Weather in Gretna, IL
Gretna, Saturday, 8 August, 20:41
Clear. Feels like 73°. High 83°, low 68°.
Monthly outlook for Gretna, IL: average high 78.5°, average low 64°. That is 0.8° below the climate normal for August. Precipitation is expected on 3 days (about 1.3 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 9 August (87.7°), the coolest 21 August (55.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 80.4° | 80.1° | +0.2° |
| 18 August – 27 August | 75.2° | 79.9° | -2.6° |
| 28 August – 6 September | at normal | 78.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0.59
Gretna, Sunday, 9 August
Rain. High 88°, low 64°.
0.57Gretna, Monday, 10 August
Heavy rain. High 88°, low 71°.
0.1Gretna, Tuesday, 11 August
Rain. High 84°, low 71°.
0.01Gretna, Wednesday, 12 August
Light rain. High 81°, low 68°.
0
Gretna, Thursday, 13 August
Overcast. High 75°, low 64°.
0
Gretna, Friday, 14 August
Clear. High 79°, low 62°.
0Gretna, Saturday, 15 August
Overcast. High 71°, low 64°.
0Gretna, Sunday, 16 August
Overcast. High 77°, low 64°.
0
Gretna, Monday, 17 August
Partly cloudy. High 80°, low 65°.
0Gretna, Tuesday, 18 August
Overcast. High 82°, low 67°.
0.01Gretna, Wednesday, 19 August
Light rain. High 75°, low 63°.
0Gretna, Thursday, 20 August
Overcast. High 68°, low 56°.
0Gretna, Friday, 21 August
Clear. High 76°, low 55°.
0.01Gretna, Saturday, 22 August
Light rain. High 70°, low 59°.
0Gretna, Sunday, 23 August
Clear. High 81°, low 64°.
0.13Gretna, Monday, 24 August
Climate normal for this date — 60-year average.
0.07Gretna, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15Gretna, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Gretna, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13
Gretna, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Gretna, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Gretna, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08
Gretna, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Gretna, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Gretna, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Gretna, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Gretna, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Gretna, Saturday, 5 September
Climate normal for this date — 60-year average.
0.11Gretna, 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 Gretna, 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 Gretna, 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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