Now China can forecast the weather in a few days.

I am a meteorologist. The reference time limit of weather forecast generally depends on the weather conditions. Generally speaking, the current three-day forecast can be used for reference.

If the atmospheric situation is relatively stable in autumn and winter, there will be little difference between the forecast and the actual situation in a week or even 10, which can be used for reference. However, in the case of frequent intersection of cold and warm air currents in spring and summer and complicated influencing factors, the forecast of the next day is sometimes not accurate enough.