Weather forecast for 10 daysPort Jefferson, NY
Weather forecast for the weekend
Sunday Oct 18, 2026
- 54°F
- 43°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 16mphNE 40°
- Humidity: 43%
- UV index: 4
- Sunrise: 7:07 am EDT
- Sunset: 6:07 pm EDT
- details ▼
Today, sunny skies are in store, with excellent visibility.
Predicted temperature values will span from a cool 53.6°F down to a chilly 42.8°F.
With a forecast of 53.6°F, the day’s weather feels closer to November than October.
Sunrise was at 7:07 am and sunset will be at 6:07 pm; the daylight will last for 11h and 1min.
Predicted temperature values will span from a cool 53.6°F down to a chilly 42.8°F.
With a forecast of 53.6°F, the day’s weather feels closer to November than October.
Sunrise was at 7:07 am and sunset will be at 6:07 pm; the daylight will last for 11h and 1min.
10-day overview
Daily temperatures
Warmest day: Tuesday 66°C.
Coldest day: today 54°C.
Coldest day: today 54°C.
Chance of precipitation
Highest chance: Thursday 18%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 54°F
- 43°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 16mphNE 40°
- Humidity: 43%
- UV index: 4
- Sunrise: 7:07 am EDT
- Sunset: 6:07 pm EDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 48°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 17mphNE 37°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:08 am EDT
- Sunset: 6:06 pm EDT
- details ▼
- Tuesday
- Oct 20, 2026
- 66°F
- 46°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 17mphNNE 24°
- Humidity: 56%
- UV index: 4
- Sunrise: 7:09 am EDT
- Sunset: 6:04 pm EDT
- details ▼
- Wednesday
- Oct 21, 2026
- 59°F
- 46°F
Mostly Sunny
- Precip. probability: 14%
- Precipitation: 0"
- Wind: 19mphNNE 31°
- Humidity: 63%
- UV index: 4
- Sunrise: 7:10 am EDT
- Sunset: 6:03 pm EDT
- details ▼
- Thursday
- Oct 22, 2026
- 63°F
- 45°F
Mostly Sunny
- Precip. probability: 18%
- Precipitation: 0"
- Wind: 14mphN 9°
- Humidity: 58%
- UV index: 4
- Sunrise: 7:11 am EDT
- Sunset: 6:01 pm EDT
- details ▼
- Friday
- Oct 23, 2026
- 57°F
- 41°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 15mphNNE 13°
- Humidity: 49%
- UV index: 4
- Sunrise: 7:12 am EDT
- Sunset: 6:00 pm EDT
- details ▼
- Saturday
- Oct 24, 2026
- 59°F
- 41°F
Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 11mphNE 34°
- Humidity: 54%
- UV index: 4
- Sunrise: 7:13 am EDT
- Sunset: 5:58 pm EDT
- details ▼
- Sunday
- Oct 25, 2026
- 61°F
- 45°F
Mostly Sunny
- Precip. probability: 8%
- Precipitation: 0"
- Wind: 7mphNNW 327°
- Humidity: 57%
- UV index: 4
- Sunrise: 7:15 am EDT
- Sunset: 5:57 pm EDT
- details ▼
- Monday
- Oct 26, 2026
- 64°F
- 48°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 8mphNW 311°
- Humidity: 58%
- UV index: 3
- Sunrise: 7:16 am EDT
- Sunset: 5:56 pm EDT
- details ▼
- Tuesday
- Oct 27, 2026
- 61°F
- 45°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 11mphN 2°
- Humidity: 62%
- UV index: 3
- Sunrise: 7:17 am EDT
- Sunset: 5:54 pm EDT
- details ▼
In the days ahead, primarily sunny and occasionally cloud-filled weather is anticipated.
Rainfall is not forecasted in Port Jefferson in the upcoming period.
Temperature fluctuation will be noticeable throughout the forecast window. Forecast highs will fluctuate between 53.6°F and 66.2°F, while the low temperature range extends from 41°F to 48.2°F.
With the highest temperature of 66.2°F, Tuesday will be the warmest day; today is the coldest day, with a maximum temperature of 53.6°F.
Rainfall is not forecasted in Port Jefferson in the upcoming period.
Temperature fluctuation will be noticeable throughout the forecast window. Forecast highs will fluctuate between 53.6°F and 66.2°F, while the low temperature range extends from 41°F to 48.2°F.
With the highest temperature of 66.2°F, Tuesday will be the warmest day; today is the coldest day, with a maximum temperature of 53.6°F.
Updated: Oct 18, 2026 @ 14:40:15 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, in Port Jefferson, sunshine will likely continue with scattered clouds at most.
Today, the maximum temperature will be 53.6°F, while the minimum temperature will be 42.8°F.
The highest temperature will be slightly cooler than the average maximum of 62.6°F in October. The lowest temperature today will be significantly lower than the average low of 55.4°F.
The highest temperature will be slightly cooler than the average maximum of 62.6°F in October. The lowest temperature today will be significantly lower than the average low of 55.4°F.
On Sunday, in Port Jefferson, sunrise was at 7:07 am and sunset will be at 6:07 pm (EDT).
Today, the daylight will last for 11h and 1min.
