Short answer -- yes, but no.  :)

Longer answer....

In a recent conversation with a home seller, they wondered if they had missed out on the best time to sell their home since they wouldn't be ready to get their house on the market until July 1.  Let's take a look at what last year looked like from the perspective of when buyers signed contracts to purchase homes.  Based on the graph above....

1. Only slightly more than half (54%) of contracts signed in 2016 were signed before July 1. 
    
2. The most active months of contract signing were April (158), May (141) and March (133).  August was just after that, however, with 130 contracts and July was also quite strong with 119 contracts.  Thus, there are several more (at least two) months of strong buyer activity to come.
    
3. Contracts were signed at an average pace of 135/month between March and August.  The average pace of August (99) and September (109) was 104/month.  This is not a significant decline -- we're not talking about having only half as many buyers signing contracts per month once you get into September and October.  Even November had 93 contracts signed.
    
4. Certainly, if you were hoping to sell (close on) your house this summer (by Aug 31) then you would have been better off to list your home for sale earlier in the year -- but there are still plenty (!) of buyers who are likely to be signing contracts for the next several months.

As usual -- every segment of the market (based on price, location, property type) is a bit different -- so let me know if you want to chat more specifically about your home, and what it would look like to list your home for sale in the coming month to be aiming for one of these late-summer / early-fall buyers.