A warm front lifted north through the region late Friday night (6/20) into early Saturday morning (6/21) allowing daytime temperatures to soar into the lower to middle 90s with dew points in the middle to upper 70s Saturday (6/21) and Sunday (6/22) afternoon. The high of 94 at the Green Bay Airport on Sunday (6/22) tied the record high for the day.
Every event with a place to put it; 13 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
A warm front lifted north through the region late Friday night (6/20) into early Saturday morning (6/21) allowing daytime temperatures to soar into the lower to middle 90s with dew points in the middle to upper 70s Saturday (6/21) and Sunday (6/22) afternoon. The high of 94 at the Green Bay Airport on Sunday (6/22) tied the record high for the day. The combination of hot temperatures and high dew points allowed heat index values to soar to 105 to 110 degrees both days. Temperatures on Monday (6/23) again soared into the lower 90s with dew points in the lower 70s, pushing heat index values to 100 to 105 degrees. Several highways buckled due to the extreme heat on Sunday (6/23).
In addition to the hot temperatures, overnight lows only fell into the upper 70s Saturday night (6/21) into early Sunday morning (6/22) as well as Sunday night (6/22) into early Monday morning (6/23), providing minimal relief from the hot temperatures. The warm overnight temperatures set or tied new records for record high minimums across much of the area for Sunday (6/22). The high minimum values on Sunday (6/22) of 79 in Green Bay, 78 in Wausau, and 76 in Rhinelander each tied the all-time highest minimum temperatures on record for those locations. The heat wave broke when a cold front moved through the area Monday afternoon and evening (6/23) along with showers and thunderstorms.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before the first event at Jun 21, 1:07 PM CST, 43 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
13 excessive heat. Local standard time, as filed.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 106 degrees during the afternoon on Saturday and again on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 107 degrees during the late afternoon on Saturday and 106 degrees Sunday afternoon.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 105 degrees during the afternoon on Saturday and again on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 106 degrees during the late afternoon on Saturday and 105 degrees Sunday afternoon.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 108 degrees during the afternoon on Saturday and again on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 105 degrees during the afternoon on Saturday and again on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 106 degrees during the late afternoon on Saturday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 107 degrees during the late afternoon on Saturday and 105 degrees Sunday afternoon.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 107 degrees during the late afternoon on Saturday and 106 degrees Sunday afternoon.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 105 degrees during the afternoon on Saturday and again on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 108 degrees during the late afternoon on Saturday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 108 degrees during the afternoon on Sunday.
The combination of hot temperatures and high humidity caused heat index values to rise as high as 105 degrees during the afternoon on Sunday.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2025Every state in 2025This day in weather historyWarnings in Wisconsin, June 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1255148, 1255142, 1255143, 1255150, 1257533, 1255144, 1255145, 1255140, 1255146, 1255147, 1255141, 1255225, 1255339.