Hail history for Oak Brook, Illinois
NOAA hail reports in and within about 5 km (3 miles) of Oak Brook since 2006, with preliminary reports to November 3, 2026.
Readout · Oak Brook
- Last hail
- Jul 27, 2026
- 2.00 in, hen egg size
- Hail days, last 5 years
- 2
- since Nov 3, 2021 · 3 reports
- Largest ever
- 2.00 in
- hen egg · Jul 27, 2026
13 reports on 10 days since 2006 · #231 of 378 Illinois places
Hail map · Oak Brook
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Oak Brook is from July 27, 2026. A local roofer can check and document it at no cost.
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What the record says about Oak Brook
The latest hail report in and around Oak Brook is from July 27, 2026, 2.00 in (hen egg size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 2.00 in on July 27, 2026.
Over the 20 years 2006–2025, Oak Brook logged 10 reports on 8 hail days, about 0.5 reports a year. That is about the same as the median Illinois town on this site (0.5 a year) and ranks #231 of 378 Illinois cities and towns on this site for all-time reports. Oak Brook accounts for 5% of the 281 reports filed in DuPage County.
8% of reports with a size were 2 inches (hen egg) or larger, against 4% for the median Illinois town on this site. The largest hail on record here is 2.00 in (hen egg) on July 27, 2026 near 0.69 S Oak Brook.
Reports were down 89% in 2016–2025 (1) compared with 2006–2015 (9). The busiest year was 2026, with 3 reports on 2 days. Hail here peaks in August (31% of reports); 31% fall between April and June.
Reports a year 2006–2025 average
- Oak Brook 0.5
- DuPage County 7.4
- Median Illinois town on this site 0.5
Hail days 2006–2025
- Oak Brook 8
- DuPage County 60
- Median Illinois town on this site 8
Share 2 in or larger of sized reports
- Oak Brook 8%
- DuPage County 5%
- Median Illinois town on this site 4%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 2 | 3 | ||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 27, 2026 | 2 | 2.00 in | — |
| Mar 30, 2026 | 1 | 1.75 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 27, 2026 | 2.00 inhen egg | 0.69 S Oak Brook | Du Page | 11:07 local · NCEI |
| Jul 27, 2026 | 1.75 ingolf ball | 0.06 SE Oak Brook | Du Page | 10:54 local · NCEI |
| Mar 30, 2026 | 1.75 ingolf ball | 2 WSW Oak Brook | Du Page | 22:00 local · NCEI |
| Aug 25, 2021 | 1.00 inquarter | 1 E Oakbrook Terrace | Du Page | 16:54 local · NCEI |
| Aug 13, 2011 | 1.00 inquarter | 0.65 NW Brandywine | Du Page | 13:04 local · NCEI |
Size of every report
- Under 1 in 6 46%
- 1–2 in 6 46%
- 2 in + 1 8%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 27, 2026 | 2.00 inhen egg | 0.69 S Oak Brook | Du Page | 11:07 local · NCEI |
| Jul 27, 2026 | 1.75 ingolf ball | 0.06 SE Oak Brook | Du Page | 10:54 local · NCEI |
| Mar 30, 2026 | 1.75 ingolf ball | 2 WSW Oak Brook | Du Page | 22:00 local · NCEI |
| Aug 25, 2021 | 1.00 inquarter | 1 E Oakbrook Terrace | Du Page | 16:54 local · NCEI |
| Aug 31, 2013 | 0.75 inpenny | 0.69 S Brandywine | Du Page | 10:32 local · NCEI |
| Nov 10, 2012 | 0.88 innickel | 0.69 S Brandywine | Du Page | 12:00 local · NCEI |
| Aug 13, 2011 | 1.00 inquarter | 0.65 NW Brandywine | Du Page | 13:04 local · NCEI |
| Aug 13, 2011 | 1.00 inquarter | 1.28 NNW Oak Brook | Du Page | 13:03 local · NCEI |
| Apr 19, 2011 | 0.88 innickel | Oak Brook | Du Page | 18:17 local · NCEI |
| Jun 23, 2010 | 0.88 innickel | Oak Brook | Du Page | 16:40 local · NCEI |
| Jun 23, 2010 | 0.88 innickel | 1.27 WNW Oak Brook | Du Page | 16:35 local · NCEI |
| Oct 2, 2006 | 0.75 inpenny | Clarendon Hills | Du Page | 12:16 local · NCEI |
Hail history near Oak Brook
- Villa Park 6 km · 10
- Downers Grove 7 km · 31
- Lombard 7 km · 13
- Glen Ellyn 10 km · 16
- Darien 10 km · 10
- Wheaton 13 km · 16
- Woodridge 13 km · 15
- Bedford Park 17 km · 14
Questions about hail in Oak Brook
How often does it hail in Oak Brook, Illinois?
13 hail reports have been logged in and within about 5 km (3 miles) of Oak Brook since 2006. Over the 20 years 2006–2025 that averages 0.5 reports a year. That ranks #231 of 378 Illinois places by number of reports.
When is hail season in Oak Brook?
Most reports come in August, April, June. August alone accounts for 31% of all reports.
What is the largest hail recorded in Oak Brook?
2.00 in (hen egg size) on July 27, 2026 near 0.69 S Oak Brook. 8% of reports here were 2 inches or larger.
When did it last hail in Oak Brook?
The most recent report in this data is from July 27, 2026 (2.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Oak Brook had in the last five years?
2 separate days with hail reports since November 3, 2021, adding up to 3 reports. The most recent was July 27, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.