Understand the heat.
Prepare for your day.

Check estimated wet-bulb globe temperature (WBGT) based on local air temperature and humidity. A prompt to reassess your plans for outdoor activities and work on hot days.

Heat Safe Now · Available · View store detailsGoogle Play ↗Heat Safe Now · Available · View store detailsApp Store ↗

Google Play: 2026-11-10 · App Store: 2026-11-10

Heat Safe Now app screen — App screen · Japanese interface · Content varies with use

WHAT YOU CAN DO

Three features for everyday use.

FEATURE 01

Check current heat conditions

See estimated WBGT and heat risk calculated from the air temperature and humidity at your location.

FEATURE 02

Find practical guidance

Read guidance on safer actions, hydration and breaks according to the displayed risk level.

FEATURE 03

Available in six languages

The interface supports Japanese, English, Chinese, Korean, French and Spanish.

HOW TO USE

Getting started is simple.

01Get local information

Allow location access and check local weather data.

02Check estimated WBGT

Review the displayed risk level alongside air temperature and humidity.

03Plan activities with context

Consider breaks and hydration while also checking your health and actual surroundings.

QUESTIONS & ANSWERS

Frequently asked questions

Is the displayed WBGT a measured value?

It is estimated from weather data. Sunlight and surrounding conditions can make actual heat conditions different.

Can I download the Android version?

It is available on Google Play. Use the Google Play button on this page to download the currently published version.

What is location information used for?

It is used to obtain weather data near your current location. See the privacy policy for details.

For details, please see our Privacy policy ↗.

START YOUR DAY

Make Heat Safe Now part of your day.

Explore the app in a store where it is available.