In the last year 149 condo's sold with a median price of $326,750
The year prior 188 condo's sold with a median price of $320,000
So it appears the transactions might have been lower this year but the median price remained the same / slightly increased. Right now there are 57 condo's on the market. Overall it seems to be a perfectly fine market to buy into plus the interest rates are low so perhaps you can get yourself a nice deal.
Here is every property on the market in Watertown: