Extreme heat is expected for the Hudson Valley on Sunday.

Heat index values could exceed 105 degrees on Monday and Tuesday, posing a risk of heat-related illnesses.

A thunderstorm is possible Sunday morning, but otherwise, the forecast remains mostly dry through the period.

SUNDAY: Heat wave begins. A morning thunderstorm is possible. High temperatures will soar into the mid-90s inland, in the 80s for the beach and east. It will feel like more than 100 degrees.

MONDAY: Record heat possible. Extreme heat is likely. Heat index values could reach 110 degrees with temperatures in the upper 90s. Temperatures near 90 for the beach and east.

TUESDAY: Another record hot day possible. Extreme heat is likely. It will be the hottest day of the week. Heat index values could reach 110 degrees. Temperatures may approach 100 inland. Temperatures near 90 for the beach and east.

WEDNESDAY: Less extreme heat. Hot and mainly sunny. Highs in the upper 80s.

REST OF THE WEEK: More seasonable. Temperatures return to normal. Highs will be in the low 80s. Rain is not likely.