Weather in Gretna, IL
Gretna, Tuesday, 20 October, 15:09
Clear. Feels like 68°. High 70°, low 41°.
Monthly outlook for Gretna, IL: average high 57.9°, average low 42°. That is 1° above the climate normal for October. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 21 October (70.6°), the coolest 28 October (31.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 61.3° | 57.2° | +2.3° |
| 30 October – 8 November | 52.1° | 53.1° | -0.6° |
| 9 November – 18 November | at normal | 47.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0Gretna, Wednesday, 21 October
Clear. High 71°, low 43°.
0
Gretna, Thursday, 22 October
Mostly clear. High 68°, low 47°.
0Gretna, Friday, 23 October
Clear. High 64°, low 48°.
0
Gretna, Saturday, 24 October
Partly cloudy. High 66°, low 47°.
0
Gretna, Sunday, 25 October
Overcast. High 68°, low 53°.
0.15
Gretna, Monday, 26 October
Rain. High 67°, low 43°.
0.08Gretna, Tuesday, 27 October
Light rain. High 46°, low 38°.
0Gretna, Wednesday, 28 October
Clear. High 46°, low 32°.
0Gretna, Thursday, 29 October
Clear. High 49°, low 37°.
0Gretna, Friday, 30 October
Clear. High 43°, low 33°.
0Gretna, Saturday, 31 October
Overcast. High 48°, low 32°.
0Gretna, Sunday, 1 November
Overcast. High 49°, low 41°.
0Gretna, Monday, 2 November
Clear. High 58°, low 41°.
0Gretna, Tuesday, 3 November
Overcast. High 59°, low 45°.
0.48Gretna, Wednesday, 4 November
Rain. High 55°, low 51°.
0.11Gretna, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Gretna, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Gretna, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Gretna, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Gretna, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Gretna, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Gretna, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Gretna, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Gretna, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Gretna, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Gretna, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Gretna, Monday, 16 November
Climate normal for this date — 60-year average.
0.08Gretna, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.11Gretna, 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 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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