Depending on where you live, if you're the type of person who spend most of the day away from home, having some understanding of the weather to expect throughout the day is very useful for not experiencing the weather too much.
Very useful to know if it's likely to rain or be windy, and the highs and lows. I might be leaving at noon when it's comfortable and warm outside, but I might be coming home needing a thick jacket and an umbrella. If I'm already outside experiencing the sudden rainstorm and my umbrella is at home, it doesn't really matter that it wasn't raining when I left home many hours ago.
Very useful to know if it's likely to rain or be windy, and the highs and lows. I might be leaving at noon when it's comfortable and warm outside, but I might be coming home needing a thick jacket and an umbrella. If I'm already outside experiencing the sudden rainstorm and my umbrella is at home, it doesn't really matter that it wasn't raining when I left home many hours ago.