Weather in Blue Island, IL
Blue Island, Sunday, 9 August, 02:27
Clear. Feels like 65°. High 84°, low 64°.
Monthly outlook for Blue Island, IL: average high 84.4°, average low 68.6°. That is 2.6° above the climate normal for August. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 23 August (96.7°), the coolest 14 August (62.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.3° | 79.9° | +0.8° |
| 19 August – 28 August | 89.4° | 79.9° | +5.3° |
| 29 August – 7 September | at normal | 78.2° | — |
August records over 66 years
0.79
Blue Island, Monday, 10 August
Rain. High 90°, low 71°.
0.27Blue Island, Tuesday, 11 August
Rain. High 81°, low 69°.
0.02Blue Island, Wednesday, 12 August
Light rain. High 84°, low 71°.
0
Blue Island, Thursday, 13 August
Overcast. High 75°, low 67°.
0Blue Island, Friday, 14 August
Overcast. High 75°, low 63°.
0.02Blue Island, Saturday, 15 August
Light rain. High 80°, low 64°.
0.02Blue Island, Sunday, 16 August
Light rain. High 79°, low 66°.
0.01Blue Island, Monday, 17 August
Light rain. High 84°, low 67°.
0Blue Island, Tuesday, 18 August
Overcast. High 82°, low 67°.
0.1Blue Island, Wednesday, 19 August
Light rain. High 87°, low 68°.
0Blue Island, Thursday, 20 August
Overcast. High 88°, low 75°.
0
Blue Island, Friday, 21 August
Clear. High 87°, low 74°.
0Blue Island, Saturday, 22 August
Clear. High 95°, low 71°.
0.01Blue Island, Sunday, 23 August
Light rain. High 97°, low 71°.
0.27Blue Island, Monday, 24 August
Rain. High 83°, low 70°.
0.07
Blue Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Blue Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Blue Island, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15Blue Island, Friday, 28 August
Climate normal for this date — 60-year average.
0.1Blue Island, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Blue Island, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Blue Island, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Blue Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Blue Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Blue Island, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Blue Island, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Blue Island, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Blue Island, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Blue Island, Monday, 7 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 Blue Island, 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 Blue Island, 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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