Heat Index & Wet Bulb Monitor

WBGT, Humidity & UV Safety

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Know the heat risk where you are—at a glance. Heat Index & Wet Bulb Monitor calculates the National Weather Service heat index and brings the numbers that matter together in one clear view. KEY METRICS • Heat index with published risk levels • Wet-bulb temperature • Estimated WBGT • Air temperature and humidity • Dew point and UV index HEAT-SAFETY GUIDANCE See the current risk band, understand what it means, and view practical work/rest guidance based on your selected workload. HOME SCREEN WIDGETS Check the current heat index and related metrics without opening the app. Small, medium, and Lock Screen widgets keep heat risk visible throughout the day. LIGHT AND DARK APPEARANCE Use the appearance that works best for you, with clear gauges and readable risk levels in either mode. PUBLISHED METHODS The app explains how heat index, wet-bulb temperature, and estimated WBGT are calculated. Estimated WBGT uses weather data and a documented solar estimate; it is not a substitute for an on-site WBGT instrument. PRIVACY FIRST No account, no ads, and no tracking. Heat conditions can change quickly. Follow official local warnings and workplace safety requirements when planning outdoor activity.

Ratings & Reviews

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Fixed: the widget could show an old reading. It only ever updated while you had the app open, so if you hadn't opened Heat Index in a while the widget kept showing whatever it last saw — sometimes days old, with nothing to tell you it was stale. It now refreshes on its own in the background.

Version 1.0.1

The developer, Pixelated Development, 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 Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    • Martin Havlicek
    Size
    • 3 MB
    Category
    • Weather
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English and Japanese
    Age Rating
    9+
    Copyright
    • © 2026 Martin Havlíček
  • Developer Website
  • Privacy Policy

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