Illinois · September 21, 2025

Illinois hail map — September 21, 2025

NOAA radar detected hail of an inch or more over 3 Illinois cities on September 21, 2025. The largest stones — 1.00″, quarter size — fell over Crystal Lake.

Hail swath map for Crystal Lake, IL on September 21, 2025 showing 1.00 inch hail.
Swath over Crystal Lake on September 21, 2025 — 1.00″ hail. Each city below has its own map for this storm.
Cities hit
3
in Illinois
Largest stone
1.00″
quarter size
Impact rating
3/10
from stone size

Sizes come from NOAA MRMS radar (MESH), which runs about ±0.25″ against ground truth. It is canvass-targeting quality, not claim evidence.

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Illinois cities hit on September 21, 2025

Crystal Lake, IL1.00″ · quarterRound Lake Beach, IL1.00″ · quarterMcHenry, IL1.00″ · quarter

What people on the ground measured in Illinois on September 21, 2025

One report filed with the National Weather Service. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

  • 1.25″ half dollar size Public
    Matteson, IL3:38 PM CDTCook County

    Photo shared on social media showing 1 to 1.25 inch hail. Time estimated by radar.

Reports come from the National Weather Service Local Storm Report feed, ingested every 15 minutes. A report records where the observer was, not the full extent of the swath — treat it as evidence about the storm, not about any one roof.

Other states hit on September 21, 2025

Texas4 cities · 2.00″Minnesota16 cities · 2.00″Louisiana2 cities · 1.00″Oklahoma2 cities · 1.00″Kansas1 city · 1.00″
The full US hail map for September 21, 2025 →

Other Illinois hail days

August 13, 20263 cities · 1.00″August 11, 20263 cities · 1.00″August 9, 202640 cities · 1.50″July 27, 2026127 cities · 2.00″July 10, 20262 cities · 1.00″July 4, 20261 city · 1.50″July 3, 202618 cities · 1.00″July 2, 202614 cities · 1.00″June 24, 202614 cities · 1.50″June 17, 20264 cities · 2.00″June 11, 20261 city · 1.00″June 10, 202614 cities · 1.00″
Every hail day across Illinois →
FAQ

Illinois hail on September 21, 2025

NOAA radar put hail of an inch or more over 3 Illinois cities that day. The largest stones — 1.00 inches, quarter size — were over Crystal Lake. Every city hit is listed above with its own stone size.

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