Port Jefferson Rainfall Forecast

  • 10%
  • No Rain
  • 5%
  • 5%
  • 20%
  • 45%
  • 20%
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Port Jefferson Rainfall Statistics

January Rainfall

Islip, Long Island Mac Arthur Airport (10.6 miles)

  • Total Rainfall January

    2.4in

  • Daily Average January

    0.1in

  • Wettest Day 25 January, 2026

    1in

  • Wet Days January

    10/27 (37%)

Climate (2010–Present)

Islip, Long Island Mac Arthur Airport (10.6 miles)

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  • Annual Average 2021–2025

    44.1in

  • Monthly Average 2021–2025

    3.7in

  • Daily Average 2021–2026

    0.1in

  • Wettest Day 16 July, 2023

    4.6in
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