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      Flood Watch
      until 2:00 AM EDT
      Elev 89 ft, 40.935 °N 73.127 °W

      Setauket, NY

      Head of the Harbor Station
      Updated: 1:34 PM EDT on August 20, 2026 (GMT -4)
      6 minutes ago
      86°
      67°
      83
      Feels Like 86
      Cloudy
      N
      6
      Similar temperature is expected today
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
      Today
      Thu 08/20
      High 85°f
      56% Precip. / 0.01 in
      Cloudy with showers. High near 85F. Winds S at 5 to 10 mph. Chance of rain 60%.
      Tonight
      Thu 08/20
      Low 66°f
      99% Precip. / 1.03 in
      Rain early...then remaining cloudy with showers overnight. Low 66F. Winds NE at 10 to 15 mph. Chance of rain 100%. Rainfall near an inch. Localized flooding is possible.
      Tomorrow
      Fri 08/21
      High 76°f66°f
      24% Precip. / 0 in
      Mostly cloudy. High 76F. Winds NE at 10 to 20 mph.
      Hourly Forecast
      Now
      84°
      2PM
      56%
      70°
      3PM
      40%
      78°
      4PM
      81°
      5PM
      30%
      79°
      6PM
      38%
      77°
      7PM
      88%
      73°
      7:43PM
      Sunset
      8PM
      99%
      70°
      9PM
      92%
      68°
      10PM
      91%
      68°
      11PM
      78%
      68°
      12AM
      78%
      68°
      1AM
      57%
      68°
      2AM
      59%
      68°
      3AM
      55%
      68°
      4AM
      44%
      68°
      5AM
      45%
      67°
      6AM
      45%
      67°
      6:08AM
      Sunrise
      7AM
      42%
      67°
      8AM
      68°
      9AM
      69°
      10AM
      69°
      11AM
      71°
      12PM
      72°
      1PM
      73°
      Precipitation
      99%
      Rain likely around 2:15 PM
      Pollen
      Grass Pollen
      Low
      Air Quality
      49
      Good
      UV Index
      3
      Moderate
      Additional Conditions
      1. Pressure 29.97 in
      2. Visibility 10 miles
      3. Clouds Cloudy
      4. Dew Point64°F
      5. Humidity 52%
      6. Rainfall 0 in
      7. Snow Depth 0 in
       KISP Station History
      Almanac for August 20, 2026
      1. Forecast Average Record
      2. Temperature
      3. High 86°F 82°F 93°F 1937
      4. Low 67°F 65°F 51°F 1964
      5. Rain/Snow Depth
      6. Precipitation 1.04 in - in -
      7. Snow 0 in - in -
      Almanac for August 21, 2026
      1. Forecast Average Record
      2. Temperature
      3. High 76°F 82°F 95°F
      4. Low 67°F 65°F 50°F
      Astronomy
      1. Sun Rise Set
      2. Actual Time 6:07 AM 7:43 PM
      3. Civil Twilight 5:38 AM 8:12 PM
      4. Nautical Twilight 5:03 AM 8:47PM
      5. Astronomical Twilight 4:25 AM 9:24 PM
      1. Length of Visible Light 14h 34m
      2. Length of Day 13h 36m
      3. Tomorrow will be 2 minutes 30 seconds shorter
      1. Moon 2:46 PM 11:36 PM
      2. Waxing Gibbous56% of the Moon is Illuminated
      Aug 28
      Full Moon
      Sep 4
      Waning Half Last Qtr
      Sep 10
      New Moon
      Sep 18
      Waxing Half First Qtr
      Precipitation
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