Weather in Grand Detour, IL
Grand Detour, Sunday, 9 August, 11:13
Mostly clear. Feels like 89°. High 87°, low 64°.
0.28
Grand Detour, Monday, 10 August
Rain. High 90°, low 72°.
0.14Grand Detour, Tuesday, 11 August
Light rain. High 87°, low 65°.
0.01Grand Detour, Wednesday, 12 August
Light rain. High 84°, low 63°.
0.57Grand Detour, Thursday, 13 August
Rain. High 71°, low 62°.
0
Grand Detour, Friday, 14 August
Overcast. High 74°, low 58°.
0.16Grand Detour, Saturday, 15 August
Light rain. High 72°, low 60°.
0.3Grand Detour, Sunday, 16 August
Rain. High 74°, low 65°.
0Grand Detour, Monday, 17 August
Overcast. High 74°, low 58°.
0Grand Detour, Tuesday, 18 August
Overcast. High 78°, low 59°.
0
Grand Detour, Wednesday, 19 August
Partly cloudy. High 76°, low 62°.
0.02Grand Detour, Thursday, 20 August
Light rain. High 77°, low 59°.
1.93Grand Detour, Friday, 21 August
Heavy rain. High 81°, low 61°.
0.01Grand Detour, Saturday, 22 August
Light rain. High 79°, low 63°.
0
Grand Detour, Sunday, 23 August
Clear. High 76°, low 56°.
0Grand Detour, Monday, 24 August
Clear. High 78°, low 60°.
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 Grand Detour, 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 Grand Detour, 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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