Our Proprietary 10-Day Forecast

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Current warnings over Vandalia, 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 Vandalia, 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 Vandalia, 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 Fayette 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 Vandalia, 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 Vandalia, 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 Vandalia, 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 Vandalia, 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 Vandalia, 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 Fayette 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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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)
Vandalia, Illinois is located in the Midwestern United States and has a humid continental climate. The city experiences four distinct seasons, with hot and humid summers, cold and snowy winters, and mild spring and fall seasons.

Summer

Summer in Vandalia typically lasts from June to August and is characterized by hot and humid weather. Average high temperatures during this time range from 85°F to 90°F (29°C to 32°C), and average low temperatures range from 65°F to 70°F (18°C to 21°C). The humidity levels are often high, making the air feel even hotter. Thunderstorms are common during the summer months, and occasionally severe thunderstorms can occur, bringing heavy rain, strong winds, and hail.

Winter

Winter in Vandalia typically lasts from December to February and is characterized by cold and snowy weather. Average high temperatures during this time range from 30°F to 35°F (-1°C to 2°C), and average low temperatures range from 15°F to 20°F (-9°C to -7°C). Snowfall is common during the winter months, with an average of 20 inches (51 cm) of snow falling each year. The city can also experience occasional ice storms, which can cause power outages and travel disruptions.

Spring and Fall

Spring and fall in Vandalia are typically mild and pleasant. Spring typically lasts from March to May and is characterized by gradually warming temperatures and increasing amounts of sunshine. Average high temperatures during this time range from 50°F to 70°F (10°C to 21°C), and average low temperatures range from 30°F to 45°F (-1°C to 7°C). Fall typically lasts from September to November and is characterized by gradually cooling temperatures and changing leaves. Average high temperatures during this time range from 60°F to 75°F (16°C to 24°C), and average low temperatures range from 40°F to 50°F (4°C to 10°C).

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

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

    •   Vandalia lies within the fertile Kaskaskia River Valley, known for its rich soil and diverse plant life.

    •   The area was once home to vast prairies, teeming with buffalo, deer, and other wildlife.

    •   The Kaskaskia River, a tributary of the Mississippi, provided a vital waterway for transportation and sustenance.

Science

    •   In 1823, Vandalia became the first state capital of Illinois, hosting the Illinois State Museum, which showcased natural history specimens.

    •   The city was a hub for scientific exploration, with notable figures such as John James Audubon and Joseph Nicollet conducting research in the surrounding areas.

Personalities

    •   Pierre Menard, a French-American fur trader, was a prominent figure in Vandalia's history. He served as the first lieutenant governor of Illinois and played a key role in the development of the city.

    •   Ninian Edwards, the second governor of Illinois, resided in Vandalia and oversaw the construction of the Illinois State Capitol Building.

    •   The city was also home to Stephen A. Douglas, a renowned politician who debated Abraham Lincoln in the famous Lincoln-Douglas debates.

Tourist Attractions
1. Vandalia Statehouse State Historic Site: This historic site is the former state capitol of Illinois and offers a glimpse into the state's early history. Visitors can tour the restored statehouse, learn about the history of Vandalia, and explore the surrounding grounds.

2. Fayette County Museum: This museum is dedicated to preserving the history of Fayette County, Illinois. Visitors can view exhibits on local history, culture, and industry. The museum also has a research library and archives.

3. Vandalia Lake: This 100-acre lake is a popular spot for fishing, boating, and swimming. Visitors can also enjoy picnicking, hiking, and camping in the surrounding park.

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