As of 03:41 CDT

Weather in Lanark, IL

45°

Lanark, Thursday, 8 October, 03:41

Mostly clear. Feels like 43°. High 72°, low 45°.

Pressure30.00 inHg

Wind4.4 mph N

Humidity81%

Visibility6.2 mi

Dew point40°

See detailed hourly forecast

Fri, 0972° / 50°

0.03

72 °

Lanark, Friday, 9 October

Light rain. High 72°, low 50°.

Pressure30.09 inHg

Wind8.7 mph SE

Humidity63%

Visibility6.2 mi

Dew point52°

Sat, 1079° / 60°

79 °

Lanark, Saturday, 10 October

Clear. High 79°, low 60°.

Pressure30.06 inHg

Wind10.3 mph S

Humidity59%

Visibility6.2 mi

Dew point61°

Sun, 1174° / 57°

74 °

Lanark, Sunday, 11 October

Clear. High 74°, low 57°.

Pressure30.00 inHg

Wind5.8 mph S

Humidity58%

Visibility6.2 mi

Dew point56°

Mon, 1280° / 57°

80 °

Lanark, Monday, 12 October

Mostly clear. High 80°, low 57°.

Pressure29.80 inHg

Wind10.6 mph S

Humidity56%

Visibility—

Dew point58°

Tue, 1370° / 53°

70 °

Lanark, Tuesday, 13 October

Overcast. High 70°, low 53°.

Pressure29.94 inHg

Wind12.1 mph NW

Humidity59%

Visibility—

Dew point51°

Wed, 1463° / 45°

63 °

Lanark, Wednesday, 14 October

Overcast. High 63°, low 45°.

Pressure30.06 inHg

Wind18.5 mph SE

Humidity57%

Visibility—

Dew point42°

Thu, 1585° / 61°

0.22

85 °

Lanark, Thursday, 15 October

Rain. High 85°, low 61°.

Pressure29.74 inHg

Wind20.6 mph SW

Humidity60%

Visibility—

Dew point65°

Fri, 1669° / 50°

69 °

Lanark, Friday, 16 October

Clear. High 69°, low 50°.

Pressure30.09 inHg

Wind17 mph W

Humidity57%

Visibility—

Dew point46°

Sat, 1755° / 42°

55 °

Lanark, Saturday, 17 October

Overcast. High 55°, low 42°.

Pressure30.45 inHg

Wind11.6 mph NE

Humidity62%

Visibility—

Dew point40°

Sun, 1862° / 48°

0.01

62 °

Lanark, Sunday, 18 October

Light rain. High 62°, low 48°.

Pressure30.24 inHg

Wind5.1 mph W

Humidity57%

Visibility—

Dew point43°

Mon, 1958° / 53°

0.28

58 °

Lanark, Monday, 19 October

Light rain. High 58°, low 53°.

Pressure30.18 inHg

Wind6.7 mph SE

Humidity88%

Visibility—

Dew point54°

Tue, 2063° / 56°

0.03

63 °

Lanark, Tuesday, 20 October

Light rain. High 63°, low 56°.

Pressure30.12 inHg

Wind7.1 mph NW

Humidity79%

Visibility—

Dew point54°

Wed, 2167° / 51°

67 °

Lanark, Wednesday, 21 October

Mostly clear. High 67°, low 51°.

Pressure29.97 inHg

Wind7.7 mph SE

Humidity62%

Visibility—

Dew point50°

Thu, 2270° / 52°

0.08

70 °

Lanark, Thursday, 22 October

Light rain. High 70°, low 52°.

Pressure29.65 inHg

Wind18.5 mph S

Humidity57%

Visibility—

Dew point51°

Fri, 2378° / 59°

78 °

Lanark, Friday, 23 October

Clear. High 78°, low 59°.

Pressure29.77 inHg

Wind14.5 mph S

Humidity63%

Visibility—

Dew point61°

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.