Mary, I went in March 2014 and the weather was just about right. I went swimming in a couple of hotel outdoor pools (Jaipur and Varanasi) and overall the holiday and weather were excellent.
Along with about 7 other travellers in the group, I got the dreaded 'Dehli belly' despite sticking to advice I had read earlier before travelling - no salads, only fruit that can be peeled and certainly no street food. However it lasted less than 24 hours and the Tour Manager made sure we all had a visit from a local doctor who prescribed pills and advice on drinking loads of water and eating just bananas for the day/night. Fortunately the day we were poorly was a day with no travelling and allocated as an R&R day after our early starts and busy previous few days so we missed none of the sights and excursions and all were back to fighting fit after 24 hours or so.
Part of the Indian experience I guess .. have fun wherever your travelling takes you.
Pete ..............