Holtsville, NY Weather

Suffolk County1:56 PM EDT40.82°N, 73.05°WElevation 105 ft

Current conditions

Clear
63°
Clear
Feels like 63°
High 62°·Low 48°
WindNW 3 mph
Humidity55%
Dew point43°
Pressure30.54 inHg
Visibility10 mi
Cloud cover9%
Sunrise7:15 AM
Sunset5:59 PM

Observed at Islip, Long Island Mac Arthur Airport · 1 hr ago

Forecast

10-day

  • Sunday

    Sunny, with a high near 62.

  • Sunday Night

    Mostly clear, with a low around 48.

  • Monday

    Mostly sunny, with a high near 65.

National Weather Service forecast updated 5 days ago.

Hourly

Hourly forecast
  1. Now Sunny 59°
  2. 2 PM Sunny 60°
  3. 3 PM Sunny 61°
  4. 4 PM Sunny 61°
  5. 5 PM Sunny 60°
  6. 6 PM Clear 59°
  7. 7 PM Clear 58°
  8. 8 PM Mostly Clear 56°
  9. 9 PM Mostly Clear 55°
  10. 10 PM Mostly Clear 53°
  11. 11 PM Mostly Clear 52°
  12. Mon12 AM Mostly Clear 51°
  13. 1 AM Mostly Clear 50°
  14. 2 AM Mostly Clear 50°
  15. 3 AM Mostly Clear 50°
  16. 4 AM Mostly Clear 49°
  17. 5 AM Mostly Clear 49°
  18. 6 AM Sunny 48°
  19. 7 AM Sunny 48°
  20. 8 AM Mostly Sunny 49°
  21. 9 AM Mostly Sunny 51°
  22. 10 AM Mostly Sunny 54°
  23. 11 AM Mostly Sunny 57°
  24. 12 PM Mostly Sunny 59°

10-day forecast

Details
  1. TonightOct 19 Mostly Clear Mostly Clear46°
  2. TueOct 20 Sunny Sunny46°65°
  3. WedOct 21 Mostly Sunny Mostly Sunny45°59°
  4. ThuOct 22 Mostly Sunny Mostly Sunny43°64°
  5. FriOct 23 Sunny Sunny42°56°
  6. SatOct 24 Sunny Sunny45°56°
  7. TodayOct 25 Sunny Sunny48°62°
  8. MonOct 26 Mostly Sunny Mostly Sunny65°
  9. TueOct 27 Cloudy Cloudy0.04 in51°64°
  10. WedOct 28 Cloudy Cloudy0.05 in49°57°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news near Holtsville

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Air quality

Forecast

  • SunModerate (52)
  • MonModerate (58)

Stratford, CT reporting area. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:15 AM
Sunset 5:59 PM
Daylight 10 h 43 min (−2 min 30 s tomorrow)
Full Moon · 100% lit
Moonrise 5:17 PM Moonset 6:36 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low61° / 44°
Month to date1.98 in (normal 3.11 in)

Islip Area, records since 1963. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in OKX, issued 10 hrs ago

What Has Changed

No significant changes made since the previous update.

Key Messages

1) Frost Advisory in effect this morning for coastal CT and far eastern LI.

2) High pressure largely in control through the upcoming week.

Key Message 1

Very favorable conditions exist this morning for radiational cooling and as a result, more typical spots have cooled significantly, some spots into the upper 20s. While the growing season has ended across the interior, it has yet to do so at the coast (Nov 1 or 11). Thus, a frost advisory in in effect for these areas once again.

Elsewhere, lows will range from the upper 20s across some of the interior, to as warm as the 40s across the NYC metro. These readings are about 3 to 5 degrees below normal for most locations.

Warm advection with building heights aloft should result in warmer temperatures tonight and less coverage of frost.

.KEY MESSAGE 2... An anomalously strong upper ridge from the Lower Mississippi Valley into the Great Lakes will translate east into Monday. A the same time, a strong upper low tracking across central and eastern Canada will suppress the upper ridge to the south, sending a cold front across the area Monday night. The frontal passage will be dry. Otherwise, the forecast area will be dominated by high pressure through the week.

Highs will be in the 60s Sunday and Monday, possibly getting to around 70 in the NYC/NJ metro on Monday. It will then cool down behind the cold front Monday night with highs mainly in the 50s for Tuesday and Wednesday. This will be a few degrees above normal. Frost coverage at the coast, where the growing season remains in effect, looks to be patchy at this time.

It warms up for the second half of the week with temperatures projecting to be well above normal by next Friday.

Outlook For 06z Monday Through Thursday

Sunday night-Thursday: VFR.

Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use. How to use Weather