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As of 14:57 CDT

Weather in Lanark, IL

81°Current weather

Lanark, Saturday, 8 August, 14:57

Clear. Feels like 85°. High 82°, low 66°.

Pressure30.00 inHg
Wind5.6 mph NW
Humidity68%
Visibility6.2 mi
Dew point70°
Sun, 0986° / 63°0.24Rain
86 °Rain

Lanark, Sunday, 9 August

Rain. High 86°, low 63°.

Pressure29.88 inHg
Wind15.5 mph SE
Humidity95%
Visibility6.2 mi
Dew point70°
Mon, 1084° / 72°0Overcast
84 °Overcast

Lanark, Monday, 10 August

Overcast. High 84°, low 72°.

Pressure29.88 inHg
Wind5.3 mph SW
Humidity78%
Visibility6.2 mi
Dew point73°
Tue, 1188° / 71°0.15Rain
88 °Rain

Lanark, Tuesday, 11 August

Rain. High 88°, low 71°.

Pressure29.80 inHg
Wind9.6 mph W
Humidity68%
Visibility6.2 mi
Dew point73°
Wed, 1280° / 67°0Light rain
80 °Light rain

Lanark, Wednesday, 12 August

Light rain. High 80°, low 67°.

Pressure29.85 inHg
Wind7.8 mph NE
Humidity81%
Visibility6.2 mi
Dew point70°
Thu, 1370° / 61°0.02Light rain
70 °Light rain

Lanark, Thursday, 13 August

Light rain. High 70°, low 61°.

Pressure29.97 inHg
Wind12.2 mph NE
Humidity77%
Visibility—
Dew point61°
Fri, 1474° / 56°0Clear
74 °Clear

Lanark, Friday, 14 August

Clear. High 74°, low 56°.

Pressure30.21 inHg
Wind7 mph NE
Humidity59%
Visibility—
Dew point55°
Sat, 1574° / 55°0Overcast
74 °Overcast

Lanark, Saturday, 15 August

Overcast. High 74°, low 55°.

Pressure30.30 inHg
Wind8.6 mph S
Humidity62%
Visibility—
Dew point57°
Sun, 1676° / 57°0Overcast
76 °Overcast

Lanark, Sunday, 16 August

Overcast. High 76°, low 57°.

Pressure30.15 inHg
Wind11.1 mph S
Humidity66%
Visibility—
Dew point61°
Mon, 1783° / 66°0.02Light rain
83 °Light rain

Lanark, Monday, 17 August

Light rain. High 83°, low 66°.

Pressure29.97 inHg
Wind7.2 mph S
Humidity76%
Visibility—
Dew point71°
Tue, 1883° / 68°0Partly cloudy
83 °Partly cloudy

Lanark, Tuesday, 18 August

Partly cloudy. High 83°, low 68°.

Pressure30.03 inHg
Wind8.1 mph SE
Humidity65%
Visibility—
Dew point67°
Wed, 1982° / 67°0.31Light rain
82 °Light rain

Lanark, Wednesday, 19 August

Light rain. High 82°, low 67°.

Pressure29.88 inHg
Wind10.3 mph S
Humidity77%
Visibility—
Dew point71°
Thu, 2077° / 65°0.04Light rain
77 °Light rain

Lanark, Thursday, 20 August

Light rain. High 77°, low 65°.

Pressure29.94 inHg
Wind9.6 mph NE
Humidity67%
Visibility—
Dew point63°
Fri, 2181° / 62°0.06Light rain
81 °Light rain

Lanark, Friday, 21 August

Light rain. High 81°, low 62°.

Pressure29.97 inHg
Wind6.5 mph S
Humidity60%
Visibility—
Dew point62°
Sat, 2271° / 56°0.05Light rain
71 °Light rain

Lanark, Saturday, 22 August

Light rain. High 71°, low 56°.

Pressure30.00 inHg
Wind16.6 mph NE
Humidity87%
Visibility—
Dew point60°
Sun, 2368° / 45°0Clear
68 °Clear

Lanark, Sunday, 23 August

Clear. High 68°, low 45°.

Pressure30.24 inHg
Wind11 mph E
Humidity53%
Visibility—
Dew point46°

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.