Hail and tornadoes in Waukesha County, WI

Since January 2021, radar estimated hail somewhere in Waukesha County, WI on 49 days. The biggest estimate: 2 in or larger (hen egg), on Mon, Jul 27, 2026. Hail was reported to the National Weather Service inside the county on 17 days.

Still loading: radar estimates go back to Wed, Oct 14, 2020, and the earlier years are being added.

Days with hail

since January 2021

1 inch or larger

days, estimated or reported

Largest radar estimate

2+ in

Mon, Jul 27, 2026

Largest reported

2.5 in

Mon, Jul 27, 2026

Radar estimates are NOAA's MESH: the largest hail the radar estimates aloft, on cells about 0.7 mile across, shown as the lower bound of a size band (“1.5+”). They often run larger than what reached the ground, and they aren't evidence of damage at any address.

Hail on record since 1955

NOAA's Storm Events database lists 209 hail reports in Waukesha County, WI on 79 days, 15 of them 2 inches or larger. The largest: 3.75 in, near Mukwonago, on Sun, Aug 2, 2015.

By decade: 2000s: 52 · 2010s: 58 · 2020s: 99

Tornadoes since 1950

17 tornadoes have touched Waukesha County, WI since 1950, none of them rated F3/EF3 or stronger. They killed 0 and injured 15.

Strongest

Tue, Apr 14, 2026 · EF2 · 3.78 mi long, 150 yd wide · near Merton
Thu, Jul 22, 2010 · EF2 · 1 mi long, 100 yd wide · near Big Bend
Mon, Jun 21, 2010 · EF2 · 5.22 mi long, 880 yd wide · near Eagle · 15 injuries
Fri, Jul 28, 2023 · EF1 · 0.46 mi long, 90 yd wide · near Eagle
Fri, Mar 31, 2023 · EF1 · 0.28 mi long, 50 yd wide · near Eagle

Most recent

Fri, Apr 17, 2026 · EF0 · 0.62 mi long, 70 yd wide · near Muskego Lake
Tue, Apr 14, 2026 · EF2 · 3.78 mi long, 150 yd wide · near Merton
Fri, Jul 28, 2023 · EF1 · 0.46 mi long, 90 yd wide · near Eagle
Fri, Mar 31, 2023 · EF1 · 0.28 mi long, 50 yd wide · near Eagle
Wed, Oct 12, 2022 · EF0 · 0.61 mi long, 50 yd wide · near Nashotah
Thu, Jul 29, 2021 · EF1 · 0.88 mi long, 95 yd wide · near Bethesda
Thu, Jul 29, 2021 · EF0 · 2.44 mi long, 50 yd wide · near Lapham Peak State Park
Thu, Jul 29, 2021 · EF1 · 1.03 mi long, 75 yd wide · near Utica
Thu, Jul 29, 2021 · EF1 · 2.73 mi long, 150 yd wide · near Utica
Tue, Oct 1, 2019 · EF1 · 8.47 mi long, 100 yd wide · near Utica

By decade: 2000s: 2 · 2010s: 6 · 2020s: 9

Still loading: NOAA's record goes back to 1950, and 2003 onward is in so far.

