It will become more humid overnight as a warm front pushes through western Massachusetts late. The front will bring a few late night showers and possibly a thunderstorm into Saturday morning.
Any rain will end early giving way to some sunshine by midday along with a very humid feel. With the build-up of humidity there is the chance for a couple of showers and thunderstorms during the second half of the afternoon and early evening as another weak impulse moves through. An isolated storm could be strong to severe with damaging winds. So, showers are possible on the "bookends" Saturday.
Sunday looks much warmer! In fact, now it looks to get as hot as the mid-90s in the valleys Sunday afternoon under a mix of sun and clouds. Just an isolated late day or evening pop-up storm is possible.