Well, we certainly have "weather" here in London.

In March, you are sure to have a mixture of clouds, rain, some sunshine, wind... It may be fairly mild (high 50s, low 60s) or fairly chilly (40s). Certainly not hot, hopefully not too cold

You are most likely to have four seasons in every week during March - so pack everything (leave your shorts & t shirts at home though!) - you're sure to need some sort of coat too!