Milwaukee

Milwaukee Under Extreme Heat Warning as Heat Index Could Reach 105 Degrees

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Published on June 20, 2025
Milwaukee Under Extreme Heat Warning as Heat Index Could Reach 105 DegreesSource: Google Street View

Milwaukee residents, brace yourselves for a sweltering weekend. According to the National Weather Service (NWS), Milwaukee, an Extreme Heat Warning is now in effect from noon tomorrow to 7 PM CDT Monday, anticipating heat index values surging up to a scorching 105 degrees. During this period, locals are advised to adopt measures to prevent heat-related illnesses – particularly staying hydrated, finding solace in air-conditioned spaces, and checking in on those who might be vulnerable to the heat's unforgiving clasp.

Meanwhile, today's forecast promises showers are likely before 1 pm, with a slight chance of thunderstorms occurring between 1 pm and 2 pm. After the downpour, conditions are expected to clear up, leading to a high near 81 degrees and southwest winds blowing 5 to 15 mph, gusts could reach up to 25 mph. Although the chance of precipitation is pegged at 60%, "new rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms," the NWS warns. Nighttime grants a brief respite with partly cloudy skies and lows hovering around 70 degrees.

For those heading to the beaches this weekend, caution is out. There's a moderate swim risk, as detailed by the Hazardous Weather Outlook released by the NWS. The combination of rough waters and the ongoing heatwave could create a dangerous scenario for less experienced swimmers or those unaware of the conditions. The Outlook also notes that tomorrow through Monday will be particularly oppressive with heat index values 'ranging from 100 to 105 degrees.'

Looking ahead, the forecast doesn't provide much of a cooldown. Sunday and Monday are set to sizzle, with highs near 95 and 93 degrees respectively. The NWS prompts locals to stay vigilant as "Heat headlines are in effect." By Monday night, the chance for showers and thunderstorms climbs to 40 percent, bringing potential relief but also raising concerns about severe weather. Residents should expect a blend of sunny, hot days interspersed with sporadic thunderstorms throughout the coming week, with precipitation chances hovering at 50 percent or above from Tuesday onward.