Warm and increasingly humid on Long Island through Tuesday, then dangerous heat builds for the second half of the week
Summer heat rapidly intensifies beginning Wednesday, with the hottest weather expected Thursday and Friday. Heat indices could approach or exceed 100, and an isolated thunderstorm becomes possible by next weekend.
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Alert: Excessive heat watch will be in effect from Wednesday afternoon through Friday evening.
What to Expect
Warm, mainly dry weather continues through Tuesday with increasing humidity.
Heat builds significantly Wednesday through Friday as an expanding upper-level ridge strengthens over the Northeast.
Thursday and Friday are shaping up to be the hottest days, with widespread 90s away from the immediate South Shore and heat indices potentially exceeding 100.
Warm nights in the 70s will provide little overnight relief from the heat.
A few afternoon or evening thunderstorms may develop by Saturday, with additional scattered showers possible Sunday as the ridge begins to weaken.
Forecast
Overnight: Partly cloudy, warm and increasingly humid. Temperatures in the mid-60s.
Monday: Partly sunny, warm and a bit more humid. Temperatures in the mid-80s.
Tuesday: Very warm, with a mix of sun and clouds. An isolated afternoon thunderstorm is possible. Temperatures in the mid- to upper 80s.
Wednesday: Mostly sunny, hot and humid. Temperatures around 90.
Thursday: Mostly sunny and dangerously hot. Temperatures in the mid 90s, with heat index values around or above 100.
Friday: Mostly sunny and oppressively hot. Temperatures in the mid 90s.
Saturday: Hot and humid, with a mix of sun and clouds. An afternoon thunderstorm is possible. Temperatures in the low to mid-90s.
Sunday: Partly sunny, still warm and humid, with scattered afternoon showers possible. Temperatures in the mid- to upper 80s.
