Weather in Gretna, IL
Gretna, Thursday, 22 October, 17:26
Clear. Feels like 69°. High 71°, low 45°.
Monthly outlook for Gretna, IL: average high 59.8°, average low 47.4°. That is 2.6° above the climate normal for October. Precipitation is expected on 2 days (about 1.8 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 22 October (71.4°), the coolest 3 November (41.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 62.8° | 56.6° | +3.5° |
| 1 November – 10 November | 54.7° | 51.9° | +1.6° |
| 11 November – 20 November | at normal | 46.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0
Gretna, Friday, 23 October
Mostly clear. High 71°, low 46°.
0
Gretna, Saturday, 24 October
Overcast. High 66°, low 46°.
0Gretna, Sunday, 25 October
Mostly clear. High 69°, low 51°.
0Gretna, Monday, 26 October
Overcast. High 64°, low 51°.
0Gretna, Tuesday, 27 October
Overcast. High 61°, low 50°.
0
Gretna, Wednesday, 28 October
Partly cloudy. High 60°, low 50°.
0.37
Gretna, Thursday, 29 October
Rain. High 57°, low 51°.
1.45Gretna, Friday, 30 October
Heavy rain. High 54°, low 50°.
0Gretna, Saturday, 31 October
Partly cloudy. High 55°, low 46°.
0Gretna, Sunday, 1 November
Overcast. High 54°, low 48°.
0Gretna, Monday, 2 November
Overcast. High 54°, low 45°.
0Gretna, Tuesday, 3 November
Partly cloudy. High 55°, low 42°.
0Gretna, Wednesday, 4 November
Overcast. High 55°, low 45°.
0Gretna, Thursday, 5 November
Overcast. High 56°, low 44°.
0Gretna, Friday, 6 November
Overcast. High 54°, low 46°.
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.
0.07Gretna, Thursday, 19 November
Climate normal for this date — 60-year average.
0.08Gretna, Friday, 20 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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