Partly sunny skies and temperatures in the mid- to upper-70s are in store for Long Island Monday, the National Weather Service said.
For most of Nassau and Suffolk, daytime conditions will be warm, with a south wind from 10 to 15 mph.
But foggy conditions will linger on the South Shore for most of the day, said Tim Morrin, a meteorologist at Upton.
In a special statement, the service said persistent fog will remain across southern Nassau and southern Suffolk, including into the ocean waters.
Morrin said the fog will be an issue until 4 p.m., with visibility in some areas reduced to one-quarter mile.
News 12 Long Island meteorologist Rich Hoffman said conditions for the next 24 hours will be "warm and humid."
There is a chance for some spotty showers and storms late Monday but he forecasts "a lot more dry time than wet."
Remnants of Tropical Storm Ana bounced east into the Atlantic, taking any chance of heavy rain for Long Island with it. Hoffman said any significant rain associated with the system will be well south.
Hoffman said the warmer spots Monday will be north, especially along shorelines in Nassau County, where it could reach 80 degrees.
Overnight, conditions are likely to be foggy with temperatures dropping into the 60s.
Partly cloudy skies and daily highs close to 80 are expected Tuesday.