Weather in Collinsville, IL
Collinsville, Monday, 19 October, 12:17
Clear. Feels like 66°. High 69°, low 40°.
Monthly outlook for Collinsville, IL: average high 62.9°, average low 45.3°. That is 0.3° above the climate normal for October. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 25 October (77.1°), the coolest 29 October (32.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 68.3° | 63.4° | +2.8° |
| 29 October – 7 November | 53.9° | 59.4° | -3.1° |
| 8 November – 17 November | at normal | 54.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Edwardsville (8 mi).
0Collinsville, Tuesday, 20 October
Clear. High 72°, low 43°.
0
Collinsville, Wednesday, 21 October
Overcast. High 68°, low 46°.
0Collinsville, Thursday, 22 October
Clear. High 71°, low 51°.
0Collinsville, Friday, 23 October
Clear. High 69°, low 50°.
0Collinsville, Saturday, 24 October
Overcast. High 68°, low 49°.
0Collinsville, Sunday, 25 October
Overcast. High 77°, low 56°.
0Collinsville, Monday, 26 October
Overcast. High 75°, low 61°.
0.13
Collinsville, Tuesday, 27 October
Light rain. High 66°, low 47°.
0Collinsville, Wednesday, 28 October
Clear. High 49°, low 36°.
0
Collinsville, Thursday, 29 October
Mostly clear. High 55°, low 32°.
0.03Collinsville, Friday, 30 October
Light rain. High 52°, low 40°.
0.46Collinsville, Saturday, 31 October
Rain. High 48°, low 46°.
0.11Collinsville, Sunday, 1 November
Light rain. High 67°, low 48°.
0
Collinsville, Monday, 2 November
Partly cloudy. High 55°, low 41°.
0.05Collinsville, Tuesday, 3 November
Light rain. High 46°, low 40°.
0.16Collinsville, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.16Collinsville, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09
Collinsville, Friday, 6 November
Climate normal for this date — 60-year average.
0.08Collinsville, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Collinsville, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1Collinsville, Monday, 9 November
Climate normal for this date — 60-year average.
0.13Collinsville, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.11Collinsville, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.09Collinsville, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Collinsville, Friday, 13 November
Climate normal for this date — 60-year average.
0.1Collinsville, Saturday, 14 November
Climate normal for this date — 60-year average.
0.13Collinsville, Sunday, 15 November
Climate normal for this date — 60-year average.
0.11Collinsville, Monday, 16 November
Climate normal for this date — 60-year average.
0.12Collinsville, Tuesday, 17 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 Collinsville, 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 Collinsville, 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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