Do you... not go outside? And not need to know if you need the heavy coat, light coat, light waterproof coat, and/or umbrella? Or pants vs shorts? And the answers are very different at 7am vs 11am vs 3pm?
I'm not trying to be sarcastic, I'm just genuinely baffled.
That said: I seem to get by pretty well with a lowly smartphone so far.
The temperature inside is not at all indicative of the temperature outside, the sun being out doesn't mean it is warm, and I don't really have any useful indicators of wind, unless the windows are rattling, but that doesn't let me know if there's a stiff breeze.
I could walk over and open up my balcony door and experience it all personally, but checking my phone or watch is faster and more accurate, and also gives me the forecast at the same time.