WetBulbCast

WetBulbCast

Forecasts with wet bulb temp.

1 ratings
1 review
Free

Details

  • Released
  • Updated

Features

WetBulbCast screenshot #1 for iPhone
WetBulbCast screenshot #2 for iPhone
WetBulbCast screenshot #3 for iPhone
WetBulbCast screenshot #4 for iPhone
WetBulbCast screenshot #5 for iPhone
WetBulbCast screenshot #6 for iPhone
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About

This app provides hourly wet-bulb temperature forecasts for up to 10 days, helping you determine the effectiveness of evaporative coolers. It also includes dew point, feels-like temperature, UV index, wind speed, and precipitation probability for a comprehensive weather overview.

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
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What's New in WetBulbCast

1.2

September 8, 2026

10 days of history — and a new way to move around WetBulbCast now keeps the past 10 days of weather alongside the forecast, so you can look back at what the weather actually did, not just what was predicted. Making room for that changed how you move around the app: • Swipe a graph left or right to scroll through time, from 10 days back to the end of the forecast. • Swipe up or down to switch between the 24-hour and 10-day graphs. • Every screen now has a button on each side of its title for the two screens you are not on — the quickest way to the table and back. Switching between a graph and the table keeps your place in time. • Because a downward swipe now changes screens, pull-to-refresh has been replaced by a refresh button beside the place name. Also new • Rings mark the current time on every graph, so "now" is easy to find however far you have scrolled. A tap on a graph puts the long-press scrubber away. • The table covers the same ten days back and ten days ahead, and opens at the current hour. • "Zoom graph" (previously "Fold timeline") puts the 24-hour and 10-day graphs on a single screen — pinch to zoom anywhere between one day and ten. • Day labels on the graphs now show the date as well as the weekday. • A new "i" button opens the info screen, which also shows which version you are running.

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User reviews

Accurate, and excellent

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.
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Response from developer

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.

Developer apps

FAQ

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.