# HeatAlert: Heat Stress Index — WBGT Conditions & Monitoring

> Real-time WBGT and weather data for heat safety and outdoor planning. (iPhone/iPad app by WeatherFlow.)

- Source: https://appshunter.io/ios/app/heatalert-heat-stress-index/id6475117114 (this page in markdown: same URL + `.md`)
- Developer: [WeatherFlow](https://appshunter.io/developer/317992028)
- Category: Weather, Health & Fitness
- Price: Free
- Rating: 3.60/5 from 11 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 35 MB
- Languages: American English
- Released: 2025-01-10
- Data updated: 2026-09-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/heatalert-heat-stress-index/id6475117114/reviews.md

## What is HeatAlert?

Stay Cool & Safe:
Whether you're an outdoor enthusiast, an athlete, or simply concerned about staying safe in the scorching heat, this app is your go-to companion for real-time Wet Bulb Globe Temperature (WBGT) and associated weather information.


Key Features:

Location-Based Weather Insights:
Access detailed weather forecasts tailored to your specific location. Get current temperature, humidity levels, wind speed, and UV index to plan your activities and outdoor adventures wisely.

Precise WBGT Values:
Harnessing the power of 65,000+ Tempest Weather Systems, HeatAlert uses real-time temperature, humidity, wind speed, and solar radiation data recorded by nearby Tempest stations to provide Wet Bulb Globe Temperature information to users.   This ensures the WBGT values in the HeatAlert app are tailored to your specific location, giving you a better understanding of the environmental conditions affecting you directly.

Heat Stress Risk Assessment:
Our app goes beyond providing raw data – using the National Weather Service WBGT suggested actions, we provide actionable recommendations to help you stay safe and cool.

Regular Updates:
We're committed to enhancing your experience and staying ahead of the curve. Expect regular updates with new features and improvements based on user feedback and the latest advancements in heat stress monitoring.

Download HeatAlert by Tempest and take control of your safety in the heat! Stay cool, stay informed, and enjoy the outdoors responsibly.

## Key features

- Real-time WBGT values
- Location-based weather forecasts
- Heat stress risk assessment
- Actionable safety recommendations
- UV index and humidity data
- Powered by Tempest Weather Systems

## Chart rankings

- #196 in Top Free · Weather (US App Store)

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/heatalert-heat-stress-index/id6475117114/reviews.md

### 1/5 — Bad app

*2026-07-13*

Inaccurate weather. Niosha is more accurate with wind and humidity. Says it’s 82 when it’s 111 outside

### 5/5 — Finally true wet bulb global temps!

*2026-06-25*

Been after an app that would calculate these for ages. With the heat wave in Europe I need to know if it’s safe to train. This app serves that purpose

Thank you devs!

### 1/5 — Doesn’t work

*2024-04-16*

I can not make this app work at all on my iPhone 13. 
I have tried everything i can think of to do.

**Developer response:** Hey! Please contact our support team for assistance and troubleshooting. You can email us at support@tempest.earth or open a ticket from help.tempest.earth

## Frequently asked questions about HeatAlert

### What is HeatAlert's WBGT accuracy based on?

HeatAlert uses real-time temperature, humidity, wind speed, and solar radiation data from over 65,000 Tempest Weather Systems. This ensures the WBGT values are tailored to your specific location for better environmental condition understanding.

### Does HeatAlert offer recommendations for heat safety?

Yes, HeatAlert provides actionable recommendations based on the National Weather Service WBGT suggested actions. These guidelines help users stay safe and cool in hot weather conditions.

### How often is HeatAlert updated?

The app is committed to regular updates with new features and improvements. The latest version is 1.5.5, and it was last updated on December 2, 2025, indicating a focus on ongoing development.

### What devices is HeatAlert available on?

HeatAlert is available for iPhone, iPad, and iPod devices. It is designed to provide its heat stress monitoring features across Apple's mobile ecosystem.

### What is the age rating for HeatAlert?

HeatAlert has an age rating of 4+, making it suitable for a wide range of users. This indicates no mature content is present in the application.

### Does HeatAlert have ads?

No, HeatAlert does not contain advertisements. Users can enjoy a seamless experience without interruptions from in-app ads.

