Wikipedia has this link
 
http://www.pyngl.ucar.edu/Nio.shtml
 
 Does it do the job?
 
  Nadav
 
From: numpy-discussion-bounces@scipy.org [numpy-discussion-bounces@scipy.org] On Behalf Of dileep kunjaai [dileepkunjaai@gmail.com]
Sent: 08 April 2011 15:21
To: Discussion of Numerical Python
Subject: [Numpy-discussion] netcdf to grib format

Dear sir,
 Is there any tool for changing the  'netcdf' file format to 'grib' format in python or cdat

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DILEEPKUMAR. R
J R F, IIT DELHI