Weather in Harvey, IL
Harvey, Sunday, 11 October, 16:10
Clear. Feels like 78°. High 78°, low 54°.
Monthly outlook for Harvey, IL: average high 65.3°, average low 53°. That is 3° above the climate normal for October. Precipitation is expected on 4 days (about 3.5 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (85.1°), the coolest 18 October (37.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 66.9° | 61° | +3.3° |
| 21 October – 30 October | 62.7° | 57.3° | +3° |
| 31 October – 9 November | at normal | 53.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Blue Island (4 mi).
0Harvey, Monday, 12 October
Clear. High 85°, low 64°.
0Harvey, Tuesday, 13 October
Clear. High 81°, low 67°.
0.52
Harvey, Wednesday, 14 October
Heavy rain. High 68°, low 60°.
1.37Harvey, Thursday, 15 October
Rain. High 62°, low 57°.
0
Harvey, Friday, 16 October
Partly cloudy. High 58°, low 48°.
0Harvey, Saturday, 17 October
Clear. High 50°, low 39°.
0Harvey, Sunday, 18 October
Clear. High 57°, low 38°.
0Harvey, Monday, 19 October
Clear. High 65°, low 45°.
0
Harvey, Tuesday, 20 October
Overcast. High 64°, low 52°.
0Harvey, Wednesday, 21 October
Overcast. High 67°, low 57°.
0.03Harvey, Thursday, 22 October
Light rain. High 73°, low 63°.
0.56Harvey, Friday, 23 October
Rain. High 65°, low 61°.
1.06Harvey, Saturday, 24 October
Rain. High 62°, low 52°.
0Harvey, Sunday, 25 October
Overcast. High 54°, low 49°.
0Harvey, Monday, 26 October
Overcast. High 55°, low 42°.
0.09
Harvey, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Harvey, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Harvey, Thursday, 29 October
Climate normal for this date — 60-year average.
0.12Harvey, Friday, 30 October
Climate normal for this date — 60-year average.
0.15Harvey, Saturday, 31 October
Climate normal for this date — 60-year average.
0.18Harvey, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Harvey, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Harvey, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Harvey, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.13Harvey, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Harvey, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Harvey, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Harvey, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13Harvey, Monday, 9 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 Harvey, 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 Harvey, 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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