kWx3.79 - App Store

Minimize bandwidth and eliminate third-party data collection by directly asking official NOAA weather stations, which include many Canadian and Mexican stations. You can add/ rearrange /subtract from the list.

kWx retrieves data directly from weather.gov. Get the current conditions and temperature for most airports and then get the 7-day text forecast for those stations, or offset the forecast location from the weather station, e.g. use KNUQ (Moffett) for current temperature but set the latitude and longitude of Cupertino for the 7-day forecast. This is how NOAA reports the weather for any location. On the list page a station that has an asterisk means the forecast location is different from the weather station or you can rename that station to the actual location. Sometimes data are missing from weather.gov but available from aviationweather.gov (the FAA). These data are used as backup.

On the Add station screen you can click the "Get Location" button and using your favorite mapping app you can enter in the location for where you want the forecast to be from as well as naming the station. Find Station button links to new page that allows you to see all the stations for each State and Canadian Province. If the corrected lat/lon offset is within 0.02 degrees the asterisk is omitted.

Most stations are K+ Airport Locator (e.g. KORD), but Alaska/Hawaii begin with PA/PH, and Canadian stations begin with C. Many Canadian stations are C+Airport Locator (e.g. CYVR for Vancouver) but others begin CW, CX and CZ. In-app lookup for both US and Canadian weather stations.
If available the Heat Index (combination of temperature and humidity) is presented. A heat index below 105F is in yellow, below 125F in orange, above that in red.

~40 Mexican stations are available, all start with MM rather than K (US) or C(Canada). No forecast for the Mexican stations, just current weather.
Most foreign airports have now been added. Enter the ICAO code and aviationweather.gov will return the current temperature, conditions and winds for that airport. ICAO codes are different from IATA codes, which are typically 3 letters. ICAO codes are 4 letters and info about the region the airport is based in. All existing US weather stations (e.g. KORD) are ICAO codes but overseas they tend to be more obscure, eg Heathrow, which has an IATA code of LHR, has an ICAO code of EGLL, Narita is RIAA, CDG is LFPG, Seoul is RKSS, etc. The webs are pretty good at coming up with the right ICAO code for a given airport. Note that there is no forecast within these data, just the current conditions. We are tapping into METAR data for each airport. Try it and see!

The app requires iOS 15

Version History minor bug-squashing update. 3.79 Apr 12 Update METAR database. 3.78 Feb 3 Revamp display so more METAR data available, including altimeter setting (in millibar). Same data available for US and international airports. 3.77 Jan 22 Better integration of non-US airport reporting. Latitude and Longitude listed for ICAO weather stations (for US stations the latitude and longitude are at the bottom of the forecast discussion. 3.72 12/15/2025 City names rather than ICAO names prioritized on list page. ICAO names still seen on forecast page. Latitude and Longitude listed for ICAO weather stations (for US stations the latitude and longitude are at the bottom of the forecast discussion. 3.68 12/13/2025 Now get current weather from most cities in the world! Enter the ICAO code and aviationweather.gov will return the current temperature, conditions and winds for that airport. ICAO codes are different from IATA codes, which are typically 3 letters. ICAO codes are 4 letters and info about the region the airport is based in. All existing US weather stations (e.g. KORD) are ICAO codes but overseas they tend to be more obscure, eg Heathrow, which has an IATA code of LHR, has an ICAO code of EGLL, Narita is RIAA, CDG is LFPG, Seoul is RKSS, etc. The webs are pretty good at coming up with the right ICAO code for a given airport. Note that there is no forecast within these data, just the current conditions. What we are tapping into are the METAR data for each airport. Try it and see! 3.58 11/01/2025 Updated the URL for METAR data which are used to backup the data from weather.gov. 3.38 10/08/2025 New link specification for metar data. 3.36 08/11/2025 Total revamp of the iPad version to take advantage of the greater space. Now the list of current weather stations includes winds and either humidity or wind chill in addition to current temperature and weather. The iPad version also shows the current weather icon for a quick glance assessment. In landscape mode the iPhone version uses space efficiently so you see more of the forecast. Still ad-free. I still collect no data from you, the user. 3.33 03/17/2025 Now you can get the 5-day forecast for Canadian stations directly from weather.gc.ca. Non-airport stations in the US can be queried. Either 3 or 5-digit codes. I don't have a comprehensive list for those, so you need to do some sleuthing to find them. 3.19 02/03/2025 Fixed a bug hashing the METAR data and another bug that caused the program to get data from weather.gov too often. Long press on the app icon allows you to force refreshing of the data. 3.13 01/08/2025 Improved integration of metar data from aviationweather.gov. 3.02 12/13/2024 Fixed display issues associated with opting for bold fonts and enhanced contrast. 2.99 12/02/2024 Elevation displayed for the reporting weather station. In steep terrain can help visualize inversions, etc. 2.97 09/18/2024 Bug snuck into 2.94 version. Oops. 2.95 09/03/2024 Remove call to get METAR data from non-airport stations to reduce data usage. 2.94 09/02/2024 Add missing METAR weather conditions. 2.93 08/11/2024 Bug-fixing update. Missing data shown with .. rather than NA. 2.92 07/10/2024 Re-order the data sources to get the current weather and forecast more efficiently. 2.90 07/02/2024 Use Metar data to get the current conditions and temperature presented on the list page. Full forecast is directly from weather.gov. Metar data very compact so very low data usage if you only look at the list page. 2.82 06/17/2024 Fixed a font issue with the iPad version which made the station name invisible. 2.37 10/09/2022 Minor tweak to be compatible with iOS 16. Transition from reporting Dew Point/Relative Humidity to Wind Chill now set to 35F. 2.36 09/16/2022 Home Screen Quick-Action added to force a refresh of the data collected from the NOAA web site. Weather data are normally updated every 30 minutes to minimize data usage but that can be over-ridden by long-pressing the home screen icon. 2.30 08/25/2022 Fixed a bug that was slowing responsiveness. Startup for iPad more obvious. Heat Index included in temperature if high enough. 2.27 08/05/2022 Heat Index went missing. 2.23 07/17/2022