I’ve been using the default Apple Weather app since getting my iPhone earlier this year. It’s been fine but over the last few days it seems to be less accurate in general.
I’m in Ireland if that matters.
Edit: Updated the title to include iOS specifically
Give Weawow a go. There’s a website (https://weawow.com/) or a free (and ad-free) app. It’s gorgeous and pretty accurate (I’m in the UK).