How long will the weather forecast be accurate?

The weather forecast will be more accurate in three days. The meteorological department can collect a lot of meteorological data by using advanced meteorological observation equipment and technology, such as satellites, radars, meteorological sensors, etc., and meteorological models and algorithms are constantly improving, which can analyze and predict the weather changes in three days more accurately, so it is more accurate. Short-term weather forecast is based on existing meteorological data and models, but with the passage of time, the accuracy of forecast will gradually decrease. The three-day weather forecast is relatively accurate, and beyond this time range, the accuracy of the forecast will decline.