Weather in Mount Prospect, IL
Mount Prospect, Saturday, 8 August, 18:57
Clear. Feels like 80°. High 83°, low 69°.
Monthly outlook for Mount Prospect, IL: average high 79.9°, average low 66.1°. That is 0.1° above the climate normal for August. Precipitation is expected on 5 days (about 2.2 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 12 August (86.2°), the coolest 23 August (58.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 81.4° | 79.9° | +0.8° |
| 18 August – 27 August | 77.4° | 79.7° | -1.3° |
| 28 August – 6 September | at normal | 78.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (6 mi).
1.19
Mount Prospect, Sunday, 9 August
Heavy rain. High 84°, low 65°.
0.15Mount Prospect, Monday, 10 August
Rain. High 86°, low 72°.
0.35Mount Prospect, Tuesday, 11 August
Rain. High 82°, low 71°.
0.01Mount Prospect, Wednesday, 12 August
Light rain. High 86°, low 68°.
0.07Mount Prospect, Thursday, 13 August
Light rain. High 74°, low 65°.
0Mount Prospect, Friday, 14 August
Clear. High 75°, low 62°.
0
Mount Prospect, Saturday, 15 August
Overcast. High 79°, low 61°.
0Mount Prospect, Sunday, 16 August
Overcast. High 81°, low 63°.
0.03Mount Prospect, Monday, 17 August
Light rain. High 84°, low 69°.
0.01Mount Prospect, Tuesday, 18 August
Light rain. High 82°, low 71°.
0.4Mount Prospect, Wednesday, 19 August
Rain. High 86°, low 69°.
0.01Mount Prospect, Thursday, 20 August
Light rain. High 77°, low 69°.
0
Mount Prospect, Friday, 21 August
Partly cloudy. High 79°, low 65°.
0.03Mount Prospect, Saturday, 22 August
Light rain. High 75°, low 61°.
0Mount Prospect, Sunday, 23 August
Clear. High 66°, low 58°.
0.12Mount Prospect, Monday, 24 August
Climate normal for this date — 60-year average.
0.06Mount Prospect, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15
Mount Prospect, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Mount Prospect, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13Mount Prospect, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Mount Prospect, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Mount Prospect, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Mount Prospect, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Mount Prospect, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.05Mount Prospect, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Mount Prospect, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Mount Prospect, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Mount Prospect, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Mount Prospect, 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 Mount Prospect, 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 Mount Prospect, 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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