I was speaking with someone from Oklahoma City this afternoon, who commented that our warm, muggy day felt like a late autumn day back home in Oklahoma. When this person left their hometown yesterday, her thermometer registered 106 degrees! With that in mind, I'm not going to complain (much) about our warm, muggy conditions.
The warm, humid air will stay with us through the weekend, as high pressure will control our weather pattern through the period. Look for increasing clouds late Sunday as an area of low pressure moves our way from the west. That low will drag a frontal boundary across Maine, which will trigger some showers and thundershowers Sunday night into Monday. Behind that front some cooler air will arrive as we begin the new work-week.