Weatherstem
WBGT Monitoring

Know when it is safe for outdoor activities in the heat.

Take the guesswork out of wet bulb globe temperature monitoring for schools, athletics, and outdoor workers.

5 factorsTemperature, humidity, wind, solar radiation & more
State-specificHeat guidance built to local mandates
Multi-siteMonitor several points around one campus
What is WBGT

Wet Bulb Globe Temperature

For years, most officials relied on a metric called heat index to assess the severity of hot weather and how it may negatively impact people. While heat index combines temperature and humidity, WBGT also takes into account wind and solar radiation, giving a fuller picture of heat's real impact on the body.

Wet Bulb Globe Temperature (WBGT) equation showing its temperature, humidity, wind, and solar radiation components
The WBGT equation: how temperature, humidity, wind, and solar radiation combine into a single heat safety metric.
Learn More About WBGT
See it in action

Automated alerts and customizable heat guidance

Don't rely on a hand-held WBGT device or conditions miles from your location. Weatherstem WBGT monitoring can be tailored to your exact specifications based on mandates in your state.

Weatherstem WBGT dashboard showing automated heat alert thresholds and notifications
Automated alerts triggered by your own WBGT thresholds.
California state heat guidance chart mapped to WBGT activity levels
California heat guidance mapped to WBGT activity levels.
Georgia state heat guidance chart mapped to WBGT activity levels
Georgia heat guidance mapped to WBGT activity levels.
See State Heat Guidance Guides
Multi-site coverage

Monitor multiple locations around your campus

WBGT can vary greatly depending on multiple factors like elevation, wind speed, and cloud cover. Weatherstem can provide multiple monitoring options around your locations, so the number posted at one end of campus reflects what people actually experience at the other.

Video: WBGT variance measured across multiple monitoring points at NC State University.

Go deeper

Learn more about wet bulb globe temperature

Want to learn more about the difference between WBGT and heat index? Visit some of our insight blogs below.

Build your system

Pairs with the rest of the Weatherstem platform

Common questions

WBGT monitoring, answered

What is WBGT?

Wet Bulb Globe Temperature is a measure of heat's impact on the body and includes temperature, wind speed, solar radiation, pressure, and dewpoint.

Can WBGT vary significantly across small areas?

Yes, WBGT can vary widely across very small distances due to its dependence on multiple atmospheric conditions, which is why monitoring more than one point on a campus gives a more accurate picture than a single reading.

How is WBGT different from heat index?

Heat index combines temperature and humidity. WBGT goes further, also accounting for wind and solar radiation, giving a more complete measure of heat stress in outdoor conditions.

Do I need a hand-held device to measure WBGT?

No. Weatherstem WBGT monitoring removes the need for a hand-held device or estimates from conditions miles away, delivering readings and alerts tailored to your exact location and state mandates.

Proven impact

Trusted where a heat call carries real consequences

★★★★★
The Weatherstem system is a big step forward in assuring our students' health and wellbeing. The system is designed to alert our coaching staff of dangerous heat levels as well as nearby lightning so that practices and competitions can be altered.
Scott Nanik
Superintendent, Bret Harte Union High School District
★★★★★
We installed the weather station at the Fire Department training ground and use the wet bulb globe temperature during the summer to notify firefighters on the training ground of extreme heat and precautions they should take.
Mie Lucas
Augusta-Richmond County EMA

Ready to automate your heat safety decisions?

See how WBGT monitoring works for your locations, with automated alerts built around your state's guidance.

Book a Demo