur, 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 Decatur, 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 Decatur, 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 Decatur, 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 Decatur, 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 Macon 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.
 
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  • 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.
 
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Climate Summary
(made with AI, use with caution)
Decatur, Illinois experiences a continental climate, characterized by hot, humid summers and cold, dry winters. Here's a summary of the climate conditions in Decatur:

Temperature


    •   Average Annual Temperature: 53.2°F (11.8°C)
    •   Average Summer Temperature (June-August): 75.8°F (24.3°C)
    •   Average Winter Temperature (December-February): 28.6°F (-1.9°C)
    •   Record High Temperature: 117°F (47.2°C)
    •   Record Low Temperature: -35°F (-37.2°C)

Precipitation


    •   Average Annual Precipitation: 38.36 inches (974.4 mm)
    •   Average Snowfall: 21.3 inches (54.1 cm)
    •   Wettest Month: May (4.33 inches or 110 mm)
    •   Driest Month: February (1.73 inches or 44 mm)

Humidity


    •   Average Annual Humidity: 72%
    •   Highest Humidity: July (79%)
    •   Lowest Humidity: January (64%)

Wind


    •   Average Wind Speed: 11.0 mph (17.7 km/h)
    •   Prevailing Wind Direction: Southwest

Sunshine


    •   Average Annual Sunshine Hours: 2,560 hours
    •   Sunniest Month: July (310 hours)
    •   Cloudiest Month: December (140 hours)

Seasons


    •   Spring (March-May): Mild temperatures, increasing precipitation, and occasional thunderstorms.
    •   Summer (June-August): Hot and humid, with high temperatures often exceeding 90°F (32°C).
    •   Fall (September-November): Gradually cooling temperatures, decreasing humidity, and occasional frost.
    •   Winter (December-February): Cold and dry, with occasional snowfall and icy conditions.

Climate Extremes


    •   Decatur is prone to severe weather events, including tornadoes, hailstorms, and derechos.
    •   The city has experienced significant flooding events, particularly along the Sangamon River.
    •   Decatur is located in USDA plant hardiness zone 5b, indicating that it is suitable for a wide range of plants and vegetation.

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

    •   Decatur is home to the Scovill Zoo, the oldest zoo in Illinois, established in 1903.

    •   The city boasts the Rock Springs Nature Center, a 3,000-acre preserve featuring diverse ecosystems, including wetlands, prairies, and forests.

Science

    •   Decatur was the birthplace of Dr. Silas Weir Mitchell, a renowned neurologist and author who pioneered the use of electricity in medicine.

    •   The city is home to the Archer Daniels Midland Company (ADM), a global leader in agricultural processing and biotechnology.

Personalities

    •   Decatur was the boyhood home of actor Dick Van Dyke, known for his roles in \

Tourist Attractions
1.Lincoln Home National Historic Site:

The former home of Abraham Lincoln, this site offers a glimpse into the life and times of the 16th President of the United States.

2.Millikin University:

A private liberal arts university with a beautiful campus and a variety of cultural and athletic events.

3.Rock Springs Nature Center:

A 330-acre nature preserve with hiking trails, a visitor center, and a variety of educational programs.

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