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As of 17:30 CDT

Weather in Castleton, IL

84°Current weather

Castleton, Saturday, 8 August, 17:30

Clear. Feels like 89°. High 84°, low 68°.

Pressure30.00 inHg
Wind1.6 mph NW
Humidity65%
Visibility6.2 mi
Dew point71°
Sun, 0990° / 66°0.01Light rain
90 °Light rain

Castleton, Sunday, 9 August

Light rain. High 90°, low 66°.

Pressure29.91 inHg
Wind11.6 mph SW
Humidity70%
Visibility6.2 mi
Dew point75°
Mon, 1087° / 75°0Overcast
87 °Overcast

Castleton, Monday, 10 August

Overcast. High 87°, low 75°.

Pressure29.91 inHg
Wind9.1 mph SW
Humidity70%
Visibility6.2 mi
Dew point73°
Tue, 1188° / 72°0Overcast
88 °Overcast

Castleton, Tuesday, 11 August

Overcast. High 88°, low 72°.

Pressure29.77 inHg
Wind13.9 mph S
Humidity72%
Visibility6.2 mi
Dew point70°
Wed, 1278° / 69°0.06Light rain
78 °Light rain

Castleton, Wednesday, 12 August

Light rain. High 78°, low 69°.

Pressure29.88 inHg
Wind8.1 mph E
Humidity83%
Visibility6.2 mi
Dew point69°
Thu, 1372° / 65°0.28Rain
72 °Rain

Castleton, Thursday, 13 August

Rain. High 72°, low 65°.

Pressure29.91 inHg
Wind11.4 mph NE
Humidity91%
Visibility—
Dew point67°
Fri, 1474° / 55°0Clear
74 °Clear

Castleton, Friday, 14 August

Clear. High 74°, low 55°.

Pressure30.18 inHg
Wind7.3 mph NE
Humidity63%
Visibility—
Dew point57°
Sat, 1574° / 56°0Overcast
74 °Overcast

Castleton, Saturday, 15 August

Overcast. High 74°, low 56°.

Pressure30.30 inHg
Wind7.8 mph SE
Humidity60%
Visibility—
Dew point56°
Sun, 1678° / 57°0Overcast
78 °Overcast

Castleton, Sunday, 16 August

Overcast. High 78°, low 57°.

Pressure30.18 inHg
Wind10.8 mph S
Humidity70%
Visibility—
Dew point60°
Mon, 1780° / 66°0.01Light rain
80 °Light rain

Castleton, Monday, 17 August

Light rain. High 80°, low 66°.

Pressure29.97 inHg
Wind7.4 mph SE
Humidity84%
Visibility—
Dew point71°
Tue, 1883° / 70°0Light rain
83 °Light rain

Castleton, Tuesday, 18 August

Light rain. High 83°, low 70°.

Pressure30.00 inHg
Wind8.4 mph NE
Humidity68%
Visibility—
Dew point69°
Wed, 1987° / 67°0.27Light rain
87 °Light rain

Castleton, Wednesday, 19 August

Light rain. High 87°, low 67°.

Pressure29.91 inHg
Wind8.5 mph S
Humidity69%
Visibility—
Dew point71°
Thu, 2079° / 66°0.35Rain
79 °Rain

Castleton, Thursday, 20 August

Rain. High 79°, low 66°.

Pressure29.91 inHg
Wind10.5 mph N
Humidity71%
Visibility—
Dew point67°
Fri, 2180° / 62°0.01Light rain
80 °Light rain

Castleton, Friday, 21 August

Light rain. High 80°, low 62°.

Pressure29.97 inHg
Wind6.8 mph NE
Humidity60%
Visibility—
Dew point61°
Sat, 2279° / 59°0.02Light rain
79 °Light rain

Castleton, Saturday, 22 August

Light rain. High 79°, low 59°.

Pressure29.94 inHg
Wind17.5 mph NE
Humidity65%
Visibility—
Dew point64°
Sun, 2367° / 48°0Mostly clear
67 °Mostly clear

Castleton, Sunday, 23 August

Mostly clear. High 67°, low 48°.

Pressure30.24 inHg
Wind13.1 mph E
Humidity50%
Visibility—
Dew point44°

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 Castleton, 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 Castleton, 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.