Weather in Mount Sinai, NY
Mount Sinai, Sunday, 9 August, 00:35
Mostly clear. Feels like 78°. High 90°, low 74°.
Monthly outlook for Mount Sinai, NY: average high 79.8°, average low 69.6°. That is 0.6° above the climate normal for August. Precipitation is expected on 4 days (about 1.5 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 9 August (90.4°), the coolest 14 August (64.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81° | 79.6° | +0.8° |
| 19 August – 28 August | 77.8° | 77.9° | -0.1° |
| 29 August – 7 September | at normal | 76.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Stony Brook University (6 mi).
0.04
Mount Sinai, Monday, 10 August
Light rain. High 89°, low 72°.
0
Mount Sinai, Tuesday, 11 August
Overcast. High 85°, low 75°.
0.16Mount Sinai, Wednesday, 12 August
Light rain. High 78°, low 71°.
0.17Mount Sinai, Thursday, 13 August
Light rain. High 82°, low 70°.
0
Mount Sinai, Friday, 14 August
Clear. High 77°, low 65°.
0Mount Sinai, Saturday, 15 August
Clear. High 78°, low 67°.
0
Mount Sinai, Sunday, 16 August
Partly cloudy. High 76°, low 66°.
0Mount Sinai, Monday, 17 August
Overcast. High 78°, low 71°.
0.06Mount Sinai, Tuesday, 18 August
Light rain. High 76°, low 67°.
0Mount Sinai, Wednesday, 19 August
Light rain. High 78°, low 70°.
1Mount Sinai, Thursday, 20 August
Heavy rain. High 79°, low 68°.
0Mount Sinai, Friday, 21 August
Overcast. High 76°, low 66°.
0Mount Sinai, Saturday, 22 August
Clear. High 76°, low 65°.
0.01Mount Sinai, Sunday, 23 August
Light rain. High 77°, low 71°.
0Mount Sinai, Monday, 24 August
Clear. High 81°, low 75°.
0.09Mount Sinai, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.09Mount Sinai, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Mount Sinai, Thursday, 27 August
Climate normal for this date — 60-year average.
0.18
Mount Sinai, Friday, 28 August
Climate normal for this date — 60-year average.
0.16Mount Sinai, Saturday, 29 August
Climate normal for this date — 60-year average.
0.08Mount Sinai, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05
Mount Sinai, Monday, 31 August
Climate normal for this date — 60-year average.
0.07Mount Sinai, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.19Mount Sinai, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Mount Sinai, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Mount Sinai, Friday, 4 September
Climate normal for this date — 60-year average.
0.05Mount Sinai, Saturday, 5 September
Climate normal for this date — 60-year average.
0.14Mount Sinai, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Mount Sinai, Monday, 7 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 Mount Sinai, 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 Mount Sinai, 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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