Wet Bulb Temperature: WBGT
Heat Safety Index Tool
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
WBGT Heat shows the Wet Bulb Globe Temperature (WBGT) for your location, the heat-stress measure used by athletic trainers, the military, aviation, and workplace safety programs. Unlike a plain "feels like" number, WBGT combines temperature, humidity, wind, and direct sunlight to reflect the real strain heat puts on your body outdoors.
FEATURES
• Live outdoor WBGT for your current location or any city you search
• Color-coded flag levels (White, Green, Yellow, Red, Black) with heat categories
• Guidance tailored to your mode: Athlete, Military, Outdoors, Aviation, or OSHA
• Hourly and 14-day outlook, view WBGT, air temp, humidity, wind, solar radiation, cloud cover, and pressure
• Reference chart of flag categories and recommended activity levels
• Fahrenheit or Celsius
HOW IT WORKS
WBGT is estimated from local weather (temperature, humidity, wind, solar radiation, and pressure) using the scientific model of Liljegren et al. (2008). Flag categories follow the U.S. military WBGT heat-category system (NAVMED P-5010). Weather data is provided by Open-Meteo.
IMPORTANT
This app is for general informational purposes only and is not medical, safety, or professional advice. WBGT values are estimates that may differ from on-site measurements. Always use your own judgment, follow official guidance, and seek medical help for any signs of heat illness.
WBGT Pro is available as a monthly or annual auto-renewing subscription, or a one-time Lifetime unlock. The annual plan includes a 7-day free trial. Payment is charged to your Apple ID; subscriptions renew unless canceled at least 24 hours before the period ends. Manage or cancel in Settings.
Website: https://peaklat.com
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://peaklat.com/privacy/
Heat Alerts (Pro)
Get notified before heat becomes dangerous. Choose a KSI flag level (Black Flag by default, or Yellow, Orange, or Red), or set your own WBGT temperature. WBGT Heat checks the forecast and alerts you once per day when conditions are expected to reach your threshold. Turn it on in Settings under Notifications.
Home Screen Widget (Pro)
See the current WBGT and heat flag at a glance without opening the app. Choose the small widget for the current reading, or the medium widget for the next few hours. The widget follows your selected mode and temperature units and updates throughout the day.
The developer, Peak Latitude LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Peak Latitude LLC
- Size
- 16.2 MB
- Category
- Weather
- Compatibility
Requires iOS 18 or later.
- iPhone
Requires iOS 18 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Annual $14.99
- Pro Monthly $2.99
- Pro Lifetime $34.99
- Copyright
- © 2026 Peak Latitude LLC