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Best Heat Index Apps

249+ iOS apps curated and reviewed

4.0 avg rating
18 free apps
Updated August 2026

If you already know OSHA, this is the deeper bench. 249+ heat index apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.

Compare top Heat Index Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1OSHA-NIOSH Heat Safety ToolOSHA-NIOSH Heat Safety ToolFree2.5β˜… (312)NoNoAug 2026
2Heat SafetyHeat SafetyFree4.6β˜… (2.5K)YesYesAug 2026
3Heat Index: NIOSH CalculatorHeat Index: NIOSH CalculatorFree4.4β˜… (19)NoNoAug 2026
4HeatAlert: Heat Stress IndexHeatAlert: Heat Stress IndexFree3.6β˜… (11)NoNoAug 2026
5Heat Index: Worksite SafetyHeat Index: Worksite SafetyFree5.0β˜… (1)NoNoJul 2026
6Heat Index Calculator ProHeat Index Calculator ProFree4.7β˜… (69)YesYesAug 2026
7Heat Index: Get Heat AlertsHeat Index: Get Heat AlertsFreeβ€”NoYesAug 2026
8Swelter: Heat IndexSwelter: Heat IndexFreeβ€”NoYesAug 2026

Top Picks for Heat Index

OSHA-NIOSH Heat Safety Tool#1

OSHA-NIOSH Heat Safety Tool by Centers For Disease Control and Prevention

Editor's Choice
β˜€οΈ Weather
2.5😞(312 ratings)
Free
#19in Weather
OSHA-NIOSH Heat Safety Tool screenshot 1
OSHA-NIOSH Heat Safety Tool screenshot 2
OSHA-NIOSH Heat Safety Tool screenshot 3
OSHA-NIOSH Heat Safety Tool screenshot 4
OSHA-NIOSH Heat Safety Tool screenshot 5
OSHA-NIOSH Heat Safety Tool screenshot 6

This tool helps outdoor workers stay safe by providing real-time heat index information and hourly forecasts specific to their location. It offers occupational safety recommendations and details on heat-related illnesses and their first aid.

What We Love

  • πŸ’‘ Valuable tool for heat safety
  • πŸ‘ Useful and informative
  • πŸ‘ Precise and accurate
  • πŸ‘ Great for tracking heat index

Room to Improve

  • πŸ› Crashes or doesn't load data
  • πŸ› Inaccurate or inconsistent temperature/heat index readings
  • πŸ› Doesn't work in Canada
Heat Safety#2

Heat Safety by Qvyshift LLC

Heat Conditions and Forecasts
Strong Contender
β˜€οΈ Weather
4.6😞(2.5K ratings)
FreeAdsIn-App Purchases
#18in Weather
Heat Safety screenshot 1
Heat Safety screenshot 2
Heat Safety screenshot 3
Heat Safety screenshot 4
Heat Safety screenshot 5
Heat Safety screenshot 6

This tool helps prevent heat-related illnesses for outdoor workers by providing heat index and wet bulb temperature data. It offers current conditions and forecasts for US locations, using standardized risk level categorizations to help plan work activities and ensure safety.

What We Love

  • πŸ‘ Straightforward, simple graphics
  • πŸš€ Works great initially
  • πŸ’‘ Useful for understanding heat index/wet bulb temps

Room to Improve

  • πŸ› Suddenly stops working/retrieving info
  • πŸ› Inconsistent performance, won't give readings sometimes
  • πŸ› Crashes frequently when trying to get heat assessment
Heat Index: NIOSH Calculator#3

Heat Index: NIOSH Calculator by Svitlana Kyrylova

Heat Safety & Risk Level Tool
Worth Considering
β˜€οΈ Weather
4.4(19 ratings)
Free
Heat Index: NIOSH Calculator screenshot 1
Heat Index: NIOSH Calculator screenshot 2
Heat Index: NIOSH Calculator screenshot 3

This tool calculates the heat index based on temperature and humidity, providing OSHA-calibrated risk levels and protective recommendations for outdoor work. It also includes a reference guide for heat-related illnesses and first aid.

More Heat Index apps to explore

4
HeatAlert: Heat Stress Index
HeatAlert: Heat Stress Index
HeatAlert: Heat Stress Index
WBGT Conditions & Monitoring
Free

This application provides real-time Wet Bulb Globe Temperature (WBGT) and detailed weather forecasts for your location. It offers heat stress risk assessments and actionable recommendations to help you stay safe outdoors. Receive location-based insights including temperature, humidity, wind speed, and UV index.

Real-time WBGT valuesLocation-based weather forecastsHeat stress risk assessment
β˜€οΈ Weather
(11)
free
5
Heat Index: Worksite Safety
Heat Index: Worksite Safety
Heat Index: Worksite Safety
Live sensor heat-break alerts
Free

This app provides real-time heat index readings from a connected worksite sensor. It helps supervisors and managers determine if extra breaks are needed based on current temperature and humidity conditions, ensuring worksite safety.

Live heat index readingsHome Screen widget12-month history chart
πŸ”§ Utilities
(1)
free
6
Heat Index Calculator Pro
Heat Index Calculator Pro
Heat Index Calculator Pro
Heat Index & Weather
Free

Instantly determine how hot it truly feels by combining temperature and humidity. This app provides real-time weather data, forecasts, and heat risk warnings to help you plan outdoor activities safely and avoid heat-related illnesses.

