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
| 21 September 2026 Monday 19.8 ° C / 67.6°F  Patchy rain nearby |
Feels Like : 19.4 ° C / 66.9°F Humidity : % 91 Pressure : 1014 mb Wind Speed : 17.3 kmph / 10.7 miles from S  Visibility : 10 km Precipitation (rainfall) : 0.15 mm Cloud (%) : 96 |
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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 September 2026 Sunday |  Light drizzle |
16.2 ° C (61.2°F) |
20.3 ° C (68.5°F) |
18.3 ° C (64.9°F) |
% 82 | 86% | 0.7 | Sunrise:06:37 AM Sunset: 06:53 PM |
Moonrise:04:13 PM Moonset: 12:28 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday |  Overcast |
16.4 ° C (61.5°F) |
20.7 ° C (69.2°F) |
18.3 ° C (65°F) |
% 70 | 23% | 5.6 | Sunrise:06:38 AM Sunset: 06:51 PM |
Moonrise:04:43 PM Moonset: 01:30 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Patchy rain nearby |
13.2 ° C (55.7°F) |
17.6 ° C (63.8°F) |
15 ° C (58.9°F) |
% 78 | 87% | 1.3 | Sunrise:06:39 AM Sunset: 06:50 PM |
Moonrise:05:09 PM Moonset: 02:33 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday | Overcast |
13.3 ° C (56°F) |
17.1 ° C (62.8°F) |
15 ° C (58.9°F) |
% 73 | 38% | 1.6 | Sunrise:06:40 AM Sunset: 06:48 PM |
Moonrise:05:31 PM Moonset: 03:35 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Overcast |
12.7 ° C (54.9°F) |
17.5 ° C (63.5°F) |
15.3 ° C (59.5°F) |
% 70 | 29% | 2 | Sunrise:06:41 AM Sunset: 06:46 PM |
Moonrise:05:51 PM Moonset: 04:37 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday |  Light rain shower |
11.9 ° C (53.4°F) |
15.5 ° C (59.8°F) |
13.5 ° C (56.2°F) |
% 77 | 86% | 3 | Sunrise:06:42 AM Sunset: 06:45 PM |
Moonrise:06:11 PM Moonset: 05:39 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday | Light rain shower |
13.6 ° C (56.5°F) |
17 ° C (62.7°F) |
15.4 ° C (59.6°F) |
% 79 | 87% | 4 | Sunrise:06:43 AM Sunset: 06:43 PM |
Moonrise:06:31 PM Moonset: 06:41 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Patchy rain nearby |
14.1 ° C (57.3°F) |
16.9 ° C (62.4°F) |
15.6 ° C (60°F) |
% 69 | 21% | 4 | Sunrise:06:44 AM Sunset: 06:41 PM |
Moonrise:06:53 PM Moonset: 07:45 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Overcast |
14.3 ° C (57.8°F) |
17.9 ° C (64.2°F) |
15.8 ° C (60.4°F) |
% 72 | 24% | 4 | Sunrise:06:45 AM Sunset: 06:39 PM |
Moonrise:07:18 PM Moonset: 08:51 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
13.5 ° C (56.3°F) |
19.1 ° C (66.4°F) |
15.9 ° C (60.7°F) |
% 79 | 21% | 5 | Sunrise:06:46 AM Sunset: 06:38 PM |
Moonrise:07:47 PM Moonset: 09:59 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Light rain shower |
14.7 ° C (58.4°F) |
18.3 ° C (64.9°F) |
16.1 ° C (60.9°F) |
% 95 | 93% | 4 | Sunrise:06:47 AM Sunset: 06:36 PM |
Moonrise:08:24 PM Moonset: 11:10 AM Moon Phase ( Waning Gibbous ) |
|
| 01 October 2026 Thursday | Patchy rain nearby |
18.5 ° C (65.3°F) |
20.3 ° C (68.5°F) |
19.5 ° C (67.1°F) |
% 94 | 78% | 6 | Sunrise:06:49 AM Sunset: 06:34 PM |
Moonrise:09:10 PM Moonset: 12:19 PM Moon Phase ( Last Quarter ) |
|
| 02 October 2026 Friday | Light rain shower |
17.1 ° C (62.8°F) |
21.3 ° C (70.4°F) |
19 ° C (66.2°F) |
% 88 | 89% | 5 | Sunrise:06:50 AM Sunset: 06:33 PM |
Moonrise:10:08 PM Moonset: 01:25 PM Moon Phase ( Last Quarter ) |
|
| 03 October 2026 Saturday |  Sunny |
15.8 ° C (60.4°F) |
20.1 ° C (68.1°F) |
17.7 ° C (63.8°F) |
% 62 | 4% | 6 | Sunrise:06:51 AM Sunset: 06:31 PM |
Moonrise:11:16 PM Moonset: 02:22 PM Moon Phase ( Last Quarter ) |
|
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