There is no WeatherNext 3 app to install on an iPhone, and any page promising one is guessing. The model travels inside Google's own apps and in the browser, so this page lines up the four routes that work on iOS today, shows the add-to-home-screen trick that turns the browser view into something app-shaped, and answers the Android and APK questions in short. For the wider picture, see where the model lives across Google apps and what a download search really finds.
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Three facts worth knowing before you go looking for an install button.
Apple's store does not carry a WeatherNext 3 app from Google, and no listing that claims the name comes from Google.
The Google app, Gemini, Safari and Maps each reach the hourly forecast on an iPhone in a couple of taps.
Adding the browser view to your iOS home screen produces an app-like icon with no store involved at all.
Each of these reaches the model's output without an installer. Pick by the shape of your question.
Search for a city and open the full forecast; on both Android and iOS the hourly panel can draw on the model. No download, no account.
Ask about a place and a date in plain language - the right shape when your question is a trip or an event rather than a city.
weathernext3.lol runs in the browser with the complete hourly experience; nothing to install, nothing to update.
The weather layer sits inside Maps; useful when the forecast question is really a route question.
The closest thing to installing on an iPhone is a home screen shortcut - and it takes the same four taps in any browser.
Go to weathernext3.lol on the iPhone. Safari gives the cleanest integration, though the flow works in any browser.
Open the share sheet from the toolbar at the bottom of the screen.
Scroll the share sheet until you see Add to Home Screen and confirm the name.
The new icon opens straight into the hourly view with no browser chrome - no store, no update prompts, no account required to look.
The same searches happen on Android, so the short answers are here too. The app download guide has the long version.
Google does not publish a standalone WeatherNext 3 app on either store; the model ships inside apps you already have.
A file promising a WeatherNext 3 APK is a wrapper at best and a trap at worst - the forecast itself does not need one.
On Android, the Google app and Gemini work the same way as on iOS, and the browser route is identical.
Stores, mirrors and why they exist are covered in the app download guide and the Google apps page.
The questions that come up most once people start searching on a phone.
Next: the download guide or the hands-on review.
One tap in Safari and the hourly view becomes an icon you can check without opening a browser tab. Seven-day free trial, cancel anytime - and the review covers what a week with it is actually like.