-40 Weather
Celsius, Fahrenheit & radar
Free · Designed for iPad. Not verified for macOS.
-40 is the one temperature where Celsius and Fahrenheit are exactly equal. It is also a weather app that shows you both scales at once, so you never have to convert, with radar built the way the professionals build it.
BOTH SCALES, ALWAYS
Every temperature appears in °C and °F side by side. Choose which one leads in Settings.
RADAR THAT RUNS ON YOUR PHONE
Most weather apps show you radar. -40 Weather runs it. Instead of downloading finished pictures of the weather, the app downloads compact radar data built from NOAA measurements and draws the map on your device. Pan and zoom instantly, watch a smooth animated loop, and see where storms are heading next. Storm tracks, warning areas and storm reports are layered on top, and you can zoom in for high-resolution detail. Covers the United States and Canada.
YOUR CITIES, ONE SWIPE APART
Save as many places as you like and swipe between them. Add your current location or search for any city in the world.
FORECASTS AT A GLANCE
Current conditions, feels-like, highs and lows, a 7-day forecast, hourly detail, wind, precipitation, and sun and moon times. First light and last light show the usable daylight before sunrise and after sunset. Morning, midday and evening cards suggest what the weather feels like, from sweater weather to beach weather.
ONE TAP TO THE DETAILS
Tiles on the home page show live values and open hourly, precipitation, wind, moon, air quality and pollen, and the Field Guide.
WEATHER ALERTS
See active alerts from the National Weather Service right on the main screen, with optional notifications.
AIR QUALITY AND POLLEN
Check air quality and a 5-day pollen forecast covering tree, grass and weed pollen.
ON THE WATER
Marine conditions, tides, and estimated fishing windows for coastal and inland waters near you. These are estimates and are not for navigation.
BUILT TO SIP YOUR BATTERY
Location uses a coarse fix instead of constant GPS tracking, and weather alerts arrive by push instead of the app checking in on a timer.
DYNAMIC ISLAND AND LIVE ACTIVITIES
Optionally keep the current temperature on your Lock Screen and in the Dynamic Island.
MADE YOUR WAY
Pick a color theme, including one that shifts with the temperature, and choose metric or imperial units. The bottom bar uses Liquid Glass on iOS 26. Works on iPhone and iPad.
Weather data comes from OpenWeather, the National Weather Service and NOAA, Open-Meteo, Google and other sources listed in Settings. Forecasts and alerts are for general information and are not a substitute for official warnings.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's New in 1.4
Hurricanes and tropical storms
• See active hurricanes and tropical storms right on the radar, with the forecast cone, track and watches and warnings.
• Tap the storm button for a list of active storms, and jump to any of them.
• Tap a watch or warning line to see what it means.
Radar
• Tap any warning outline to read the full National Weather Service alert.
• New locate button: centers the map on you and zooms in to the most detailed view.
• Sharper close-up radar: it switches to the nearest radar's high-detail picture sooner, and that picture opens much faster.
• The map appears instantly when you open the radar, and the rain fades in as it loads.
• A new, cleaner base map made for weather.
• Warning outlines and storm graphics now move smoothly with the map when you pan or zoom.
• Canada now animates in step with the US when you zoom out.
• Smoother hand-off between close-up and regional radar, with no gray haze at the edge.
Faster and more reliable
• Your weather shows up faster when you open the app.
• Fewer background network requests at launch.
• Many smaller fixes and performance improvements.
The developer, Jacob Egly, 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 Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jacob Egly
- Size
- 11.7 MB
- Category
- Weather
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 WiredLogix LLC
