Your Raspberry Weather station will be sitting outside. Therefore it is most wise to make a protective case, that will hold the Raspberry Pi along with the breadboard and wiring. The sensor itself should be outside of the case. By doing that you minimize the interference from the device itself that does emit some heat after a while. Not to mention the heat that accumulates inside the protective case. If you use a Wifi dongle it even gets a bit easier, because you do not have to worry about another cable.One of the options I found out to be pretty good is using a Tupperware container – it does not have to be Tupperware itself but something in that direction. I found one such container and decided to buy it because the lid clips on to the bottom part and it’s supposed to be water proof.