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As of 11:08 CDT

Weather in Hornsby, IL

86°Current weather

Hornsby, Sunday, 9 August, 11:08

Overcast. Feels like 96°. High 93°, low 71°.

Pressure30.00 inHg
Wind13.4 mph S
Humidity73%
Visibility6.2 mi
Dew point77°
Mon, 1099° / 75°0.01Light rain
99 °Light rain

Hornsby, Monday, 10 August

Light rain. High 99°, low 75°.

Pressure29.94 inHg
Wind11.1 mph SW
Humidity64%
Visibility6.2 mi
Dew point74°
Tue, 1194° / 72°0.03Light rain
94 °Light rain

Hornsby, Tuesday, 11 August

Light rain. High 94°, low 72°.

Pressure29.91 inHg
Wind12.8 mph SW
Humidity66%
Visibility6.2 mi
Dew point74°
Wed, 1289° / 75°0Overcast
89 °Overcast

Hornsby, Wednesday, 12 August

Overcast. High 89°, low 75°.

Pressure29.83 inHg
Wind1.9 mph NW
Humidity73%
Visibility6.2 mi
Dew point73°
Thu, 1384° / 70°1.37Heavy rain
84 °Heavy rain

Hornsby, Thursday, 13 August

Heavy rain. High 84°, low 70°.

Pressure29.88 inHg
Wind19.5 mph NE
Humidity90%
Visibility—
Dew point72°
Fri, 1479° / 69°0.01Light rain
79 °Light rain

Hornsby, Friday, 14 August

Light rain. High 79°, low 69°.

Pressure30.00 inHg
Wind14.2 mph E
Humidity82%
Visibility—
Dew point72°
Sat, 1585° / 68°0Overcast
85 °Overcast

Hornsby, Saturday, 15 August

Overcast. High 85°, low 68°.

Pressure30.09 inHg
Wind12.1 mph SE
Humidity78%
Visibility—
Dew point72°
Sun, 1684° / 72°0Overcast
84 °Overcast

Hornsby, Sunday, 16 August

Overcast. High 84°, low 72°.

Pressure30.03 inHg
Wind12.2 mph N
Humidity79%
Visibility—
Dew point75°
Mon, 1778° / 62°0Overcast
78 °Overcast

Hornsby, Monday, 17 August

Overcast. High 78°, low 62°.

Pressure30.09 inHg
Wind8.3 mph NE
Humidity65%
Visibility—
Dew point62°
Tue, 1885° / 65°0.02Light rain
85 °Light rain

Hornsby, Tuesday, 18 August

Light rain. High 85°, low 65°.

Pressure29.85 inHg
Wind12.8 mph S
Humidity70%
Visibility—
Dew point68°
Wed, 1986° / 68°0Partly cloudy
86 °Partly cloudy

Hornsby, Wednesday, 19 August

Partly cloudy. High 86°, low 68°.

Pressure29.85 inHg
Wind13.3 mph N
Humidity67%
Visibility—
Dew point72°
Thu, 2079° / 61°0Clear
79 °Clear

Hornsby, Thursday, 20 August

Clear. High 79°, low 61°.

Pressure29.97 inHg
Wind6.8 mph N
Humidity65%
Visibility—
Dew point62°
Fri, 2188° / 63°0Partly cloudy
88 °Partly cloudy

Hornsby, Friday, 21 August

Partly cloudy. High 88°, low 63°.

Pressure29.83 inHg
Wind15.3 mph S
Humidity59%
Visibility—
Dew point64°
Sat, 2288° / 70°0Clear
88 °Clear

Hornsby, Saturday, 22 August

Clear. High 88°, low 70°.

Pressure29.83 inHg
Wind13.3 mph N
Humidity57%
Visibility—
Dew point67°
Sun, 2379° / 60°0Clear
79 °Clear

Hornsby, Sunday, 23 August

Clear. High 79°, low 60°.

Pressure30.15 inHg
Wind8.5 mph NE
Humidity52%
Visibility—
Dew point56°
Mon, 2479° / 59°0Clear
79 °Clear

Hornsby, Monday, 24 August

Clear. High 79°, low 59°.

Pressure30.21 inHg
Wind7.8 mph SE
Humidity52%
Visibility—
Dew point56°

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 Hornsby, 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 Hornsby, 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.