Weather in Lemont, IL
Lemont, Tuesday, 20 October, 03:04
Partly cloudy. Feels like 45°. High 69°, low 45°.
Monthly outlook for Lemont, IL: average high 59°, average low 43.8°. That is 1.3° above the climate normal for October. Precipitation is expected on 3 days (about 0.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 21 October (70.6°), the coolest 28 October (31°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 60.3° | 57.8° | +1.4° |
| 30 October – 8 November | 56.9° | 53.9° | +1.7° |
| 9 November – 18 November | at normal | 48.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Orland Hills (9 mi).
0
Lemont, Wednesday, 21 October
Clear. High 71°, low 44°.
0.01
Lemont, Thursday, 22 October
Light rain. High 67°, low 51°.
0
Lemont, Friday, 23 October
Mostly clear. High 62°, low 45°.
0
Lemont, Saturday, 24 October
Partly cloudy. High 63°, low 45°.
0.02Lemont, Sunday, 25 October
Light rain. High 67°, low 47°.
0
Lemont, Monday, 26 October
Overcast. High 61°, low 54°.
0.28Lemont, Tuesday, 27 October
Rain. High 53°, low 38°.
0Lemont, Wednesday, 28 October
Clear. High 41°, low 31°.
0Lemont, Thursday, 29 October
Mostly clear. High 49°, low 32°.
0Lemont, Friday, 30 October
Clear. High 55°, low 37°.
0Lemont, Saturday, 31 October
Overcast. High 61°, low 44°.
0.05Lemont, Sunday, 1 November
Light rain. High 59°, low 51°.
0.24Lemont, Monday, 2 November
Light rain. High 55°, low 51°.
0Lemont, Tuesday, 3 November
Partly cloudy. High 56°, low 46°.
0Lemont, Wednesday, 4 November
Mostly clear. High 55°, low 43°.
0.12Lemont, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07
Lemont, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Lemont, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Lemont, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13Lemont, Monday, 9 November
Climate normal for this date — 60-year average.
0.14Lemont, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Lemont, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Lemont, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Lemont, Friday, 13 November
Climate normal for this date — 60-year average.
0.08Lemont, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Lemont, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Lemont, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Lemont, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.14Lemont, Wednesday, 18 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 Lemont, 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 Lemont, 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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