I've dithered between putting it in this section and the weather section.....
Quick disclaimer: Remember I'm an amateur forecaster and so I do get things wrong. Please don't make critical decisions based on any forecasts in this thread!
I'll only work up to 10 days in advance (which is five more days than I do normally any more than that and it really is getting into utter guess work. Anything after 5 days is really just trends and possibilities) Also please bear with me if I dont get round to answering everyones individual questions. As we go through the days the forecasts will change.
So:
27th July (Opening Ceremony)
All 3 main models I look at are showing a low pressure developing to the south with a warm (hot in the se?) and humid air mass. This means that heavy showers are likely in the south possibly with thunderstorms. (nature adding an extra light show to the evenings entertainments?)
Sat 28th July
Cooler, with temps in the south in the low 20's. (In Scotland it looks bloody cold according to GFS, with temps struggling to reach 10C!) Unsettled with widespread showers.
"Sun 29th July*
Looking decidedly unsettled according to GFS with low pressure dominating and cool temps - mid to high teens pretty much across the UK. However ECMWF looks more optimistic with high pressure forming in the wings - so lets hope that is the more accurate model :)