◆ OAK BROOK, IL HAIL HISTORY · DU PAGE COUNTY
Oak Brook, IL hail history & hail map
Oak Brook, Illinois has had 4 hail events in the past 5 years, with hail up to 4.00″ (Softball). Most recent: Jul 28, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
4Hail events in the past 5 years
4.00″Largest recorded hail · Softball
4.00″Largest ground report (within 3 mi)
1.50″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Oak Brook, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Oak Brook
| Date | Peak hail | Sources |
|---|---|---|
| Jul 28, 2026 | 2.00″ Golf Ball | 1 ground report (max 2.00″) |
| Jul 27, 2026 | 2.75″ Baseball | Radar 1.50″ · 19 ground reports (max 2.75″) |
| Mar 31, 2026 | 1.75″ Golf Ball | Radar 1.50″ · 4 ground reports (max 1.75″) |
| Mar 10, 2026 | 4.00″ Softball | 1 ground report (max 4.00″) |
More Illinois hail history
All Illinois cities & hail days →
Events count days with NOAA MRMS radar hail over Oak Brook (41.830, -87.950) or an NWS / CoCoRaHS hail report within 3 miles. Data window: NOAA MRMS radar hail swaths Oct 2021 – Nov 2026; NWS / NCEI Storm Events reports Nov 2024 – Jul 2026; CoCoRaHS volunteer reports Oct 2021 – present. Radar hail sizes are estimates, not ground truth; hail at any single address can differ.