Spells of rain embedded with downpours and thunderstorms are likely throughout Massachusetts on Saturday, according to the National Weather Service.

A near-universal 100% chance of precipitation is forecast across the Commonwealth from the Cape and Islands to the Berkshires.

For the Cape and Islands, showers are expected to persist until around 10 p.m. Saturday will see a high near 59 degrees, dropping to a low of 45 degrees in the evening with the possibility of patchy fog.

Rain is likely before 1 p.m. in Boston, with conditions transitioning to showers later in the day. Thunderstorms are possible after 4 p.m., although showers may diminish before 10 p.m. Patchy fog is anticipated, with a daytime high near 64 degrees and an overnight low of around 43 degrees, according to the National Weather Service.

Worcester’s weather includes rain before 4 p.m., followed by a chance of showers and thunderstorms. Temperatures will peak near 64 degrees during the day before falling to 43 degrees by Saturday evening.

For Springfield, thunderstorms are possible throughout the day, with showers likely until around 8 p.m. The high temperature is expected to be near 66 degrees, with an overnight low of approximately 44 degrees.

Greenfield residents can anticipate rain and thunderstorms throughout the day until 11 p.m., the weather service predicts. The high could reach near 68 degrees, with temperatures dropping to around 43 degrees by Saturday night.

For the Berkshires, showers and thunderstorms are also in the forecast for the entire day. The region may experience a high near 67 degrees, with an overnight low of around 40 degrees.