天气预报上下雨为啥是晴天

It's possible. Generally speaking, the accuracy of weather forecasts is quite high. It's just because people don't know when they're correct and always remember when they're wrong. 8 out of 10 times they're right, and 2 times out of 10. Wrong, it will also make people think that the weather forecast is inaccurate.
To be honest, I have used basically all the weather software on the market. In fact, they all lead to the same goal by different approaches. They all use data from the National Meteorological Administration. It depends on which one has more compre hensive information and more timely updates. What I use now is to go directly to the AppStore and search for "weather forecast", and one of the top five is from Minesage. There are fewer ads than ink. Set the city and it will be updated on time every day. If there is an early warning in the city or the weather changes, you will be notified immediately.
The interface is simple and laid-back, and looks more comfortable.
I hope you will adopt it. I typed it all by myself, and it is not easy to reply at work.

Weather pre diction is only a high probability event, not an inevitable event. There are many factors that affect the weather, such as humidity, air flow, dust, etc. Moreover, weather data must be accurate to 6 decimal places. The butterfly effect is because weather scientists once ignored the last digit and then calculated the result completely different from the original, so the butterfly flaps its wings and causes a storm.