Perun Weather
Four models, one clear answer
Free · Designed for iPad. Not verified for macOS.
Four weather models and the German radar compared – plus an honest figure for how certain the forecast is. No ads, no account, no tracking.
Perun answers not only what the weather will be, but how reliable that answer is right now.
SEVERAL MODELS INSTEAD OF ONE OPINION
Most apps present a single weather model as the truth. Perun compares four: ICON-D2 and ICON-EU from the German Weather Service, ECMWF and GFS. On top of that comes the DWD radar composite. From this comparison one clear statement emerges – for example: "This evening it will most likely stay dry."
THE RELIABILITY VALUE
Every statement carries a value between 0 and 100 per cent. It reflects how strongly the sources agree, how consistent they are about timing, whether the radar backs the forecast, how fresh the model runs are and how far ahead the forecast reaches. Every part can be opened up in the app. When the sources contradict each other, Perun says so – instead of feigning certainty.
RAIN RADAR WITH THE OFFICIAL NOWCAST
Perun downloads the raw RADOLAN data from the German Weather Service and decodes it itself: the past hour of measurements and the official two-hour forecast, in five-minute steps, as an animation. Forecast frames are clearly marked as such.
OFFICIAL WARNINGS
Weather warnings from DWD, precise for the selected location – with period, description and guidance.
Rain radar and official warnings come from the German Weather Service and are therefore limited to Germany and its immediate surroundings. Outside that area, Perun still shows the full model comparison, clothing advice and all metrics. For places in Canada and the USA, Perun also shows the last two hours of radar measurements.
WHAT TO WEAR
From apparent temperature, precipitation, wind and UV index Perun derives a concrete suggestion: jacket, umbrella, sturdy shoes or sun protection.
METRICS THAT EXPLAIN THEMSELVES
Wind, humidity, pressure, UV index, visibility and cloud cover can be tapped. Each metric explains what it means, places the current value with everyday examples – and warns when it gets critical.
ENERGY (OPTIONAL)
If you want, Perun combines dynamic electricity prices with your tariff, your PV system and your battery. It calculates the real value of a kilowatt-hour – not the market price alone – and recommends when to buy, self-consume, store or feed in. Off by default; no electricity prices are requested unless you enable it.
MORE
• Freely sortable home screen
• Widgets for home and lock screen
• Notification before rain sets in
• Save several locations
• Last loaded data stays visible offline, always with a timestamp
WITHOUT THE CLUTTER
No account, no ads, no tracking, no server of our own. The app queries the public weather services directly; only the coordinates of the selected location are transmitted.
Data sources: Open-Meteo (CC BY 4.0), Deutscher Wetterdienst (radar and warnings, GeoNutzV), Environment and Climate Change Canada and NOAA / National Weather Service (radar for Canada and the USA) and Energy-Charts / Bundesnetzagentur for market prices.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Version 1.5
The rain countdown shows its progress, Perun has radar for Canada and the USA, and everything stays readable at large text sizes.
• Live Activity with a progress bar for ongoing precipitation, the expected amount in the expanded Dynamic Island and an icy blue tint for snow
• The compact Dynamic Island shows the end time instead of a truncated text
• Radar for places in Canada and the USA as well: the last two hours of measurements as an animation
• Cards, hourly list, forecast and radar stay readable at large system text sizes
• Minor text and translation fixes
The developer, Holger Dahn, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Holger Dahn
- Size
- 11.2 MB
- Category
- Weather
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 7 more
- English, Dutch, French, German, Italian, Polish, Portuguese, Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Holger Dähn
