Clara Sky
Weather · Mac & iPhone
A weather app with an actual meteorologist in it. Clara reads what the forecasters at your local National Weather Service office wrote this morning, and tells you what it means for your afternoon.
Every other weather app shows you a number a computer model spat out. Nobody looked at it. Nobody knows that fog sits in your valley until ten, or that storms usually fall apart before they cross the ridge.
Several times a day, meteorologists at your regional National Weather Service office publish a Forecast Discussion — their own reasoning, in their own words. Which model they trust today and which one they think is wrong. How confident they are. What could go wrong. It's the closest thing there is to a forecaster's notebook, and almost nobody outside the field ever reads it, because it's written by meteorologists for meteorologists.
Clara reads it. She folds in severe-storm outlooks, any active alerts, and — if you switch it on — recent weather coverage from your area, then translates the whole lot into plain language.
So instead of “60%,” you get to hear why it's 60%, when it changes, and whether you'll want that jacket.
Clara is a weather nerd and it shows. Tap the mortarboard and she'll explain what a “40% chance of rain” actually means — it isn't what most people think — why “scattered showers” is an honest answer rather than a hedge, why a July pop-up storm is the hardest call she makes, and when your radar screen is quietly lying to you.
There's an interactive demo in there showing how two completely different afternoons produce the very same number on your phone. Nothing is dumbed down; she assumes you can handle it.
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The Briefing
A short, conversational forecast in Clara's voice — what's coming, when it turns, what actually matters.
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Ask Clara
Should I water the garden tonight? Will the rain hold off for the game? Ask in plain words.
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Local expertise
Optional: Clara also looks up recent weather coverage from your area and folds it into her read.
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Severe weather
National Weather Service alerts front and center, with notifications the moment one is issued.
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The numbers
Dew point comfort, feels-like, wind, humidity and UV. Hourly strip. TV-style 7-day outlook.
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Yours, adjustable
Any location worldwide, saved favorites, °F/°C, mph/km/h, text size, dark and light.
Two honest caveats
Clara runs on your own Anthropic API key. It's free to create, and usage is billed by Anthropic to your account — typically pennies a day. Without a key the forecast still works in full; you just won't hear Clara's voice. There's no subscription here and nothing to buy from me.
The local-forecaster layer is US-only. Forecast discussions and alerts come from the US National Weather Service, so that's where it exists. Everywhere else, Clara briefs you from worldwide forecast data in the same voice.
Forecast data by Open-Meteo (CC BY 4.0). US alerts and forecast discussions from the National Weather Service. Severe outlooks from the NOAA Storm Prediction Center. Next-hour precipitation from Weather.