My girlfriend are planning or vacation in August. It runs from August 5th to the 20th and we were thinking about going to Nepal. However, we have heard that this is monsoon season and the weather is really bad. Has anyone been in Nepal during August and how was the weather?
Yes, you will be mid-monsoon, but it depends what you are doing as to how it will affect you.
Trekking may not be an issue if you are well prepared and used to the rain, but you may want to think about how you travel otherwise.
Nepal has a terrible record for landslides destroying roads and throwing coaches down mountainsides. Personally I wouldn't travel by bus in the country at this time of year.
If you're only flying, say from Kathmandu to Lukla or Pokhara, then you may be perfectly fine.