Weather forecast in Illinois Beach State Park (IL)

This data display current weather and forecast for the coming days in Illinois Beach State Park. In addition to temperature, wind, humidity and pressure, we include data on the probability of precipitation so you can have all the information about your destination before your trip.

Illinois Beach State Park current temperature and weather

September 13, 2025

Night
67.6°F Feels like: 67.6°F	Clear
	Wind: 6.9 mph (11.2 Km/h) S Pressure: 30.06 inHg (1018 hPa) Humidity: 75%	Precip. prob.: 0% Visibility: 6 mi (10 km) UV index: 0
Morning
71.2°F Feels like: 71.2°F	Sunny
	Wind: 4.9 mph (7.9 Km/h) S Pressure: 30.04 inHg (1017 hPa) Humidity: 73%	Precip. prob.: 0% Visibility: 3 mi (5 km) UV index: 0.6
Day
78.3°F Feels like: 81°F	Cloudy
	Wind: 7.2 mph (11.5 Km/h) S Pressure: 29.96 inHg (1015 hPa) Humidity: 65%	Precip. prob.: 0% Visibility: 6 mi (10 km) UV index: 3.8
Evening
73.8°F Feels like: 77.5°F	Clear
	Wind: 6 mph (9.7 Km/h) SE Pressure: 29.95 inHg (1014 hPa) Humidity: 80%	Precip. prob.: 0% Visibility: 6 mi (10 km) UV index: 0

Marine weather forecast Illinois Beach State Park

The graphs show wave heights and directions, as well as wind speed and direction in Illinois Beach State Park for the coming days. Click on the sea state chart for more details

In order for you to be able to estimate what the weather is like in Illinois Beach State Park throughout the year, we provide monthly data for the last few years. Select the month you are interested in.

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Our report for Illinois Beach State Park is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.