no. the most accurate way is to create bogus adwords ads and count the page impressions. in this case, you don't want the person to click on your ad because that will cost you money. all you are interested in is the adwords stats that show how many times your keyword resulted in a page impression. so don't make your ad very appealing.
let it run a day or two and you'll know which keywords are actually being searched on CURRENTLY.
This!
The google keyword tool is notorious for being horribly wrong!
Artful is correct, even running your ad at a 'peak' time gives you a rough estimate..One of my domains is ranked #1 on G for a two word keyword - the adwords keyword tool says it gets 1.3 mil monthly US searches & I get 1-5 visitors a day from this keyword XD
Did you choose broad or exact match? Broad results are accurate, but they are results for your keyword + all sorts of modifiers, the exact keyword might actually get no searches.