Weather in Port Jefferson, NY
Port Jefferson, Saturday, 14 November, 04:02
Overcast. Feels like 33°. High 45°, low 37°.
Monthly outlook for Port Jefferson, NY: average high 51°, average low 44.1°. That is 0.8° above the climate normal for November. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 20 November (58°), the coolest 14 November (37.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 14 November – 23 November | 51.9° | 49.8° | +1.1° |
| 24 November – 3 December | 49.5° | 48° | +0.8° |
| 4 December – 13 December | at normal | 43.8° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Stony Brook University (4 mi).
0
Port Jefferson, Sunday, 15 November
Partly cloudy. High 46°, low 40°.
0
Port Jefferson, Monday, 16 November
Mostly clear. High 49°, low 42°.
0
Port Jefferson, Tuesday, 17 November
Clear. High 52°, low 42°.
0Port Jefferson, Wednesday, 18 November
Mostly clear. High 55°, low 46°.
0Port Jefferson, Thursday, 19 November
Partly cloudy. High 56°, low 47°.
0Port Jefferson, Friday, 20 November
Clear. High 58°, low 53°.
0Port Jefferson, Saturday, 21 November
Mostly clear. High 49°, low 44°.
0Port Jefferson, Sunday, 22 November
Partly cloudy. High 50°, low 44°.
0.11
Port Jefferson, Monday, 23 November
Light rain. High 58°, low 51°.
0Port Jefferson, Tuesday, 24 November
Clear. High 54°, low 45°.
0Port Jefferson, Wednesday, 25 November
Clear. High 49°, low 43°.
0.01Port Jefferson, Thursday, 26 November
Light rain. High 52°, low 45°.
0Port Jefferson, Friday, 27 November
Clear. High 48°, low 40°.
0Port Jefferson, Saturday, 28 November
Overcast. High 46°, low 43°.
0.08Port Jefferson, Sunday, 29 November
Light rain. High 47°, low 45°.
0.15
Port Jefferson, Monday, 30 November
Climate normal for this date — 60-year average.
0.14Port Jefferson, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.14Port Jefferson, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.15Port Jefferson, Thursday, 3 December
Climate normal for this date — 60-year average.
0.12Port Jefferson, Friday, 4 December
Climate normal for this date — 60-year average.
0.17Port Jefferson, Saturday, 5 December
Climate normal for this date — 60-year average.
0.18Port Jefferson, Sunday, 6 December
Climate normal for this date — 60-year average.
0.15Port Jefferson, Monday, 7 December
Climate normal for this date — 60-year average.
0.11Port Jefferson, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.24Port Jefferson, Wednesday, 9 December
Climate normal for this date — 60-year average.
0.13Port Jefferson, Thursday, 10 December
Climate normal for this date — 60-year average.
0.26Port Jefferson, Friday, 11 December
Climate normal for this date — 60-year average.
0.16Port Jefferson, Saturday, 12 December
Climate normal for this date — 60-year average.
0.11Port Jefferson, Sunday, 13 December
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Port Jefferson, NY are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Port Jefferson, NY since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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