Weather in Joliet, IL
Joliet, Tuesday, 20 October, 11:05
Clear. Feels like 62°. High 68°, low 42°.
Monthly outlook for Joliet, IL: average high 59.1°, average low 41.7°. That is 0.9° above the climate normal for October. Precipitation is expected on 3 days (about 0.8 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 21 October (71.1°), the coolest 31 October (30.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 62.5° | 58.6° | +2.2° |
| 30 October – 8 November | 53.4° | 54.5° | -0.6° |
| 9 November – 18 November | at normal | 49° | — |
October records over 66 years
0Joliet, Wednesday, 21 October
Clear. High 71°, low 42°.
0Joliet, Thursday, 22 October
Clear. High 69°, low 47°.
0Joliet, Friday, 23 October
Clear. High 66°, low 48°.
0
Joliet, Saturday, 24 October
Overcast. High 68°, low 47°.
0
Joliet, Sunday, 25 October
Partly cloudy. High 71°, low 52°.
0.06
Joliet, Monday, 26 October
Light rain. High 69°, low 44°.
0.09Joliet, Tuesday, 27 October
Light rain. High 47°, low 37°.
0Joliet, Wednesday, 28 October
Clear. High 47°, low 31°.
0Joliet, Thursday, 29 October
Clear. High 51°, low 37°.
0Joliet, Friday, 30 October
Clear. High 44°, low 33°.
0Joliet, Saturday, 31 October
Partly cloudy. High 49°, low 31°.
0Joliet, Sunday, 1 November
Overcast. High 50°, low 40°.
0Joliet, Monday, 2 November
Clear. High 60°, low 42°.
0Joliet, Tuesday, 3 November
Overcast. High 61°, low 44°.
0.66Joliet, Wednesday, 4 November
Rain. High 57°, low 51°.
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.
0.06
Joliet, 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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