Hi I have a question for people who have got married in August or been to an...

Hi I have a question for people who have got married in August or been to an August wedding in the UK. I'm concerned about the heat. I'd love a princess dress but don't want to cook in it. Has anyone had a big skirt at this time of year? Also, We're thinking of having an outdoor ceremony at about 2pm - venue timings not mine (indoor alternative available). I've no idea how long it will be. Do you think the guests will cope? Thank you! X