Apple might fix WeatherKit & Wi-Fi issues soon with iOS 16.4.1
Apple might soon release an emergency iOS 16.4.1 update to fix issues with WeatherKit and Wi-Fi passwords.

Apple might release iOS 16.4.1
Some iPhone users have recently noticed problems with the Weather app in iOS. People worldwide have experienced a blank screen in the app saying there is no available data, though Apple's system status page only mentions Alaska.
According to Apple, the issues began at 11:00 pm Eastern on Monday. On Tuesday, a rumor has surfaced about a new software update.
Citing an unknown source with a "proven track record," MacRumors believes that Apple is planning to release iOS 16.4.1 either this week or next. A couple of Twitter users also mentioned problems with Wi-Fi passwords in iOS 16.4.
Separately, some Mac users have reported network connection problems with macOS Ventura 13.3. As a result, users who connected to Apple devices over an SMB connection or from Apple to Windows were suddenly unable to do so.
It's not unusual for Apple to release minor updates like iOS 16.4.1 to address security vulnerabilities or significant problems with the software. People can find and install updates by going to Settings > General > Software Update.
Read on AppleInsider

Apple might release iOS 16.4.1
Some iPhone users have recently noticed problems with the Weather app in iOS. People worldwide have experienced a blank screen in the app saying there is no available data, though Apple's system status page only mentions Alaska.
According to Apple, the issues began at 11:00 pm Eastern on Monday. On Tuesday, a rumor has surfaced about a new software update.
Citing an unknown source with a "proven track record," MacRumors believes that Apple is planning to release iOS 16.4.1 either this week or next. A couple of Twitter users also mentioned problems with Wi-Fi passwords in iOS 16.4.
Separately, some Mac users have reported network connection problems with macOS Ventura 13.3. As a result, users who connected to Apple devices over an SMB connection or from Apple to Windows were suddenly unable to do so.
It's not unusual for Apple to release minor updates like iOS 16.4.1 to address security vulnerabilities or significant problems with the software. People can find and install updates by going to Settings > General > Software Update.
Read on AppleInsider
Comments
Left the weather app open for a while, and after 2 minutes it finally refreshed.
I've also experienced the wifi issues since installing Ventura 13.3 and iOS 16.4.
I often have a problem with Exercise not updating the overall calories. I don't recall the overall being less than the move total, but if I've been wearing my watch for 12 hours, and have 12 hours of "Stand" showing as well as even a few minutes of Exercise, there's no way that the overall calories burned at that point is less then 750! Actually quitting the app and reopening it, I've had the overall calorie count suddenly increase by over 1,000 calories! They also need to add some real world exercises - such as shoveling snow off the driveway or chopping wood!
Using "reset identifier" (under weather tab) seems to clear problem most of the time. Slow to update at times.
Once I get it to populate the window, I keep it minimized. Also see similar problem with weather widget.
Believe "reset identifier" (tracking?) was also the correction for a similar problem in Stocks app back on Big Sur about a year (or more) ago.
As a work-around, have been using AccuWeather or weather.com website (but a bit less convenient).