Odd one. Without (knowingly) changing anything (of course SOMETHING must have changed) when I booted up Apple Calendar the other day I got this alert from Little Snitch:

CalendarAgent via com.apple.WeatherKitService.xpc wants to connect to api.wunderground.com on TCP port 443 (https)

Any idea why or how that would happen? I don't sync to any Calendars that I know of, and use the Calendar infrequently.

OS X El Capitan 10.11.6


Weather Underground is the provider for Apple's weather data in OS X/macOS (and iOS). Calendar.app downloads weather information for calendar events with a set location.

As soon as you add a location to a calendar event Calendar.app will try to fetch the weather conditions if it's only a few days in the future.

Weather display in Calendar.app

Location services (System Preferences > Security > Privacy) does not effect the download of weather information.

  • Little Snitch has got a lot more twitchy since v4. – Tetsujin Sep 28 '17 at 10:55
  • @Tetsujin Good point. cheakypawl, can you please include the version of Little Snitch that you are using (v4 or v3)? – oa- Sep 28 '17 at 10:58
  • 1
    Create an event for tomorrow and enter a valid location (Toronto, Canada, for example). You will see the weather for the specific time of day. – oa- Sep 28 '17 at 19:33
  • 1
    It's worth pointing out that Location Services being on or off makes no difference to this behaviour. – cheakypawl Sep 28 '17 at 19:52
  • 1
    Had no idea about the CHAT option. Next time! User oa had all the info I needed. – cheakypawl May 21 '18 at 13:25

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .