Weather in Gretna, IL
Gretna, Thursday, 29 October, 04:29
Overcast. Feels like 61°. High 69°, low 53°.
Monthly outlook for Gretna, IL: average high 55.5°, average low 46.9°. That is 2.2° above the climate normal for October. Precipitation is expected on 7 days (about 4.6 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 29 October (69°), the coolest 11 November (37°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 60.8° | 53.5° | +4.1° |
| 8 November – 17 November | 46.7° | 47.9° | -0.6° |
| 18 November – 27 November | at normal | 44.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0.02
Gretna, Friday, 30 October
Light rain. High 63°, low 49°.
1.22Gretna, Saturday, 31 October
Heavy rain. High 54°, low 50°.
0Gretna, Sunday, 1 November
Overcast. High 64°, low 47°.
0.09Gretna, Monday, 2 November
Light rain. High 61°, low 55°.
1.68Gretna, Tuesday, 3 November
Heavy rain. High 63°, low 59°.
0.41Gretna, Wednesday, 4 November
Rain. High 62°, low 61°.
0.45Gretna, Thursday, 5 November
Rain. High 65°, low 58°.
0.04Gretna, Friday, 6 November
Light rain. High 57°, low 44°.
0Gretna, Saturday, 7 November
Overcast. High 51°, low 42°.
0Gretna, Sunday, 8 November
Overcast. High 52°, low 41°.
0.22Gretna, Monday, 9 November
Rain. High 49°, low 41°.
0.43Gretna, Tuesday, 10 November
Rain. High 45°, low 39°.
0.03Gretna, Wednesday, 11 November
Light rain. High 46°, low 37°.
0Gretna, Thursday, 12 November
Light rain. High 44°, low 38°.
0
Gretna, Friday, 13 November
Mostly clear. High 45°, low 37°.
0.07
Gretna, 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.
0.1Gretna, Saturday, 21 November
Climate normal for this date — 60-year average.
0.04Gretna, Sunday, 22 November
Climate normal for this date — 60-year average.
0.07Gretna, Monday, 23 November
Climate normal for this date — 60-year average.
0.07Gretna, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.08
Gretna, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.11Gretna, Thursday, 26 November
Climate normal for this date — 60-year average.
0.2Gretna, Friday, 27 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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