The weather right now is about as dreadful as it gets in London. It is raining, sleeting and it's cold. We don't get proper winter, just bone aching damp and cold. Despite the fact that it is raining solidly, we are also in the middle of a drought. Only in England. Here's the forecast. http://uk.weather.com/weather/local/UKXX0752
I hope you'll have a good time while you are here though. It's much more pleasant being a visitor.