We did a May trip in 2001. Daytime temps hit 95 and nights cooled to 85. No breeze at all. The boat heated up during the day to 100 plus and at night never cooled down. Fans and wind scoops were useless. We slept on the deck on cockpit cushions. Maybe not the norm for that time of year. If I suggested a trip in May-October without AC my wife would not come. I could handle it but why? We are not living in the old days when sailors suffered all the time and now like to recount those stories. AC is available. Get it and then you don't have to worry about mid night hatch runs or days with rain.