Weather in Gretna, IL
Gretna, Monday, 26 October, 08:32
Overcast. Feels like 55°. High 63°, low 48°.
Monthly outlook for Gretna, IL: average high 60.9°, average low 48°. That is 4.2° above the climate normal for October. Precipitation is expected on 4 days (about 1.9 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 28 October (69.5°), the coolest 7 November (38.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 26 October – 4 November | 62.7° | 54.6° | +4.5° |
| 5 November – 14 November | 57.8° | 49.4° | +4.7° |
| 15 November – 24 November | at normal | 45.4° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Glendale Heights (2 mi).
0Gretna, Tuesday, 27 October
Overcast. High 68°, low 50°.
0
Gretna, Wednesday, 28 October
Clear. High 69°, low 54°.
0.02
Gretna, Thursday, 29 October
Light rain. High 69°, low 56°.
0Gretna, Friday, 30 October
Overcast. High 66°, low 46°.
0.67Gretna, Saturday, 31 October
Rain. High 65°, low 53°.
0.28Gretna, Sunday, 1 November
Light rain. High 57°, low 55°.
0.01Gretna, Monday, 2 November
Light rain. High 59°, low 55°.
0.77Gretna, Tuesday, 3 November
Rain. High 60°, low 45°.
0.13Gretna, Wednesday, 4 November
Light rain. High 52°, low 44°.
0Gretna, Thursday, 5 November
Overcast. High 62°, low 43°.
0.01Gretna, Friday, 6 November
Light rain. High 62°, low 45°.
0Gretna, Saturday, 7 November
Overcast. High 49°, low 38°.
0
Gretna, Sunday, 8 November
Mostly clear. High 55°, low 41°.
0Gretna, Monday, 9 November
Overcast. High 58°, low 45°.
0Gretna, Tuesday, 10 November
Overcast. High 60°, low 46°.
0.07
Gretna, 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.
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.
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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