Weather in Islip, NY
Islip, Friday, 9 October, 08:03
Clear. Feels like 54°. High 71°, low 49°.
Monthly outlook for Islip, NY: average high 63.6°, average low 53.1°. That is 1° above the climate normal for October. Precipitation is expected on 5 days (about 2.3 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 9 October (71.2°), the coolest 9 October (48.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 65.2° | 62.8° | +1.4° |
| 19 October – 28 October | 60.8° | 59.7° | +0.6° |
| 29 October – 7 November | at normal | 56.8° | — |
October records over 66 years
0
Islip, Saturday, 10 October
Overcast. High 69°, low 50°.
0.5
Islip, Sunday, 11 October
Rain. High 63°, low 55°.
1.2Islip, Monday, 12 October
Heavy rain. High 68°, low 60°.
0Islip, Tuesday, 13 October
Clear. High 70°, low 55°.
0.22Islip, Wednesday, 14 October
Rain. High 65°, low 56°.
0Islip, Thursday, 15 October
Clear. High 61°, low 51°.
0Islip, Friday, 16 October
Overcast. High 65°, low 59°.
0.04Islip, Saturday, 17 October
Light rain. High 66°, low 59°.
0.39Islip, Sunday, 18 October
Rain. High 55°, low 50°.
0Islip, Monday, 19 October
Overcast. High 56°, low 49°.
0Islip, Tuesday, 20 October
Overcast. High 58°, low 49°.
0Islip, Wednesday, 21 October
Overcast. High 61°, low 51°.
0Islip, Thursday, 22 October
Overcast. High 62°, low 52°.
0Islip, Friday, 23 October
Overcast. High 63°, low 53°.
0Islip, Saturday, 24 October
Clear. High 64°, low 52°.
0.15
Islip, Sunday, 25 October
Climate normal for this date — 60-year average.
0.16Islip, Monday, 26 October
Climate normal for this date — 60-year average.
0.16
Islip, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.17Islip, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.2Islip, Thursday, 29 October
Climate normal for this date — 60-year average.
0.11Islip, Friday, 30 October
Climate normal for this date — 60-year average.
0.05Islip, Saturday, 31 October
Climate normal for this date — 60-year average.
0.13Islip, Sunday, 1 November
Climate normal for this date — 60-year average.
0.07Islip, Monday, 2 November
Climate normal for this date — 60-year average.
0.11Islip, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.06Islip, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.14Islip, Thursday, 5 November
Climate normal for this date — 60-year average.
0.11Islip, Friday, 6 November
Climate normal for this date — 60-year average.
0.1Islip, Saturday, 7 November
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 Islip, 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 Islip, 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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