Best year time to visit Port Jefferson

General weather information about Port Jefferson

Average annual temperature is 12.7 °C

Absolute maximum temperature: 33.0 °C

Absolute minimum temperature: -15.8 °C

Number of sunny days: 165 days

Number of rainy days: 193 days

Number of snow days: 7 days

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* Weather data for Port Jefferson United States is based on climate observations for 2026 year

Port Jefferson air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)17.619.213.527.726.927.431.928.933.024.818.516.5
Average daytime temperature (°C)7.86.99.016.219.223.128.126.123.418.711.08.9
Average temperature (°C)4.73.24.911.514.618.824.122.419.914.97.25.7
Average night temperature (°C)2.0-0.41.68.010.915.520.919.317.212.04.13.0
Absolute minimum temperature (°C)-2.0-15.8-2.61.06.610.117.216.912.57.2-2.0-3.6

Port Jefferson monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.610.611.913.314.515.114.813.812.511.19.99.3
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)4.96.77.68.712.311.411.710.47.98.07.35.5
Precipitation (mm)1445314411061701591522659767177
Sunny days9151614201181111131819
Rainy days201014161119232019181112
Snow days231000000010

Port Jefferson - weather forecast by months

Port Jefferson weather in januaryPort Jefferson weather in februaryPort Jefferson weather in marchPort Jefferson weather in aprilPort Jefferson weather in mayPort Jefferson weather in junePort Jefferson weather in julyPort Jefferson weather in augustPort Jefferson weather in septemberPort Jefferson weather in octoberPort Jefferson weather in novemberPort Jefferson weather in december

Best time to visit Port Jefferson:

The best time to visit Port Jefferson during the most sunny months:

  • May — 12.3(h)
  • June — 11.4(h)
  • July — 11.7(h)

The largest precipitation sum in Port Jefferson is at

  • July — 159(mm)
  • September — 265(mm)
  • December — 177(mm)

    • Weather forecast in the closest to Port Jefferson admin centers

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    Frequently asked questions

    When is the best time to visit Port Jefferson?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Port Jefferson.
    What is the weather like in Port Jefferson?
    See average temperature, rainfall and daylight hours for Port Jefferson by month in the table above.
    How many sunny days does Port Jefferson have?
    The monthly weather statistics above show sunshine and rainfall patterns for Port Jefferson throughout the year.