Accurate Heat Index CalculatorReal Time Weather Data3 Hour Heat Forecast
β˜€οΈ Weather
(69)
free
7
Heat Index: Get Heat Alerts
Heat Index: Get Heat Alerts
Heat Index: Get Heat Alerts
Feels Like Temp, WBGT & Risk
Free
β˜€οΈ Weather
(0)
8
Swelter: Heat Index
Swelter: Heat Index
Swelter: Heat Index
Heat Stress, WBGT & Safety
Free
β˜€οΈ Weather
(0)
9
Heat Index: Wet Bulb
Heat Index: Wet Bulb
Heat Index: Wet Bulb
WBGT & Heat Risk Forecast
$2.99
$3.99 | 25% OFF

This app provides real-time heat conditions and forecasts to help users avoid heat-related illness. It offers hourly and 7-day outlooks with clear risk level guidance, designed exclusively for users in the United States.

Current Heat Index and risk levelWet Bulb / WBGT categoriesHome Screen widget
β˜€οΈ Weather
(1)
paid
10
Heat Index Calculator - Calc
Heat Index Calculator - Calc
Heat Index Calculator - Calc
Felt Air, Apparent Temperature
Free

Calculate the heat index by simply inputting air temperature and relative humidity. Supports multiple temperature units including Kelvin, Celsius, and Fahrenheit. Results are for reference only.

Heat Index CalculationAir Temperature InputRelative Humidity Input
πŸ”§ Utilities
(1)
free with in-app purchases
11
Heats: Heat Index & UV
Heats: Heat Index & UV
Heats: Heat Index & UV
Feels Like, UV & Sun Safety
Free

This app provides real-time heat index and UV index readings, along with accurate forecasts. It helps users plan outdoor activities and stay safe from dangerous weather conditions.

Real-time heat indexLive UV indexLocation-based weather data
β˜€οΈ Weather
(10)
free with in-app purchases
12
HeatGuard: Heat Index
HeatGuard: Heat Index
HeatGuard: Heat Index
WBGT, UV & Heat Alerts
Free
β˜€οΈ Weather
(0)
13
Heat Index - HI
Heat Index - HI
Heat Index - HI
Feeling hot or cold
$2.99

This tool calculates the "felt air temperature" by combining air temperature and relative humidity using a specific scientific equation. It provides current weather conditions and allows users to search for and save favorite locations worldwide.

Heat Index calculation (Rothfusz equation)Current temperature and humidityChoice of Celsius, Fahrenheit, and Kelvin
β˜€οΈ Weather
(8)
paid
14
Heat Index and Wind Chill
Heat Index and Wind Chill
Heat Index and Wind Chill
Discover the local real feel
Free

This weather application provides real-time conditions and five-day forecasts. It calculates the perceived temperature based on humidity and wind speed, offering insights into how hot or cold it truly feels.

Real-time weather informationFive-day forecastsHeat Index calculation
β˜€οΈ Weather
(7)
ad-supported
15
Heat Index
Heat Index
Heat Index
by Thai Meteorological Department
Free

This app displays the heat index for various locations, considering both temperature and humidity. It provides information on potential health impacts, recommendations, and forecasts at the sub-district level to help users stay safe during hot weather.

Heat index calculationLocation-based dataHealth impact information
β˜€οΈ Weather
(1)
free
16
Wind Chill & Heat Index
Wind Chill & Heat Index
Wind Chill & Heat Index
Feels Like Temp & Humidex
Free
β˜€οΈ Weather
(0)
17
Heat Index: Outdoor Weather
Heat Index: Outdoor Weather
Heat Index: Outdoor Weather
UV Index, AQI & AI Advice
Free
β˜€οΈ Weather
(0)
18
WeatherBug: Weather Forecast
WeatherBug: Weather Forecast
WeatherBug: Weather Forecast
Live Local Radar, Storm Alerts
Free

Get accurate, real-time weather forecasts and severe storm alerts powered by a global professional weather network. Visualize conditions with interactive maps, track lightning, and stay informed about pollen, air quality, and more.

Real-Time Pinpoint ForecastsEnhanced Interactive MapSevere Weather Alerts
β˜€οΈ Weather
(2.2M)
free with in-app purchases
19
Heat Index & Category Computer
Heat Index & Category Computer
Heat Index & Category Computer
Weather, stations, and safety
Free
$0.99 | 100% OFF

This app calculates the perceived temperature by considering both air temperature and relative humidity. It provides a heat category to help users determine necessary precautions when outdoors, especially in high temperatures and humidity.

Perceived temperature calculationHeat category for safetyConsiders air temperature and humidity
β˜€οΈ Weather
(1)
paid
20
HeatSafe WBGT
HeatSafe WBGT
HeatSafe WBGT
Live heat-risk & WBGT safety
Free
β˜€οΈ Weather
(0)

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FAQ about Heat Index

What are the best heat index apps for iPhone?
OSHA-NIOSH Heat Safety Tool tops our heat index apps ranking as of August 2026, with a 2.5-star average from 312 App Store ratings, and it's free to download.
Yes β€” 18 of the top heat index apps we rank are free to download, including OSHA-NIOSH Heat Safety Tool and Heat Safety.
OSHA-NIOSH Heat Safety Tool has no ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 249+ heat index apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides real-time heat index information and hourly forecasts tailored to your location to help outdoor workers take precautions against heat. It also offers occupational safety and health recommendations from OSHA and NIOSH.
Key features include a visual indicator of the current heat index and risk levels, hourly forecasts with recommendations, customizable controls for temperature and humidity, and information on signs, symptoms, and first aid for heat-related illnesses.

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