A model experimental adobe room with and without water pond on its roof was investigated in Sokoto. Solar radiation, outer walls and inner walls temperatures, ambient as well as room temperatures and relative humidity were measured in order to ascertain the best room for onion storage. was found that adobe room without water pond has lower range of room temperatures compared with the room with water pond. The internal temperature of room (with or without water pond) is less than the ambient temperature during the sunshine hours of the day but converse is the case in the night hours. Furthermore, in the early morning hours the ranges of internal relative humidity for the room are within the range suitable for onions storage.