Weather in Islip, NY
Islip, Friday, 9 October, 03:38
Clear. Feels like 54°. High 72°, low 52°.
Monthly outlook for Islip, NY: average high 65.3°, average low 54.7°. That is 1.9° above the climate normal for October. Precipitation is expected on 5 days (about 0.6 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 13 October (72.4°), the coolest 18 October (47.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 67° | 62.8° | +2.4° |
| 19 October – 28 October | 62.4° | 59.7° | +1.5° |
| 29 October – 7 November | at normal | 56.8° | — |
October records over 66 years
0
Islip, Saturday, 10 October
Partly cloudy. High 71°, low 50°.
0.32
Islip, Sunday, 11 October
Rain. High 64°, low 55°.
0.09Islip, Monday, 12 October
Rain. High 67°, low 59°.
0.04Islip, Tuesday, 13 October
Light rain. High 72°, low 55°.
0
Islip, Wednesday, 14 October
Mostly clear. High 66°, low 57°.
0Islip, Thursday, 15 October
Mostly clear. High 64°, low 54°.
0Islip, Friday, 16 October
Partly cloudy. High 67°, low 60°.
0.05Islip, Saturday, 17 October
Light rain. High 71°, low 58°.
0
Islip, Sunday, 18 October
Clear. High 56°, low 47°.
0
Islip, Monday, 19 October
Overcast. High 60°, low 52°.
0Islip, Tuesday, 20 October
Overcast. High 59°, low 51°.
0Islip, Wednesday, 21 October
Overcast. High 65°, low 56°.
0Islip, Thursday, 22 October
Overcast. High 68°, low 59°.
0.04Islip, Friday, 23 October
Light rain. High 65°, low 58°.
0.02Islip, Saturday, 24 October
Light rain. High 57°, low 54°.
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.
0.16Islip, 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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