I do this by putting scripts in the /etc/init.d folder. Here's an example:
#Used this as a guide http://myraspberrypiexperience.blogspot.co.uk/2012/08/star
eval cd ~$USER
#Run the Airpi
su $USER -c 'sudo python /home/pi/Meteoros/pdw_upload_v3.py &'
It was interesting to look at the temperature profile, (chart for the 25th shown below):