Weather in Lake Zurich, IL
Lake Zurich, Sunday, 9 August, 09:49
Clear. Feels like 76°. High 85°, low 62°.
Monthly outlook for Lake Zurich, IL: average high 78.9°, average low 62.2°. That is 0.7° above the climate normal for August. Precipitation is expected on 8 days (about 3.3 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 10 August (90.1°), the coolest 23 August (55.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 79.8° | 77.9° | +1° |
| 19 August – 28 August | 77.6° | 77.8° | -0.1° |
| 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 (14 mi).
0.63
Lake Zurich, Monday, 10 August
Heavy rain. High 90°, low 72°.
1.25Lake Zurich, Tuesday, 11 August
Heavy rain. High 85°, low 65°.
0Lake Zurich, Wednesday, 12 August
Clear. High 84°, low 63°.
0.06Lake Zurich, Thursday, 13 August
Light rain. High 74°, low 62°.
0
Lake Zurich, Friday, 14 August
Overcast. High 73°, low 60°.
0.07Lake Zurich, Saturday, 15 August
Light rain. High 76°, low 62°.
0.2Lake Zurich, Sunday, 16 August
Light rain. High 75°, low 64°.
0Lake Zurich, Monday, 17 August
Overcast. High 77°, low 63°.
0Lake Zurich, Tuesday, 18 August
Overcast. High 79°, low 60°.
0.01Lake Zurich, Wednesday, 19 August
Light rain. High 75°, low 63°.
0.07Lake Zurich, Thursday, 20 August
Light rain. High 76°, low 60°.
0.11Lake Zurich, Friday, 21 August
Light rain. High 78°, low 61°.
0.02Lake Zurich, Saturday, 22 August
Light rain. High 80°, low 64°.
0Lake Zurich, Sunday, 23 August
Clear. High 77°, low 55°.
0Lake Zurich, Monday, 24 August
Clear. High 79°, low 60°.
0.07
Lake Zurich, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Lake Zurich, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.1Lake Zurich, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12Lake Zurich, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Lake Zurich, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Lake Zurich, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Lake Zurich, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Lake Zurich, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Lake Zurich, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Lake Zurich, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Lake Zurich, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Lake Zurich, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Lake Zurich, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Lake Zurich, 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 Lake Zurich, 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 Lake Zurich, 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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