Weather in Sycamore, IL
Sycamore, Wednesday, 7 October, 04:32
Clear. Feels like 54°. High 77°, low 55°.
Monthly outlook for Sycamore, IL: average high 62°, average low 46.8°. That is 0.3° above the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 10 October (79.4°), the coolest 18 October (31.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 7 October – 16 October | 67° | 62.7° | +2.4° |
| 17 October – 26 October | 53.5° | 58.3° | -2.6° |
| 27 October – 5 November | at normal | 54.2° | — |
October records over 66 years
0
Sycamore, Thursday, 8 October
Mostly clear. High 70°, low 51°.
0.29
Sycamore, Friday, 9 October
Heavy rain. High 68°, low 48°.
0
Sycamore, Saturday, 10 October
Clear. High 79°, low 60°.
0.05Sycamore, Sunday, 11 October
Light rain. High 66°, low 56°.
0Sycamore, Monday, 12 October
Light rain. High 76°, low 56°.
0.04Sycamore, Tuesday, 13 October
Light rain. High 55°, low 45°.
0
Sycamore, Wednesday, 14 October
Overcast. High 54°, low 42°.
1.28Sycamore, Thursday, 15 October
Heavy rain. High 73°, low 54°.
0Sycamore, Friday, 16 October
Clear. High 51°, low 42°.
0Sycamore, Saturday, 17 October
Light rain. High 44°, low 37°.
0
Sycamore, Sunday, 18 October
Partly cloudy. High 49°, low 31°.
0Sycamore, Monday, 19 October
Overcast. High 57°, low 39°.
0Sycamore, Tuesday, 20 October
Clear. High 59°, low 42°.
0.04Sycamore, Wednesday, 21 October
Light rain. High 57°, low 44°.
0.01Sycamore, Thursday, 22 October
Light rain. High 55°, low 46°.
0.11
Sycamore, Friday, 23 October
Climate normal for this date — 60-year average.
0.11Sycamore, Saturday, 24 October
Climate normal for this date — 60-year average.
0.1Sycamore, Sunday, 25 October
Climate normal for this date — 60-year average.
0.09Sycamore, Monday, 26 October
Climate normal for this date — 60-year average.
0.08Sycamore, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.04Sycamore, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Sycamore, Thursday, 29 October
Climate normal for this date — 60-year average.
0.1Sycamore, Friday, 30 October
Climate normal for this date — 60-year average.
0.11Sycamore, Saturday, 31 October
Climate normal for this date — 60-year average.
0.17Sycamore, Sunday, 1 November
Climate normal for this date — 60-year average.
0.1Sycamore, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Sycamore, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.1Sycamore, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.11Sycamore, Thursday, 5 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 Sycamore, 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 Sycamore, 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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