Every hail day since January 2021

Thu, Sep 3, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Wed, Sep 2, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sun, Aug 9, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1.25 in (2 E Mukwonago, WI)
- 1 in (1 SW Mukwonago, WI)
Mon, Jul 27, 2026
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county
- 1 in (1 S Delafield, WI)
- 2 in (1 NE Oconomowoc, WI)
- 2.5 in (1 W Oconomowoc, WI)
- 1.75 in (1 ESE Lac La Belle, WI)
Thu, Jul 2, 2026
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Fri, Apr 17, 2026
Radar estimate anywhere in the county: 0.75 in or larger (penny)
Reported in the county
- 1 in (Eagle, WI)
Tue, Apr 14, 2026
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county
- 1 in (1 W Oconomowoc, WI)
- 2 in (2 NNE Menomonee Falls, WI)
- 2 in (2 N Menomonee Falls, WI)
Tue, Dec 30, 2025
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Sun, Dec 14, 2025
Radar estimate anywhere in the county: 2 in or larger (hen egg)
No hail reported in the county.
Mon, Sep 22, 2025
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Mon, Aug 11, 2025
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sat, Aug 9, 2025
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Thu, May 15, 2025
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county
- 1 in (1 W Dousman, WI)
- 1.25 in (Mukwonago, WI)
- 2 in (Big Bend, WI)
- 1 in (1 SW Lac La Belle, WI)
- 1.5 in (Eagle, WI)
Fri, Apr 18, 2025
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 2 in (1 E North Prairie, WI)
- 1 in (1 E New Berlin, WI)
- 1 in (3 S New Berlin, WI)
- 1 in (1 ENE Lac La Belle, WI)
Wed, Sep 11, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Tue, Aug 27, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Thu, Aug 1, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sun, Jul 21, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sun, Jul 7, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Mon, Jun 24, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1 in (Merton, WI)
- 1.25 in (Brookfield, WI)
Mon, Jun 17, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Mon, May 13, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Tue, May 7, 2024
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1 in (1 W Pewaukee, WI)
- 1 in (Mukwonago, WI)
Sat, May 4, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Mon, Mar 4, 2024
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Thu, Feb 8, 2024
Reported in the county
- 1 in (3 NNE Chenequa, WI)
- 1.5 in (1 SE Oconomowoc, WI)
- 1 in (Menomonee Falls, WI)
Thu, Aug 24, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Wed, Aug 16, 2023
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Fri, Jul 28, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1.25 in (Mukwonago, WI)
Sun, Jul 23, 2023
Radar estimate anywhere in the county: 1.5 in or larger (ping-pong ball)
No hail reported in the county.
Wed, May 31, 2023
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1 in (1 WSW Delafield, WI)
Thu, Apr 20, 2023
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Wed, Apr 19, 2023
Reported in the county
- 1 in (3 NNE LAC LA BELLE, WI)
Fri, Nov 4, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Tue, Sep 20, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
Reported in the county
- 1.5 in (2 WNW SUSSEX, WI)
Sat, Jul 23, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Fri, Jul 22, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Tue, Jul 5, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Mon, Jun 13, 2022
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county
- 1.75 in (NORTH PRAIRIE, WI)
- 1.75 in (2 WSW OCONOMOWOC, WI)
Fri, Jun 10, 2022
Radar estimate anywhere in the county: 2 in or larger (hen egg)
Reported in the county
- 1.75 in (OCONOMOWOC, WI)
Thu, May 26, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Mon, Jan 17, 2022
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Wed, Sep 29, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Mon, Sep 13, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
Reported in the county
- 1 in (1 S OCONOMOWOC, WI)
Sun, Sep 12, 2021
Radar estimate anywhere in the county: 1.5 in or larger (ping-pong ball)
Reported in the county
- 1 in (3 NNE LANNON, WI)
Tue, Sep 7, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sat, Aug 28, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Tue, Aug 24, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sat, Aug 7, 2021
Radar estimate anywhere in the county: 0.75 in or larger (penny)
No hail reported in the county.
Sat, Jun 19, 2021
Radar estimate anywhere in the county: 1 in or larger (quarter)
No hail reported in the county.
Fri, Jun 11, 2021
Radar estimate anywhere in the county: 1.5 in or larger (ping-pong ball)
No hail reported in the county.

Check your own address →Weather in Waukesha County, WI now →Get warned before the next storm →

Radar estimates and reports are for anywhere inside the county's boundary. Radar estimates come from NOAA's MRMS estimated hail size (MESH), the largest hail the radar estimates aloft on a ~1 km grid. They often run larger than the hail that reached the ground, and they aren't an observation at any address. Reports are what people reported to the National Weather Service. Neither is proof of damage or an official record for an insurance claim. From NOAA's Storm Events Database (NCEI), which records tornadoes from 1950, hail and thunderstorm wind from 1955, and every kind of storm from 1996. A tornado that crossed county lines is counted in each county it touched. Recent months are added as NCEI publishes them, a few months behind. Damage is in the dollars of its year and is often an estimate.