There is no down side to buying on the weekend from my experience in buying at this time with only buying as you say, a hundred bucks worth of coins or bars any movement up or down would be minimal on any buy you make.
FYI If you are new to buying silver or gold, no one I know of can predict future priced of precious medals or anything else accurate from my experience. Hell look at the 2012 end of the world predictions, well here it is 2015 the world is still here, look at the historical other doom and glooms being predicted for thousands of years, none I know of have ever happened as they said it would. In a few words do what you feel in right for you, you are the one who has to live with your decision!