Built for Duo

Mercury Weather

Chart-based weather app with a side-by-side layout on the unfolded Duo

Triple Glazed Studios LLC · Weather · Free · in-app purchases

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iPhone screenshots

iPad screenshots

How it uses iPhone Duo

The developers' notes for version 3.8.1 say Mercury is ready for iPhone Duo: unfolded, it shows your locations next to the forecast, and folded, it returns to the familiar iPhone layout. The same notes say you can open two Mercury windows side by side to compare the weather in two places. We have not yet tested it on an iPhone Duo.

What’s New

Version 3.8.1 · October 9, 2026

This update unfolds Mercury on iPhone Duo. Plus, a 24-hour look back in the hourly forecast. iPhone Duo Mercury is ready for iPhone Duo. Unfold it to see your locations next to the forecast, and fold it for the familiar iPhone layout. You can also open two Mercury windows side by side to compare the weather in two places. HOURLY HISTORY Wondering how warm it got this afternoon or when the rain actually stopped? Pull the hourly forecast back past the current hour and release to see the past 24 hours. Tap Now to jump back to the forecast. FIXES Temperature lines in compact widgets and Apple Watch complications now line up correctly in right-to-left languages. Kai & Malin

About this app

Mercury Weather, from the two-person team at Triple Glazed Studios, is a weather app built around clear charts rather than dense tables of numbers. It covers the everyday basics, including hourly and daily forecasts, a radar map, rain forecasts and weather notifications, and adds features that are less common in mainstream apps: a Trip Forecast for planning travel, hurricane and storm tracking, tide forecasts and climate normals that show how today compares with typical conditions. Home Screen and Lock Screen widgets and an Apple Watch app keep the forecast visible without opening the app. Version 3.8.1 is the release the developers describe as unfolding Mercury on iPhone Duo. On the unfolded display the app places your saved locations next to the forecast, while folding the phone returns it to the standard iPhone layout. The update also lets you open two Mercury windows side by side to compare two places, and adds an hourly history view that shows the previous 24 hours when you pull the hourly forecast back past the current time. Mercury is free to download, with monthly, yearly and lifetime subscriptions available as in-app purchases, including family options. It suits people who want a quick visual read of the forecast and who track the weather in more than one place.

App Store descriptionWritten by the developer.

"It's a weather app. How much is there to say?" – Malin from Triple Glazed Studios' crack product marketing team TOP FEATURES – Beautiful weather charts – Detailed daily forecast – Trip Forecast – Incredibly accurate rain forecast – Hurricane and storm tracking – Tide forecasts – Weather notifications – Radar map – Simple yet powerful Apple Watch app – Easy to glance home screen and lock screen widgets – Weather normals Privacy policy: https://tripleglazedstudios.com/mercury/privacy Terms of use: https://tripleglazedstudios.com/mercury/terms