In March, the average high temperature in Santa Clara is 65 degrees and low is 45 degrees. Santa Clara typically has quite nice weather year-round. However, please prepare to bring some cooler outfits for the evenings and be prepared for some precipitation.
Keep in mind that event room temperatures tend to fluctuate, please wear clothes in layers to ensure you are comfortable at all times.
Please search the internet for "15 day weather forecast santa clara" to get more of an idea of trends likely for the time of the conference (e.g. rain, gradually warmer).