Tell us about yourself!
It probably could. But if you're in the US, that's illegal, since you'd be interfering with broadcast transmissions.
I just did a test, and got temperature values about 6 degrees Fahrenheit lower powering the Arduino from a 9v a wall power supply versus from my laptop's USB ports.
You can try using a different source of power for your project. I have had issues with the sensor reading incorrect values when I am powering the Arduino from certain USB devices and wall power supplies.