Well, yeah, but it's nice to have some kind of expectation so you can attempt to plan outdoor activities.IMHO, the only useful weather forecast is looking out the window.
It is irrelevant what the weather is *supposed* to be (forecasts are often wrong). All that matters is what it IS.
That's easy to do. Want to have a picnic? Look outside. If rain, no picnic. If no rain, have picnic.
The weather-guessers here have decades of experience as well as decades of data used to build algorithms that analyze probable weather patterns and conditions. The data from every storm that has passed is processed, analyzed, and used with all past data in order to aid in future forecasting.