Weather is fickle. Knowing what it is or going to be before you go outside both saves and ruins the day.
Weather forecasts save your day when it storms because you’ll have packed an umbrella or extra rain jacket. However, weather predictions disappoint you when the day turns out dry; you just lugged around extra protection all day for nothing.
Expectation initiates preparation. The whole point of knowing the future is to prevent it. But even if you prepare nothing you’ll still survive. There’s always a way to circumvent bad weather; you can take transportation or merely stay inside, walk between buildings. You’re just as fortunate not knowing what’s to come and living as is.
You can deal with forecasts now and prepare, wait and see what happens, or ignore the forecast completely and just adapt. It all works out in the end.