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WetBulbCast

Rob Boer Weather iPhoneiPadiPod touchApple Watch

WetBulbCast is a free Weather app for iPhone and iPad by Rob Boer. Rated 5.0/5 from 1 ratings. Requires iOS 18.6. Updated September 8, 2026.

Rating
5.0
1 ratings
Price
Free
on the App Store
Size
15 MB
Age 4+
Updated
Sep 8
2026 · v1.2
Download on theApp Store See alternatives

Screenshots

  • WetBulbCast screenshot 1
  • WetBulbCast screenshot 2
  • WetBulbCast screenshot 3
  • WetBulbCast screenshot 4

About 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.

What’s new

Version 1.2 · Updated 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.

App privacy

The developer, Rob Boer, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to WetBulbCast

Looking for apps like WetBulbCast? Here are 6 similar apps on the App Store. The highest rated is Wet Bulb Temperature: WBGT (5.0/5), and all 6 are free to download.

WetBulbCast vs. alternatives
App Rating Price Last updated Compare
WetBulbCast 5.0 / 5 (1 rating) Free September 8, 2026
Wet Bulb & Safety: HeatCue 4.8 / 5 (16) Free Aug 27, 2026 Compare
HeatSafe WBGT 3.0 / 5 (2) Free Sep 21, 2026 Compare
Wet Bulb Temperature: WBGT 5.0 / 5 (15) Free Oct 5, 2026 Compare
Wet Bulb Temperature: Swelter 4.9 / 5 (26) Free Oct 8, 2026 Compare
HeatAlert: Heat Stress Index 3.5 / 5 (13) Free Jul 27, 2026 Compare
Heat Safety 4.6 / 5 (2,796) Free Oct 4, 2026 Compare

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