My weather station is pretty cheap :
I look out the front and back windows - if it's cloudy - it might rain (I also note if the little black ants are climbing higher up - if they are it's definitely going to rain) , if it's sunny it probably wont .
If I go outside and it's warm , I smile , if it's cold , I go back inside unless I have to do something outside.
If I want to know what weather is likely tomorrow or later on the same day I go to the BOM and look at the charts , and I visit ABC's Weather Link and see where the radar says the rain is and what way it's going.
Costs me nothing.