Weather in Joliet, IL
Joliet, Saturday, 8 August, 21:22
Clear. Feels like 72°. High 83°, low 69°.
Monthly outlook for Joliet, IL: average high 77.2°, average low 62.6°. That is 2° below the climate normal for August. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 9 August (88.9°), the coolest 21 August (52.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 79° | 81° | -1.1° |
| 18 August – 27 August | 74.2° | 81° | -3.7° |
| 28 August – 6 September | at normal | 79.5° | — |
August records over 66 years
0.07
Joliet, Sunday, 9 August
Rain. High 89°, low 64°.
0.14Joliet, Monday, 10 August
Light rain. High 88°, low 72°.
0.09Joliet, Tuesday, 11 August
Light rain. High 83°, low 73°.
0.02Joliet, Wednesday, 12 August
Light rain. High 81°, low 67°.
0.01Joliet, Thursday, 13 August
Light rain. High 73°, low 63°.
0
Joliet, Friday, 14 August
Clear. High 78°, low 60°.
0.02Joliet, Saturday, 15 August
Light rain. High 65°, low 60°.
0
Joliet, Sunday, 16 August
Overcast. High 72°, low 62°.
0Joliet, Monday, 17 August
Overcast. High 77°, low 64°.
0Joliet, Tuesday, 18 August
Overcast. High 81°, low 65°.
0.05Joliet, Wednesday, 19 August
Light rain. High 72°, low 59°.
0.01Joliet, Thursday, 20 August
Light rain. High 64°, low 53°.
0
Joliet, Friday, 21 August
Partly cloudy. High 74°, low 53°.
0Joliet, Saturday, 22 August
Overcast. High 73°, low 55°.
0Joliet, Sunday, 23 August
Clear. High 80°, low 64°.
0.12Joliet, Monday, 24 August
Climate normal for this date — 60-year average.
0.11Joliet, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Joliet, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Joliet, Thursday, 27 August
Climate normal for this date — 60-year average.
0.11Joliet, Friday, 28 August
Climate normal for this date — 60-year average.
0.12Joliet, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Joliet, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Joliet, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Joliet, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Joliet, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Joliet, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Joliet, Friday, 4 September
Climate normal for this date — 60-year average.
0.06
Joliet, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Joliet, Sunday, 6 September
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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