Weather in Sylvan Lake, IL
Sylvan Lake, Sunday, 9 August, 03:21
Clear. Feels like 63°. High 80°, low 63°.
Monthly outlook for Sylvan Lake, IL: average high 81.9°, average low 65.7°. That is 2.3° above the climate normal for August. Precipitation is expected on 5 days (about 2.4 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 22 August (93.3°), the coolest 14 August (57.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 78.8° | 77.9° | +0.5° |
| 19 August – 28 August | 87.1° | 77.8° | +5.2° |
| 29 August – 7 September | at normal | 76.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (13 mi).
0.56
Sylvan Lake, Monday, 10 August
Rain. High 88°, low 69°.
0.43Sylvan Lake, Tuesday, 11 August
Heavy rain. High 82°, low 67°.
0.03Sylvan Lake, Wednesday, 12 August
Light rain. High 83°, low 68°.
0
Sylvan Lake, Thursday, 13 August
Overcast. High 74°, low 63°.
0
Sylvan Lake, Friday, 14 August
Mostly clear. High 74°, low 58°.
0Sylvan Lake, Saturday, 15 August
Overcast. High 77°, low 59°.
0.02Sylvan Lake, Sunday, 16 August
Light rain. High 72°, low 65°.
0.04Sylvan Lake, Monday, 17 August
Light rain. High 80°, low 64°.
0Sylvan Lake, Tuesday, 18 August
Overcast. High 78°, low 62°.
0.2Sylvan Lake, Wednesday, 19 August
Light rain. High 85°, low 68°.
0Sylvan Lake, Thursday, 20 August
Overcast. High 92°, low 74°.
0
Sylvan Lake, Friday, 21 August
Clear. High 83°, low 70°.
0.01Sylvan Lake, Saturday, 22 August
Light rain. High 93°, low 67°.
0Sylvan Lake, Sunday, 23 August
Overcast. High 91°, low 68°.
0.03Sylvan Lake, Monday, 24 August
Light rain. High 78°, low 68°.
0.07
Sylvan Lake, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Sylvan Lake, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.1Sylvan Lake, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12Sylvan Lake, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Sylvan Lake, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Sylvan Lake, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Sylvan Lake, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Sylvan Lake, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Sylvan Lake, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Sylvan Lake, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Sylvan Lake, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Sylvan Lake, 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 Sylvan Lake, 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 Sylvan Lake, 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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