National Weather Service United States Department of Commerce

‚ÄčHot temperatures and very high dew point temperatures persisted over southern Wisconsin from Thursday, July 21st through Sunday, July 24th, 2016. Excessive Heat Warnings and Heat Advisories were issued throughout this four-day period due to dangerous heat conditions across the area. This page summarizes the maximum heat index values, along with the highs and lows experienced during this period.

Maximum Heat Index Values:

The all-important heat index values are the measure of what it "feels-like" outside, taking both the temperatures and humidity into account. Some of these values got very high, especially on Sunday. Below is a table showing the progression of the heat index values. Southern Wisconsin saw heat index values in the lower to mid 100s in some locations, with some places seeing heat indices breaking 110 Fahrenheit in extreme southeastern Wisconsin on Sunday. Dew point temperatures were consistently in the upper 60s and lower 70s, with some of the highest dew point temperatures in the upper 70s and even into the lower 80s in some spots Sunday- down right muggy!

Click each image below to enlarge.

Thursday Friday Saturday Sunday
Thursday Maximum Heat Index Friday Maximum Heat Index Saturday Maximum Heat Index Sunday Maximum Heat Index



High temperatures generally ranged from lower to mid 90s for most places, well above the average high of 81 for southern Wisconsin. Interestingly, the cause for the lower temperatures in our western counties on Saturday was due to thunderstorms that brought cloud cover and rainfall to help keep them cooler than what they could have been. Temperatures in our east were higher despite being closer to Lake Michigan due to the thunderstorms holding off until after the peak heating of the day.

Click each image below to enlarge.

Thursday Friday Saturday Sunday
Thursday High Temperatures Friday High Temperatures Saturday High Temperatures Sunday High Temperatures



Even overnight, the temperatures were well above average. The low temperatures generally dropped to only the upper 60s and lower 70s, with some locations staying in the mid 70s for their lows.

Click each image below to enlarge.

Thursday Friday Saturday Sunday
Thursday Low Temperatures Friday Low Temperatures Saturday Low Temperatures Sunday Low Temperatures


This week should bring more seasonal temperatures and humidities- very welcome conditions after the tropical weekend we have just experienced.



NWS Milwaukee/Sullivan