New Yorkers wake up to clear skies on Sunday, May 17, 2026, with temperatures starting out in the upper 60s and a bright, mostly sunny day on tap that should push most boroughs into the upper 70s. Inland neighborhoods will run the warmest while the south shore of Long Island stays cooler near 70°F thanks to an onshore flow. If you are heading outside, bring sunscreen and water. Conditions are comfortable but noticeably warmer than recent days.
Afternoon Heat And Wind
Sunday’s high should land near 79°F, with southwest winds around 7 to 12 mph and occasional higher gusts later in the afternoon. Most of the city will top out in the mid to upper 70s, with a few inland spots nudging toward 80°F. The afternoon breeze will take the edge off the warmth and make waterfront areas feel cooler than inland neighborhoods.
Marine And Water Safety
A Small Craft Advisory remains in effect for the ocean waters through early this afternoon, and seas will be choppy, so boaters should expect rough conditions and plan accordingly. Water temperatures are still in the lower 50s, which poses a real hypothermia risk for anyone entering the water. Small boats, kayaks and paddlecraft should wear life jackets and avoid swamping. For the latest zone and advisory details, see the National Weather Service.
What To Expect This Week
A shallow backdoor front will trim temperatures a bit on Monday, May 18, 2026, with highs closer to the low 70s. Warmer air returns Tuesday and Wednesday, May 19 to 20, 2026. Tuesday looks summerlike, with highs in the mid 80s. An approaching cold front will likely spark showers and thunderstorms from Wednesday afternoon into the evening, followed by more seasonable highs later in the week. If you or someone you care for is sensitive to heat, the city maintains cooling resources and guidance at NYC Emergency Management.
Quick Tips
Outdoor plans for Sunday are generally in good shape. Start early or aim for late afternoon to sidestep the warmest hours, and plan on a steady southwest breeze. If you are heading out on the water, treat conditions as rough and keep a conservative safety margin. Check forecasts before leaving the dock and carry a life jacket. For midweek outdoor events, keep an eye on the forecast. Scattered storms are increasingly likely on Wednesday, May 20, 2026.
