We will see seasonable weather for the next couple days. On Wednesday and Thursday it will be a bit colder. Once we get to Friday and the weekend some of the warmth from the western U.S. will come eastward and we'll see highs in the low to mid 40s in New York and Boston.
For the last couple weeks we've had a block over western Canada which has kept warm winds from coming in off the Pacific. Cold weather has come down from the north and this has spilled into the U.S.
It will cool down a bit Wednesday but still remain warmer than normal. By the weekend temperatures will fall to normal or maybe a few degrees below.
It looks like the block is ending and warm air will soon spill into the northern Rockies and Plains. It will take longer for the warm weather to make it to the Midwest and Northeast. In about 10 days we may see above-normal temperatures throughout the Northeast.