I would download the free stereo (two-track) editor Audacity and use the included Noise Reduction Tool along with the EQ. If there are parts with very low level voice you might want to use a compressor to bring both the volume of the voice up as well as the wind noise. The reason being noise reduction works best with a strong signal. You will find a clean example of the wind noise, highlight it, select the noise reduction plugin and it will analyze the sample, this analysis can then be applied to the file with user set parameters.
Always work with a copy of the file.
Disclaimer: I'm not affiliated with the open source Audacity Project. A couple of years ago I was trying out Audacity for a student and found it to be both simple and powerful. I use a lot of different software, each has it's purpose, I found the Audacity noise reduction to work remarkably well.
http://audacity.sourceforge.net/download/mac
On the same page there's quite a few plugins as well.