### What kind of weather information does HeatAlert provide?

HeatAlert provides detailed weather forecasts tailored to your specific location. This includes current temperature, humidity levels, wind speed, UV index, and precise WBGT values.

### When was HeatAlert first released?

HeatAlert was first released on January 17, 2024. This makes it a relatively new application focused on providing up-to-date heat stress monitoring.

## Version history (last 5 releases)

### 1.5.7 — 2026-07-27

Bug Fixes and Performance Enhancements

### 1.5.6 — 2026-04-23

Bug Fixes and Performance Enhancements

### 1.5.5 — 2025-12-02

- Added a NWS alert map layer
- Bug Fixes and Performance Enhancements

### 1.5.4 — 2025-06-10

- Bug Fixes and Performance Enhancements

### 1.5.3 — 2025-06-03

- Bug Fixes and Performance Enhancements

## Apps similar to HeatAlert

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Heat Index and Wind Chill](https://appshunter.io/ios/app/heat-index-and-wind-chill/id1550107650) | 2.6 (7) | Free | Weather |
| [Heat Safety](https://appshunter.io/ios/app/heat-safety/id6472613736) | 4.6 (2,546) | Free | Weather |
| [Teapot for Tempest](https://appshunter.io/ios/app/teapot-for-tempest/id6463181166) | 3.9 (46) | Free | Weather |
| [Meteo Calc: Weather Forecast](https://appshunter.io/ios/app/meteo-calc-weather-forecast/id1374113357) | 4.6 (201) | Free | Weather |
| [Heat Index Calculator Pro](https://appshunter.io/ios/app/heat-index-calculator-pro/id6476157163) | 4.7 (69) | Free | Weather |
| [Zelus WBGT](https://appshunter.io/ios/app/zelus-wbgt/id1605250081) | 3.1 (42) | Free | Weather |

## More apps by WeatherFlow

- [WindAlert: Wind & Weather Map](https://appshunter.io/ios/app/windalert-wind-and-weather-map/id317992025)
- [SailFlow: Sailing Forecasts](https://appshunter.io/ios/app/sailflow-sailing-forecasts/id555309964)
- [iKitesurf: Weather & Waves](https://appshunter.io/ios/app/ikitesurf-weather-and-waves/id555643284)
- [FishWeather: Marine Forecasts](https://appshunter.io/ios/app/fishweather-marine-forecasts/id555644333)
- [iWindsurf: Weather and Waves](https://appshunter.io/ios/app/iwindsurf-weather-and-waves/id564865754)
- [Wind & Weather Meter](https://appshunter.io/ios/app/wind-and-weather-meter/id653579366)

All apps by WeatherFlow: https://appshunter.io/developer/317992028

## Related topics

[heatstroke wbgt](https://appshunter.io/ios/topics/heatstroke-wbgt) · [heat safety](https://appshunter.io/ios/topics/heat-safety) · [heat index](https://appshunter.io/ios/topics/heat-index) · [heat safety tool](https://appshunter.io/ios/topics/heat-safety-tool) · [heat index tool](https://appshunter.io/ios/topics/heat-index-tool) · [osha heat index](https://appshunter.io/ios/topics/osha-heat-index) · [niosh heat index](https://appshunter.io/ios/topics/niosh-heat-index) · [aiha heat stress app](https://appshunter.io/ios/topics/aiha-heat-stress-app) · [heatwave](https://appshunter.io/ios/topics/heatwave) · [wet bulb temperature](https://appshunter.io/ios/topics/wet-bulb-temperature) · [heat index and wind chill](https://appshunter.io/ios/topics/heat-index-and-wind-chill) · [heat safety app](https://appshunter.io/ios/topics/heat-safety-app) · [niosh heat stress](https://appshunter.io/ios/topics/niosh-heat-stress) · [wet bulb](https://appshunter.io/ios/topics/wet-bulb) · [osha heat](https://appshunter.io/ios/topics/osha-heat) · [wbgt](https://appshunter.io/ios/topics/wbgt) · [osha heat stress](https://appshunter.io/ios/topics/osha-heat-stress)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*