It doesn't need to be a stay at home order one little bit. The majority of people know what to do to keep safe and that is lots of sun cream if out, drinking plenty of water, wet flannels over body, cold shower/baths and windows open but shutting the curtains to keep it cool. The weather where I am on Tuesday even looks worse now then on Monday with it getting colder on Tuesday and chance of storms later on in the day. I am going for a meal out on Tuesday evening so pretty sure that won't be cancelled