Weather in Prospect Heights, IL
Prospect Heights, Saturday, 17 October, 19:42
Clear. Feels like 46°. High 57°, low 36°.
Monthly outlook for Prospect Heights, IL: average high 64.4°, average low 50°. That is 4° above the climate normal for October. Precipitation is expected on 4 days (about 2.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 25 October (74°), the coolest 17 October (35.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 65.9° | 58.2° | +4.3° |
| 27 October – 5 November | 61.9° | 54.4° | +4.2° |
| 6 November – 15 November | at normal | 49° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (8 mi).
0
Prospect Heights, Sunday, 18 October
Clear. High 63°, low 43°.
0
Prospect Heights, Monday, 19 October
Partly cloudy. High 63°, low 43°.
0Prospect Heights, Tuesday, 20 October
Partly cloudy. High 64°, low 45°.
0Prospect Heights, Wednesday, 21 October
Clear. High 66°, low 46°.
0Prospect Heights, Thursday, 22 October
Clear. High 64°, low 49°.
0
Prospect Heights, Friday, 23 October
Overcast. High 71°, low 53°.
0Prospect Heights, Saturday, 24 October
Overcast. High 71°, low 60°.
0Prospect Heights, Sunday, 25 October
Overcast. High 74°, low 62°.
0.43
Prospect Heights, Monday, 26 October
Rain. High 66°, low 54°.
0Prospect Heights, Tuesday, 27 October
Partly cloudy. High 53°, low 49°.
0Prospect Heights, Wednesday, 28 October
Overcast. High 57°, low 46°.
0.35Prospect Heights, Thursday, 29 October
Rain. High 58°, low 47°.
0.16Prospect Heights, Friday, 30 October
Light rain. High 67°, low 58°.
1.64Prospect Heights, Saturday, 31 October
Heavy rain. High 68°, low 56°.
0Prospect Heights, Sunday, 1 November
Partly cloudy. High 69°, low 53°.
0.12
Prospect Heights, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Prospect Heights, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Prospect Heights, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.13Prospect Heights, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Prospect Heights, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Saturday, 7 November
Climate normal for this date — 60-year average.
0.05
Prospect Heights, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Prospect Heights, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Prospect Heights, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Prospect Heights, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Prospect Heights, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Prospect Heights, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Prospect Heights, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Prospect Heights, Sunday, 15 November
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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