Weather in Joliet, IL
Joliet, Tuesday, 20 October, 01:46
Partly cloudy. Feels like 47°. High 69°, low 43°.
Monthly outlook for Joliet, IL: average high 58.8°, average low 42°. That is 0.7° above the climate normal for October. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 21 October (70.3°), the coolest 28 October (27.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 60° | 58.6° | +0.8° |
| 30 October – 8 November | 56.7° | 54.5° | +1.2° |
| 9 November – 18 November | at normal | 49° | — |
October records over 66 years
0
Joliet, Wednesday, 21 October
Clear. High 70°, low 43°.
0
Joliet, Thursday, 22 October
Light rain. High 69°, low 48°.
0
Joliet, Friday, 23 October
Mostly clear. High 63°, low 44°.
0Joliet, Saturday, 24 October
Mostly clear. High 63°, low 44°.
0.02Joliet, Sunday, 25 October
Light rain. High 67°, low 46°.
0
Joliet, Monday, 26 October
Overcast. High 60°, low 53°.
0.31Joliet, Tuesday, 27 October
Rain. High 51°, low 35°.
0Joliet, Wednesday, 28 October
Clear. High 40°, low 28°.
0Joliet, Thursday, 29 October
Mostly clear. High 48°, low 29°.
0Joliet, Friday, 30 October
Clear. High 55°, low 34°.
0Joliet, Saturday, 31 October
Overcast. High 61°, low 42°.
0.06Joliet, Sunday, 1 November
Light rain. High 59°, low 48°.
0.26Joliet, Monday, 2 November
Light rain. High 55°, low 50°.
0
Joliet, Tuesday, 3 November
Partly cloudy. High 56°, low 44°.
0Joliet, Wednesday, 4 November
Mostly clear. High 54°, low 40°.
0.11Joliet, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Joliet, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Joliet, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Joliet, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13
Joliet, Monday, 9 November
Climate normal for this date — 60-year average.
0.13Joliet, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Joliet, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.07Joliet, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Joliet, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Joliet, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Joliet, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Joliet, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Joliet, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.15Joliet, Wednesday, 18 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 Joliet, 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 Joliet, 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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