Rain and Flash Flooding Possible on Long Island Sunday
Rain and Flash Flooding Possible on Long Island Sunday
US · Published Sep 18, 2026
• Long Island is set to experience a stretch of wet and chilly weather starting Sunday, September 20,
• While Friday and Saturday will feature pleasant conditions with highs near 80°F (27°C) and 70°F (21°C) respectively, Sunday will bring on-and-off showers throughout the day. Heavy rain is expected in the afternoon and evening, with flash flooding possible. Temperatures will remain steady in the 60s°F (15-20°C). The gloomy weather is forecast to persist into next week, with cloudy skies, breezy conditions, and occasional showers.

Impact & Risks

The primary risk is flash flooding on Sunday afternoon and evening due to heavy rainfall. Residents in flood-prone areas should remain alert. The cooler and wet conditions may also impact outdoor plans and travel. Breezy conditions early next week could add to the discomfort.

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