Geese and seagulls take advantage of a large puddle in a...

Geese and seagulls take advantage of a large puddle in a parking lot at Heckscher State Park in East Islip as they cool off on Sunday. Credit: James Carbone

The National Weather Service has issued a heat advisory for western Long Island and the region through Monday night, with Tuesday looking almost as warm and sticky. 

In a briefing Sunday afternoon, the service said heat indexes of between 95 and 100 degrees are expected Monday in the region except for eastern Long Island. That's how it feels when the air temperature and relative humidity are factored in. The advisory expires at 8 p.m. Monday.

"Hot and humid weather will continue through the beginning of the week as the cool air remains bottled up in Canada," the service said in the briefing. "High temperatures in the 80s and lower 90s both Monday and Tuesday will produce heat index values upwards of 100 in places."

The scattered storms predicted to take place on and off Sunday, Monday and Tuesday aren't expected to provide much relief, the service said. But gradually, as the week goes on, temperatures are forecast to go down with a chance of showers and storms every day through Thursday.

The weather is expected to dry up for the weekend, starting Friday and going into Saturday. Both days will be dry and sunny with a high near 80, the weather service said.