Weather in Prospect Heights, IL
Prospect Heights, Saturday, 8 August, 18:10
Clear. Feels like 83°. High 82°, low 69°.
Monthly outlook for Prospect Heights, IL: average high 79.6°, average low 66°. That is 0.1° below the climate normal for August. Precipitation is expected on 6 days (about 2.3 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 12 August (86°), the coolest 23 August (58°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 81.1° | 79.9° | +0.6° |
| 18 August – 27 August | 77.2° | 79.7° | -1.4° |
| 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 (8 mi).
1.17
Prospect Heights, Sunday, 9 August
Heavy rain. High 84°, low 65°.
0.16Prospect Heights, Monday, 10 August
Rain. High 85°, low 72°.
0.39Prospect Heights, Tuesday, 11 August
Rain. High 81°, low 71°.
0.01Prospect Heights, Wednesday, 12 August
Light rain. High 86°, low 68°.
0.07Prospect Heights, Thursday, 13 August
Light rain. High 73°, low 65°.
0Prospect Heights, Friday, 14 August
Clear. High 75°, low 62°.
0
Prospect Heights, Saturday, 15 August
Overcast. High 79°, low 60°.
0Prospect Heights, Sunday, 16 August
Overcast. High 81°, low 63°.
0.03Prospect Heights, Monday, 17 August
Light rain. High 84°, low 69°.
0.01Prospect Heights, Tuesday, 18 August
Light rain. High 82°, low 71°.
0.4Prospect Heights, Wednesday, 19 August
Rain. High 85°, low 69°.
0.01Prospect Heights, Thursday, 20 August
Light rain. High 77°, low 69°.
0
Prospect Heights, Friday, 21 August
Partly cloudy. High 78°, low 65°.
0.04Prospect Heights, Saturday, 22 August
Light rain. High 75°, low 61°.
0Prospect Heights, Sunday, 23 August
Clear. High 66°, low 58°.
0.12Prospect Heights, Monday, 24 August
Climate normal for this date — 60-year average.
0.06Prospect Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15
Prospect Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Prospect Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13Prospect Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Prospect Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Prospect Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Prospect Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Prospect Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.05Prospect Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Prospect Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Prospect Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Prospect Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Prospect Heights, 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 Prospect Heights, 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 Prospect Heights, 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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