Weather in Islip, NY
Islip, Saturday, 8 August, 17:09
Partly cloudy. Feels like 93°. High 87°, low 71°.
Monthly outlook for Islip, NY: average high 81.5°, average low 70.2°. That is 2.1° above the climate normal for August. Precipitation is expected on 6 days (about 2.1 inches), against a normal of 5 days and 2.3 inches. The warmest day looks like 11 August (91.8°), the coolest 23 August (63.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 84° | 78.3° | +3.2° |
| 18 August – 27 August | 77.3° | 76.9° | +0.3° |
| 28 August – 6 September | at normal | 75.8° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Farmingdale (13 mi).
0.01
Islip, Sunday, 9 August
Light rain. High 91°, low 74°.
0Islip, Monday, 10 August
Light rain. High 87°, low 73°.
0.02Islip, Tuesday, 11 August
Light rain. High 92°, low 78°.
0.28Islip, Wednesday, 12 August
Rain. High 82°, low 73°.
0.08Islip, Thursday, 13 August
Light rain. High 88°, low 71°.
0
Islip, Friday, 14 August
Overcast. High 79°, low 69°.
0
Islip, Saturday, 15 August
Clear. High 77°, low 65°.
0Islip, Sunday, 16 August
Partly cloudy. High 80°, low 66°.
0Islip, Monday, 17 August
Partly cloudy. High 78°, low 69°.
0.29Islip, Tuesday, 18 August
Light rain. High 79°, low 72°.
0.1Islip, Wednesday, 19 August
Light rain. High 82°, low 71°.
0.01Islip, Thursday, 20 August
Light rain. High 78°, low 70°.
0.83Islip, Friday, 21 August
Rain. High 75°, low 68°.
0.5Islip, Saturday, 22 August
Rain. High 79°, low 70°.
0Islip, Sunday, 23 August
Partly cloudy. High 71°, low 63°.
0.08Islip, Monday, 24 August
Climate normal for this date — 60-year average.
0.09Islip, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.07Islip, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13
Islip, Thursday, 27 August
Climate normal for this date — 60-year average.
0.19Islip, Friday, 28 August
Climate normal for this date — 60-year average.
0.14Islip, Saturday, 29 August
Climate normal for this date — 60-year average.
0.08Islip, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05Islip, Monday, 31 August
Climate normal for this date — 60-year average.
0.07Islip, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.15Islip, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Islip, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Islip, Friday, 4 September
Climate normal for this date — 60-year average.
0.05
Islip, Saturday, 5 September
Climate normal for this date — 60-year average.
0.17Islip, Sunday, 6 September
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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