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As of 10:02 CDT

Weather in Lanark, IL

58°Current weather

Lanark, Thursday, 8 October, 10:02

Partly cloudy. Feels like 57°. High 71°, low 48°.

Pressure30.09 inHg
Wind3.9 mph NW
Humidity77%
Visibility6.2 mi
Dew point51°
Fri, 0972° / 49°0.15Rain
72 °Rain

Lanark, Friday, 9 October

Rain. High 72°, low 49°.

Pressure30.12 inHg
Wind9.1 mph SE
Humidity64%
Visibility6.2 mi
Dew point52°
Sat, 1076° / 59°0Overcast
76 °Overcast

Lanark, Saturday, 10 October

Overcast. High 76°, low 59°.

Pressure30.06 inHg
Wind8.7 mph S
Humidity61%
Visibility6.2 mi
Dew point59°
Sun, 1174° / 54°0Clear
74 °Clear

Lanark, Sunday, 11 October

Clear. High 74°, low 54°.

Pressure29.97 inHg
Wind4.8 mph SE
Humidity66%
Visibility6.2 mi
Dew point58°
Mon, 1280° / 59°0Partly cloudy
80 °Partly cloudy

Lanark, Monday, 12 October

Partly cloudy. High 80°, low 59°.

Pressure29.80 inHg
Wind10.2 mph SW
Humidity59%
Visibility—
Dew point60°
Tue, 1367° / 58°0.01Light rain
67 °Light rain

Lanark, Tuesday, 13 October

Light rain. High 67°, low 58°.

Pressure29.91 inHg
Wind10 mph NE
Humidity79%
Visibility—
Dew point59°
Wed, 1456° / 51°0.69Heavy rain
56 °Heavy rain

Lanark, Wednesday, 14 October

Heavy rain. High 56°, low 51°.

Pressure30.00 inHg
Wind16.2 mph E
Humidity89%
Visibility—
Dew point49°
Thu, 1583° / 61°0.17Light rain
83 °Light rain

Lanark, Thursday, 15 October

Light rain. High 83°, low 61°.

Pressure29.80 inHg
Wind18 mph SW
Humidity66%
Visibility—
Dew point67°
Fri, 1665° / 47°0Overcast
65 °Overcast

Lanark, Friday, 16 October

Overcast. High 65°, low 47°.

Pressure30.30 inHg
Wind16.4 mph NW
Humidity67%
Visibility—
Dew point43°
Sat, 1753° / 39°0Partly cloudy
53 °Partly cloudy

Lanark, Saturday, 17 October

Partly cloudy. High 53°, low 39°.

Pressure30.65 inHg
Wind11.3 mph NE
Humidity48%
Visibility—
Dew point31°
Sun, 1853° / 40°0Overcast
53 °Overcast

Lanark, Sunday, 18 October

Overcast. High 53°, low 40°.

Pressure30.47 inHg
Wind8.3 mph SE
Humidity47%
Visibility—
Dew point32°
Mon, 1964° / 46°0.02Light rain
64 °Light rain

Lanark, Monday, 19 October

Light rain. High 64°, low 46°.

Pressure30.12 inHg
Wind11.3 mph S
Humidity52%
Visibility—
Dew point42°
Tue, 2068° / 50°0Clear
68 °Clear

Lanark, Tuesday, 20 October

Clear. High 68°, low 50°.

Pressure30.12 inHg
Wind11.2 mph SW
Humidity49%
Visibility—
Dew point45°
Wed, 2166° / 48°0Mostly clear
66 °Mostly clear

Lanark, Wednesday, 21 October

Mostly clear. High 66°, low 48°.

Pressure30.06 inHg
Wind10.3 mph W
Humidity44%
Visibility—
Dew point40°
Thu, 2257° / 48°0.1Light rain
57 °Light rain

Lanark, Thursday, 22 October

Light rain. High 57°, low 48°.

Pressure29.88 inHg
Wind21.3 mph W
Humidity50%
Visibility—
Dew point38°
Fri, 2355° / 39°0Partly cloudy
55 °Partly cloudy

Lanark, Friday, 23 October

Partly cloudy. High 55°, low 39°.

Pressure30.15 inHg
Wind17.1 mph W
Humidity51%
Visibility—
Dew point33°

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 Lanark, 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 Lanark, 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.