# WetBulbCast — Forecasts with wet bulb temp. > Hourly wet-bulb temperature forecasts for evaporative cooler effectiveness. (iPhone/iPad app by Rob Boer.) - Source: https://appshunter.io/ios/app/wetbulbcast/id6761316594 (this page in markdown: same URL + `.md`) - Developer: [Rob Boer](https://appshunter.io/developer/1888836766) - Category: Weather, Utilities - Price: Free - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 18.6 · 15 MB - Languages: American English - Released: 2026-05-06 - Data updated: 2026-08-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/wetbulbcast/id6761316594/reviews.md ## What is WetBulbCast? Is it a good day for your swamp cooler? Your evaporative (swamp) cooler cannot cool the air it blows into your house to below the wet bulb temperature — and how well they work depends almost entirely on one number: the wet-bulb temperature. When it's low, your cooler can drop indoor temperatures dramatically and cheaply. When it's high, running it barely helps. What you get
: • Wet-bulb temperature — the single most important number for swamp cooler effectiveness, shown for every hour of the next 10 days 
 • Dew point — a direct measure of how much moisture is already in the air
 • Feels-like temperature — so you know what it's actually like outside, not just what the thermometer says
 • 10-day hourly forecast — plan your cooler schedule days ahead and whether you may need AC instead 
 • UV index, wind speed, precipitation probability, and cloud cover — the full picture in one compact table
• Interactive chart — visualize temperature, wet-bulb, and dew point trends at a glance 
 • Multiple saved locations — check your home, office, or any place you care about Powered by Apple Weather
 WetBulbCast uses Apple's WeatherKit for accurate, hyperlocal forecasts updated throughout the day. ## Key features - Hourly wet-bulb temperature forecast - 10-day forecast - Dew point and feels-like temperature - UV index, wind speed, precipitation - Interactive weather charts - Multiple saved locations ## Chart rankings - #207 in Top Free · Weather (US App Store) ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/wetbulbcast/id6761316594/reviews.md ### 5/5 — Accurate, and excellent *2026-07-01* This app calculates wetbulb correctly, has excellent by the hour forecasts, zero ads, and it’s fast and it’s free! The interface is a little clunky, but that’s more than a fair trade for the display of so much useful information. I had the “Heat Safety” app previously, which absolutely blew the wetbulb calculation. Heat Safety is not recommended. Big thanks to the creator for making this available for free. **Developer response:** Thanks for the review! I am pleased to see that you find the app useful. I am thinking about how to improve the interface. If you have any ideas for that, please let me know. ## Frequently asked questions about WetBulbCast ### What is the wet-bulb temperature and why is it important for WetBulbCast? The wet-bulb temperature is the lowest temperature that can be reached by the evaporation of water. For evaporative coolers, it's the single most important factor determining how effectively they can cool the air. WetBulbCast provides this crucial data hourly for up to 10 days. ### Does WetBulbCast have ads? No, WetBulbCast does not contain advertisements. It is a completely ad-free experience for users. ### How often is WetBulbCast updated? WetBulbCast uses Apple's WeatherKit for forecasts, which are updated throughout the day. The app itself was last updated on July 13, 2026, to version 1.0.1. ### What devices is WetBulbCast available on? WetBulbCast is available for iPhone and iPad devices, supporting a wide range of Apple users. ### Can I check the weather for multiple locations with WetBulbCast? Yes, WetBulbCast allows you to save multiple locations. This means you can easily check the wet-bulb temperature and other weather details for your home, office, or any other place you care about. ### What other weather information does WetBulbCast provide besides wet-bulb temperature? In addition to wet-bulb temperature, WetBulbCast offers dew point, feels-like temperature, UV index, wind speed, precipitation probability, and cloud cover, providing a comprehensive weather picture. ### What is the age rating for WetBulbCast? WetBulbCast has an age rating of 4+, making it suitable for a broad audience of users. ### Is WetBulbCast free to download and use? Yes, WetBulbCast is completely free to download and use, with no in-app purchases or subscriptions required. ## Version history (last 3 releases) ### 1.1 — 2026-07-25 An Apple Watch app and complication; more ways to show the graphs; a 'scrubber' to show more data in the graphs. ### 1.0.1 — 2026-07-13 Bug fix of calculating elevation-barometric pressure. ### 1.0 — 2026-05-06 No release notes. ## More apps by Rob Boer - [SetsRepsWheels](https://appshunter.io/ios/app/setsrepswheels/id6761698205) All apps by Rob Boer: https://appshunter.io/developer/1888836766 ## Related topics [wet bulb temperature](https://appshunter.io/ios/topics/wet-bulb-temperature) · [wet bulb](https://appshunter.io/ios/topics/wet-bulb) · [dew point temperature](https://appshunter.io/ios/topics/dew-point-temperature) · [global warming prediction](https://appshunter.io/ios/topics/global-warming-prediction) · [gradient weather](https://appshunter.io/ios/topics/gradient-weather) --- *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 2026-08-24.*