Port Jefferson Weather Forecast 15 Days, Weather in Port Jefferson Today
Current weather conditions and 15 day weather forecast for Port Jefferson, New York, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Port Jefferson
| 22 December 2025 Monday 0.6 ° C / 33.1°F  Clear |
Feels Like : -5.8 ° C / 21.5°F Humidity : % 38 Pressure : 1025 mb Wind Speed : 31.3 kmph / 19.5 miles from WNW  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Port Jefferson, NY, USA
Weather Forecast for next 15 Days for Port Jefferson including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Port Jefferson, New York state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 21 December 2025 Sunday | Sunny |
-0.7 ° C (30.7°F) |
9.1 ° C (48.4°F) |
3.8 ° C (38.9°F) |
% 62 | 0% | 0.3 | Sunrise:07:14 AM Sunset: 04:27 PM |
Moonrise:08:49 AM Moonset: 05:45 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday |  Partly Cloudy |
-2.1 ° C (28.2°F) |
2.3 ° C (36.1°F) |
0.1 ° C (32.1°F) |
% 64 | 0% | 0.3 | Sunrise:07:14 AM Sunset: 04:28 PM |
Moonrise:09:26 AM Moonset: 06:50 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday |  Moderate rain |
0.7 ° C (33.3°F) |
3.8 ° C (38.8°F) |
2.2 ° C (35.9°F) |
% 89 | 85% | 0.1 | Sunrise:07:15 AM Sunset: 04:28 PM |
Moonrise:09:56 AM Moonset: 07:57 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday | Partly Cloudy |
0.9 ° C (33.6°F) |
6.5 ° C (43.7°F) |
3 ° C (37.4°F) |
% 79 | 0% | 0.3 | Sunrise:07:15 AM Sunset: 04:29 PM |
Moonrise:10:22 AM Moonset: 09:05 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday |  Patchy rain nearby |
0.6 ° C (33.2°F) |
5 ° C (41.1°F) |
3.1 ° C (37.6°F) |
% 72 | 88% | 0.2 | Sunrise:07:16 AM Sunset: 04:29 PM |
Moonrise:10:45 AM Moonset: 10:11 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday | Patchy rain nearby |
1.6 ° C (34.9°F) |
10.7 ° C (51.2°F) |
6.1 ° C (43°F) |
% 91 | 84% | 0 | Sunrise:07:16 AM Sunset: 04:30 PM |
Moonrise:11:07 AM Moonset: 11:20 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Sunny |
-2.2 ° C (28°F) |
0.9 ° C (33.6°F) |
-0.3 ° C (31.5°F) |
% 42 | 0% | 2 | Sunrise:07:16 AM Sunset: 04:31 PM |
Moonrise:11:29 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday | Patchy rain nearby |
0.1 ° C (32.1°F) |
5.3 ° C (41.5°F) |
3.7 ° C (38.7°F) |
% 75 | 89% | 1 | Sunrise:07:17 AM Sunset: 04:32 PM |
Moonrise:11:52 AM Moonset: 12:29 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday |  Overcast |
-5.8 ° C (21.5°F) |
-4.3 ° C (24.2°F) |
-4.3 ° C (24.3°F) |
% 55 | 0% | 1 | Sunrise:07:17 AM Sunset: 04:32 PM |
Moonrise:12:18 PM Moonset: 01:43 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday | Partly Cloudy |
-6 ° C (21.2°F) |
1.2 ° C (34.1°F) |
-1.9 ° C (28.6°F) |
% 57 | 0% | 2 | Sunrise:07:17 AM Sunset: 04:33 PM |
Moonrise:12:51 PM Moonset: 03:00 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday | Sunny |
-6.9 ° C (19.5°F) |
-4.3 ° C (24.3°F) |
-3.3 ° C (26.1°F) |
% 48 | 0% | 2 | Sunrise:07:17 AM Sunset: 04:34 PM |
Moonrise:01:34 PM Moonset: 04:20 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday | Partly Cloudy |
-3.7 ° C (25.3°F) |
4.2 ° C (39.6°F) |
1.3 ° C (34.3°F) |
% 58 | 0% | 2 | Sunrise:07:17 AM Sunset: 04:35 PM |
Moonrise:02:27 PM Moonset: 05:39 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday | Sunny |
3.3 ° C (37.9°F) |
6.4 ° C (43.5°F) |
5.2 ° C (41.4°F) |
% 86 | 0% | 3 | Sunrise:07:17 AM Sunset: 04:36 PM |
Moonrise:03:34 PM Moonset: 06:50 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Partly Cloudy |
0.9 ° C (33.7°F) |
7 ° C (44.6°F) |
4.6 ° C (40.2°F) |
% 68 | 0% | 2 | Sunrise:07:17 AM Sunset: 04:37 PM |
Moonrise:04:50 PM Moonset: 07:49 AM Moon Phase ( Full Moon ) |
|
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