Weather in Prospect Heights, IL
Prospect Heights, Sunday, 18 October, 21:44
Clear. Feels like 51°. High 64°, low 41°.
Monthly outlook for Prospect Heights, IL: average high 63.2°, average low 48.7°. That is 3.6° above the climate normal for October. Precipitation is expected on 5 days (about 1.4 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 30 October (69.9°), the coolest 1 November (40.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 65.4° | 57.8° | +4.2° |
| 28 October – 6 November | 59.6° | 54° | +3.1° |
| 7 November – 16 November | at normal | 48.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (8 mi).
0
Prospect Heights, Monday, 19 October
Clear. High 66°, low 44°.
0Prospect Heights, Tuesday, 20 October
Clear. High 68°, low 47°.
0Prospect Heights, Wednesday, 21 October
Clear. High 66°, low 45°.
0
Prospect Heights, Thursday, 22 October
Overcast. High 67°, low 49°.
0
Prospect Heights, Friday, 23 October
Partly cloudy. High 63°, low 49°.
0Prospect Heights, Saturday, 24 October
Overcast. High 68°, low 47°.
0.02
Prospect Heights, Sunday, 25 October
Light rain. High 67°, low 53°.
0.02Prospect Heights, Monday, 26 October
Light rain. High 63°, low 49°.
0.12Prospect Heights, Tuesday, 27 October
Light rain. High 61°, low 51°.
0.16Prospect Heights, Wednesday, 28 October
Light rain. High 55°, low 51°.
0.1Prospect Heights, Thursday, 29 October
Light rain. High 59°, low 54°.
0.14Prospect Heights, Friday, 30 October
Light rain. High 70°, low 60°.
0Prospect Heights, Saturday, 31 October
Overcast. High 62°, low 55°.
0.88Prospect Heights, Sunday, 1 November
Heavy rain. High 58°, low 40°.
0.01Prospect Heights, Monday, 2 November
Light rain. High 54°, low 43°.
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.
0.13
Prospect 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.
0.05Prospect Heights, Monday, 16 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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