Heat Index: Get Heat Alerts
Feels Like Temp, WBGT & Risk
About
This app provides real-time heat index and risk levels, helping you understand dangerous heat conditions. It offers hourly and daily outlooks, official alerts, and guidance for outdoor activities and heat illness prevention.
What's New in Heat Index
1.0.0
July 24, 2026
Subscriptions & In-App Purchases
HeatIndex Pro Monthly
Full forecasts, WBGT and custom heat alerts
Developer apps
FAQ
What is the Heat Index app?
Heat Index is a weather app that provides real-time heat index, risk levels, and safety guidance. It uses the official NWS heat index formula and offers features like hourly danger timelines and government alerts.
Does Heat Index have ads?
No, Heat Index is designed to be private by design and does not contain advertisements. Your location data is also not tracked or shared.
How does Heat Index calculate the heat index?
Heat Index computes the official NWS heat index using the published National Weather Service formula, drawing data from Apple Weather. It also offers a 'Full Sun' mode to adjust for direct sunlight.
What are the features of Heat Index Pro?
Heat Index Pro offers a full 48-hour timeline, a 7-day outlook, estimated WBGT, up to 10 saved locations with per-location alerts, and a morning briefing. The core reading is always free.
How much does Heat Index Pro cost?
Heat Index Pro is available as a subscription with monthly ($4.99/P1M) and annual ($29.99/P1Y) plans. The annual plan includes a 3-day free trial.
Can I cancel my Heat Index Pro subscription?
Yes, you can manage or cancel your subscription anytime in your device's Settings. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period.
What devices does Heat Index support?
Heat Index is currently supported on iPhone devices. It works anywhere Apple Weather data is available, including the US, UK, Australia, and Canada.
How often is Heat Index updated?
The app was last updated on July 24, 2026, with version 1.0.0. It is designed to provide real-time data, ensuring you always have the most current heat information.
