The weather for May 15-17th has taken a turn for the worse. Friday looks to be sunny, but Saturday and Sunday are set to rain. Be sure to bring something along the lines of a raincoat, or at least a light waterproof windbreaker as well as an umbrella. On Saturday we will be having a fairly long outdoor lunch at the UBC Botanical Gardens, so be sure to bring something you will be comfortable in outdoors.
An up to date weather forecast for Vancouver can be found here.