How big was the hail on August 18, 2025?

The maximum estimated stone size anywhere in South Dakota that day was 1.00 inches. Sizes vary street to street inside a single swath, so a city's figure is the largest radar estimated anywhere within about 5 miles of it.

Does this mean roofs were damaged?

Radar measures stone size, not damage. Whether a particular roof was damaged depends on stone size, wind direction, roof age and material — only an inspection settles it. These figures tell you where it is worth looking.

How do I see the actual swath on a map?

A HailMate plan puts the whole of South Dakota on a real interactive map with this swath and three years of others already on it. $79/mo, and the canvassing tools come with it.

South Dakota · August 18, 2025

South Dakota hail map — August 18, 2025

Name: South Dakota hail map — August 18, 2025
Creator: HailMate

NOAA radar detected hail of an inch or more over 1 South Dakota city on August 18, 2025. The largest stones — 1.00″, quarter size — fell over Rapid City.

Hail swath map for Rapid City, SD on August 18, 2025 showing 1.00 inch hail. — Swath over Rapid City on August 18, 2025 — 1.00″ hail. Each city below has its own map for this storm.

Cities hit: 1; in South Dakota
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.

Roofing contractors

Work South Dakota on the live hail map

HailMate's canvassing map: hail swaths colour-banded by stone size, from yellow through red to purple, laid over a satellite view of a Texas territory, with hail swath and territory controls.

All of South Dakota at street level, with this storm already on it
Three years of hail swaths, filterable by stone size
GPS door-knocking, pins, jobs and estimates — the full loop, not a preview
Month-to-month, cancel anytime

Get started

One state, one user, everything included. $79/mo, cancel anytime.

Homeowners

Did hail hit your address?

This page covers South Dakota as a whole. Check your own address to see every storm on record for your roof — the date and the stone size for each one — and we'll email you the full report to keep.

Check my address

Free, and no account needed to look it up. If hail did hit, you can ask for a free inspection from a vetted local roofer.

South Dakota cities hit on August 18, 2025

Rapid City, SD1.00″ · quarter

What people on the ground measured in South Dakota on August 18, 2025

9 reports filed with the National Weather Service — 4 from trained spotters or officials. These are measured stones, not radar estimates, so they are the closest thing to proof that hail actually reached the ground.

3.25″ baseball size Co-Op Observer
1 ESE Pactola Res, SD3:55 PM CDTPennington County
3.00″ baseball size Trained Spotter
2 NE Silver City, SD3:40 PM CDTPennington County
Measured 2 to 3 inch hail stones.
2.50″ hen egg size NWS Employee
1 N Hisega, SD4:10 PM CDTPennington County
Rear window of vehicle has several holes in it.
1.50″ half dollar size Public
Johnson Siding, SD4:00 PM CDTPennington County
mPING report
1.50″ half dollar size Public
7 ESE Hermosa, SD5:26 PM CDTCuster County
1.00″ quarter size Trained Spotter
1 NNW Nemo, SD3:15 PM CDTLawrence County
1/2 inch to 1 inch hail
1.00″ quarter size Public
5 SW Dwtn Rapid City, SD4:27 PM CDTPennington County
mPING report
1.00″ quarter size NWS Employee
4 S Dwtn Rapid City, SD4:37 PM CDTPennington County
mPING report
0.75″ penny size Public
3 N Sheridan Lake, SD4:07 PM CDTPennington County
mPING report

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 August 18, 2025

Texas3 cities · 1.00″Oklahoma1 city · 1.00″Florida1 city · 1.00″Missouri1 city · 1.00″

The full US hail map for August 18, 2025 →

Other South Dakota hail days

August 18, 20261 city · 1.50″August 16, 20261 city · 1.00″August 11, 20261 city · 1.00″August 7, 20261 city · 1.00″July 24, 20261 city · 1.00″July 6, 20261 city · 1.00″July 4, 20261 city · 1.00″July 1, 20261 city · 1.00″June 22, 20261 city · 1.50″May 24, 20261 city · 1.00″May 17, 20261 city · 1.50″February 28, 20261 city · 1.00″

Every hail day across South Dakota →

FAQ

South Dakota hail on August 18, 2025

NOAA radar put hail of an inch or more over 1 South Dakota city that day. The largest stones — 1.00 inches, quarter size — were over Rapid City. Every city hit is listed above with its own stone size.

Knock the South Dakota streets this storm hit

Your whole state at street level, with this swath already on the map — $79/mo, cancel anytime.

One state, everything included · from $79/mo · month-to-month, cancel anytime