Funnily enough it was cloudy, but dry - until just gone 5 when it did start to spit a bit.
And I was right - I got there at 10 and didn't leave until about 5:30. Did my bit, but the commissioning guy couldn't get the one controller to work (Its one I'm not overly familiar with, but know its one I wouldn't choose!) and can't see the sensors on the network on the one that does (But I know they work because I set them up locally. But I know there is an issue with the wiring/connector because one of the 4 flashes red when plugged into the network, rather than green like the others.