It's the question everyone wants to know - what's the weather going to be doing on Sunday?
After weeks and even months of hard work, will the skies be playing ball as you head out on your 13.1 mile challenge.
Well according to forecast, it's not looking great.
A band of rain is due to head in from the west, turning drier and clearer behind that.
Sadly, things are set to get off to a pretty miserable start, with heavy rain and a moderate breeze on the go from the morning.
It won't be freezing though, with temperatures expected to sit at around 15 degrees.
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