Weather in Sleepy Hollow, IL
Sleepy Hollow, Sunday, 9 August, 08:05
Clear. Feels like 71°. High 86°, low 62°.
Monthly outlook for Sleepy Hollow, IL: average high 77.3°, average low 61.1°. That is 1.3° below the climate normal for August. Precipitation is expected on 8 days (about 3.2 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 10 August (89.5°), the coolest 23 August (53.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 78.3° | 79.8° | -0.8° |
| 19 August – 28 August | 75.7° | 79.9° | -2.3° |
| 29 August – 7 September | at normal | 78.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Elgin (4 mi).
0.6
Sleepy Hollow, Monday, 10 August
Heavy rain. High 89°, low 71°.
0.87Sleepy Hollow, Tuesday, 11 August
Heavy rain. High 82°, low 65°.
0Sleepy Hollow, Wednesday, 12 August
Light rain. High 83°, low 62°.
0.1Sleepy Hollow, Thursday, 13 August
Light rain. High 73°, low 62°.
0Sleepy Hollow, Friday, 14 August
Light rain. High 72°, low 58°.
0.04Sleepy Hollow, Saturday, 15 August
Light rain. High 74°, low 61°.
0.26Sleepy Hollow, Sunday, 16 August
Rain. High 74°, low 64°.
0
Sleepy Hollow, Monday, 17 August
Overcast. High 75°, low 61°.
0Sleepy Hollow, Tuesday, 18 August
Overcast. High 77°, low 58°.
0.01Sleepy Hollow, Wednesday, 19 August
Light rain. High 73°, low 61°.
0.22Sleepy Hollow, Thursday, 20 August
Light rain. High 72°, low 58°.
0.29Sleepy Hollow, Friday, 21 August
Rain. High 78°, low 59°.
0.02Sleepy Hollow, Saturday, 22 August
Light rain. High 79°, low 62°.
0Sleepy Hollow, Sunday, 23 August
Clear. High 75°, low 54°.
0Sleepy Hollow, Monday, 24 August
Clear. High 77°, low 58°.
0.08
Sleepy Hollow, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.16
Sleepy Hollow, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Sleepy Hollow, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13Sleepy Hollow, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Sleepy Hollow, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Sleepy Hollow, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09Sleepy Hollow, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Sleepy Hollow, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Sleepy Hollow, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Sleepy Hollow, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Sleepy Hollow, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Sleepy Hollow, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Sleepy Hollow, Sunday, 6 September
Climate normal for this date — 60-year average.
0.09Sleepy Hollow, 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 Sleepy Hollow, IL 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 Sleepy Hollow, IL 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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