Heat stress in Milwaukee
Lake Michigan cools the shore, but inland humid heat events drive real summer risk.
Heat stress is low right now — normal outdoor activity is fine.
Wet-bulb globe temperature via the Liljegren (2008) method. This page is cached and refreshes in the background, so the live badge below can be a few minutes ahead of it.
View Milwaukee on the live mapOutdoor plans are fine. Normal hydration is enough for anyone in good health.
Screening guidance from ACGIH TLV, GHSA/KSI/NATA, and TB MED 507. WBGT is a composite index, not air temperature. These are acclimatized-population defaults — the unacclimatized, older, ill, or those on certain medications are at higher risk. Not a substitute for a required on-site WBGT reading or your employer / league / command policy.
Reading heat stress in Milwaukee
Wet-bulb globe temperature (WBGT) is the heat measure that actually tracks danger to the body. Unlike the plain air temperature on your phone, it folds in humidity, wind, and direct sun — the factors that decide whether your sweat can still cool you. It’s the standard the military, athletic associations, and occupational-safety bodies use to call when outdoor activity is no longer safe.
That matters in Milwaukee because lake Michigan cools the shore, but inland humid heat events drive real summer risk. The number above is the live outdoor WBGT for the city right now; tap through to the live map to inspect any neighborhood, scrub the forecast hour by hour, and see the 7-day outlook.
How hot Milwaukee usually gets
Across 2015–2024, Milwaukee averaged a 77°F daily high in summer — among the lower summer highs we track, and July is typically the warmest month.
Humidity is the real story here — summer averages about 73%, so sweat evaporates poorly and heat stress runs well above what the temperature alone suggests.
Daily high temperatures and humidity from ERA5 reanalysis, 2015–2024 (hottest day in the sample: 2023-08-23). These are climate averages for context — the reading at the top of this page is the live one.
Heat in Milwaukee: common questions
How hot does it usually get in Milwaukee?
Across 2015–2024, Milwaukee averaged a 77°F daily high through summer, with about 6 days a year at or above 90°F. July is typically the hottest month, and the hottest day in that sample reached 100°F. Figures are from ERA5 daily reanalysis.
When is the hottest time of year in Milwaukee?
July has the highest average daily high in Milwaukee. Humidity is the real story here — summer averages about 73%, so sweat evaporates poorly and heat stress runs well above what the temperature alone suggests. Use the forecast on this page to plan around the specific days that matter.
What is the WBGT in Milwaukee right now?
The reading at the top of this page is the current wet-bulb globe temperature for Milwaukee, Wisconsin, computed from live weather by the Liljegren (2008) method and labelled with how recently it updated. For an exact reading at your own neighbourhood, plus an hour-by-hour forecast, open the live map.
Why is WBGT more useful than the temperature for Milwaukee?
Air temperature ignores humidity, wind, and sun — the things that decide whether heat is dangerous. Milwaukee's climate (lake Michigan cools the shore, but inland humid heat events drive real summer risk.) is exactly why a single "feels-like" or thermometer reading can understate the real risk. WBGT captures all of it in one number.
When is heat most dangerous in Milwaukee?
Heat stress typically peaks in the early-to-mid afternoon, when sun load is highest. Plan strenuous outdoor activity for early morning or evening, hydrate ahead of time, and use the forecast scrubber on the live map to find the safest window.
Is WetBulbTracker free to use for Milwaukee?
Yes. WetBulbTracker is free, needs no account, and works for anywhere on Earth — not just Milwaukee. You can install it to your home screen and even set heat alerts.
Put Milwaukee’s live heat stress on your site
A self-updating WBGT badge for schools, teams, camps, and local sites — it always shows the current reading and links back here.
<iframe src="https://wetbulbtracker.com/embed/milwaukee-wi" width="340" height="150" style="border:0" title="Live WBGT — Milwaukee, WI" loading="lazy"></iframe>Paste it into any website. The badge updates itself and links back here. Add ?theme=light for light sites.