Oregon Scientific’s BHT668A is a modular, cable-free mini weather station. It’s comprised of four different instruments: a barometer, a rain gauge, an indoor module that displays and records rainfall data and a thermo-hygrometer. That one measure humidity. Since it’s modular you can break up the four parts and have them in different rooms or whatever. You can have a “Humidity Room” or a “Rain Room.” And you could lose all your friends, too!
You could drop $200 on this baby, or just load and reload SimpleWeather like I do. That’s what the cool kids do.