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
| 08 May 2026 Friday 8.9 ° C / 48°F  Partly cloudy |
Feels Like : 6.9 ° C / 44.4°F Humidity : % 71 Pressure : 1012 mb Wind Speed : 12.6 kmph / 7.8 miles from NW  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 75 |
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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 08 May 2026 Friday |  Sunny |
9 ° C (48.2°F) |
17.9 ° C (64.2°F) |
12.4 ° C (54.4°F) |
% 53 | 0% | 6.5 | Sunrise:05:42 AM Sunset: 07:56 PM |
Moonrise:01:24 AM Moonset: 10:51 AM Moon Phase ( Waning Gibbous ) |
|
| 09 May 2026 Saturday |  Moderate rain |
10.8 ° C (51.5°F) |
14.8 ° C (58.7°F) |
12.4 ° C (54.2°F) |
% 76 | 87% | 3.2 | Sunrise:05:41 AM Sunset: 07:57 PM |
Moonrise:01:54 AM Moonset: 11:56 AM Moon Phase ( Last Quarter ) |
|
| 10 May 2026 Sunday |  Patchy rain nearby |
12.2 ° C (53.9°F) |
17.1 ° C (62.8°F) |
14.5 ° C (58.2°F) |
% 85 | 88% | 6.3 | Sunrise:05:40 AM Sunset: 07:58 PM |
Moonrise:02:19 AM Moonset: 01:02 PM Moon Phase ( Waning Crescent ) |
|
| 11 May 2026 Monday | Moderate rain |
8.2 ° C (46.8°F) |
11.3 ° C (52.3°F) |
10.6 ° C (51°F) |
% 79 | 87% | 3.9 | Sunrise:05:39 AM Sunset: 07:59 PM |
Moonrise:02:42 AM Moonset: 02:09 PM Moon Phase ( Waning Crescent ) |
|
| 12 May 2026 Tuesday | Sunny |
8 ° C (46.4°F) |
15.6 ° C (60°F) |
10.9 ° C (51.6°F) |
% 57 | 0% | 1 | Sunrise:05:38 AM Sunset: 08:00 PM |
Moonrise:03:05 AM Moonset: 03:19 PM Moon Phase ( Waning Crescent ) |
|
| 13 May 2026 Wednesday | Patchy rain nearby |
11 ° C (51.8°F) |
12.5 ° C (54.6°F) |
12 ° C (53.6°F) |
% 79 | 72% | 3 | Sunrise:05:37 AM Sunset: 08:01 PM |
Moonrise:03:27 AM Moonset: 04:30 PM Moon Phase ( Waning Crescent ) |
|
| 14 May 2026 Thursday | Patchy rain nearby |
10.6 ° C (51.1°F) |
12.6 ° C (54.7°F) |
11.5 ° C (52.8°F) |
% 93 | 87% | 3 | Sunrise:05:36 AM Sunset: 08:02 PM |
Moonrise:03:51 AM Moonset: 05:46 PM Moon Phase ( Waning Crescent ) |
|
| 15 May 2026 Friday | Partly Cloudy |
10.8 ° C (51.4°F) |
17.6 ° C (63.7°F) |
14.4 ° C (58°F) |
% 63 | 0% | 4 | Sunrise:05:35 AM Sunset: 08:03 PM |
Moonrise:04:19 AM Moonset: 07:06 PM Moon Phase ( Waning Crescent ) |
|
| 16 May 2026 Saturday | Patchy rain nearby |
12.7 ° C (54.8°F) |
16.3 ° C (61.3°F) |
14.3 ° C (57.8°F) |
% 65 | 77% | 3 | Sunrise:05:34 AM Sunset: 08:04 PM |
Moonrise:04:55 AM Moonset: 08:28 PM Moon Phase ( New Moon ) |
|
| 17 May 2026 Sunday | Patchy rain nearby |
11.4 ° C (52.5°F) |
18.1 ° C (64.6°F) |
14.1 ° C (57.4°F) |
% 67 | 74% | 3 | Sunrise:05:33 AM Sunset: 08:05 PM |
Moonrise:05:39 AM Moonset: 09:47 PM Moon Phase ( Waxing Crescent ) |
|
| 18 May 2026 Monday | Patchy rain nearby |
11.7 ° C (53°F) |
15.8 ° C (60.5°F) |
13.2 ° C (55.8°F) |
% 71 | 85% | 3 | Sunrise:05:32 AM Sunset: 08:06 PM |
Moonrise:06:36 AM Moonset: 10:57 PM Moon Phase ( Waxing Crescent ) |
|
| 19 May 2026 Tuesday | Sunny |
11.3 ° C (52.3°F) |
17.6 ° C (63.7°F) |
14.2 ° C (57.6°F) |
% 64 | 0% | 4 | Sunrise:05:31 AM Sunset: 08:07 PM |
Moonrise:07:45 AM Moonset: 11:53 PM Moon Phase ( Waxing Crescent ) |
|
| 20 May 2026 Wednesday | Sunny |
12.2 ° C (53.9°F) |
16 ° C (60.8°F) |
13.8 ° C (56.9°F) |
% 63 | 0% | 4 | Sunrise:05:30 AM Sunset: 08:08 PM |
Moonrise:09:00 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Partly Cloudy |
11.5 ° C (52.8°F) |
17.1 ° C (62.8°F) |
14.1 ° C (57.4°F) |
% 61 | 0% | 4 | Sunrise:05:30 AM Sunset: 08:09 PM |
Moonrise:10:18 AM Moonset: 12:36 AM Moon Phase ( Waxing Crescent ) |
|
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