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As of 21:35 CDT

Weather in Harristown, IL

73°Current weather

Harristown, Saturday, 8 August, 21:35

Clear. Feels like 74°. High 87°, low 70°.

Pressure30.00 inHg
Wind6.7 mph SE
Humidity89%
Visibility6.2 mi
Dew point69°
Sun, 0993° / 71°0Clear
93 °Clear

Harristown, Sunday, 9 August

Clear. High 93°, low 71°.

Pressure29.97 inHg
Wind14.2 mph S
Humidity65%
Visibility6.2 mi
Dew point73°
Mon, 1092° / 75°0.02Light rain
92 °Light rain

Harristown, Monday, 10 August

Light rain. High 92°, low 75°.

Pressure29.94 inHg
Wind14.4 mph SW
Humidity60%
Visibility6.2 mi
Dew point73°
Tue, 1192° / 73°0.05Light rain
92 °Light rain

Harristown, Tuesday, 11 August

Light rain. High 92°, low 73°.

Pressure29.83 inHg
Wind16.2 mph SW
Humidity58%
Visibility6.2 mi
Dew point69°
Wed, 1284° / 72°0.82Heavy rain
84 °Heavy rain

Harristown, Wednesday, 12 August

Heavy rain. High 84°, low 72°.

Pressure29.85 inHg
Wind1.5 mph NW
Humidity82%
Visibility6.2 mi
Dew point75°
Thu, 1383° / 64°1.91Heavy rain
83 °Heavy rain

Harristown, Thursday, 13 August

Heavy rain. High 83°, low 64°.

Pressure29.94 inHg
Wind14.6 mph SE
Humidity65%
Visibility—
Dew point68°
Fri, 1478° / 64°0.01Light rain
78 °Light rain

Harristown, Friday, 14 August

Light rain. High 78°, low 64°.

Pressure30.06 inHg
Wind11.9 mph E
Humidity71%
Visibility—
Dew point64°
Sat, 1569° / 63°0.04Light rain
69 °Light rain

Harristown, Saturday, 15 August

Light rain. High 69°, low 63°.

Pressure30.24 inHg
Wind15.3 mph E
Humidity80%
Visibility—
Dew point58°
Sun, 1674° / 63°0.06Light rain
74 °Light rain

Harristown, Sunday, 16 August

Light rain. High 74°, low 63°.

Pressure30.09 inHg
Wind10.4 mph E
Humidity84%
Visibility—
Dew point64°
Mon, 1778° / 64°0.06Light rain
78 °Light rain

Harristown, Monday, 17 August

Light rain. High 78°, low 64°.

Pressure30.06 inHg
Wind6.4 mph NE
Humidity81%
Visibility—
Dew point67°
Tue, 1882° / 65°0Overcast
82 °Overcast

Harristown, Tuesday, 18 August

Overcast. High 82°, low 65°.

Pressure30.03 inHg
Wind6 mph SE
Humidity70%
Visibility—
Dew point67°
Wed, 1984° / 61°0Overcast
84 °Overcast

Harristown, Wednesday, 19 August

Overcast. High 84°, low 61°.

Pressure29.91 inHg
Wind13.5 mph N
Humidity71%
Visibility—
Dew point72°
Thu, 2073° / 54°0Partly cloudy
73 °Partly cloudy

Harristown, Thursday, 20 August

Partly cloudy. High 73°, low 54°.

Pressure30.03 inHg
Wind13.1 mph NE
Humidity65%
Visibility—
Dew point55°
Fri, 2173° / 53°0Overcast
73 °Overcast

Harristown, Friday, 21 August

Overcast. High 73°, low 53°.

Pressure30.03 inHg
Wind11.7 mph E
Humidity57%
Visibility—
Dew point54°
Sat, 2278° / 60°0.07Light rain
78 °Light rain

Harristown, Saturday, 22 August

Light rain. High 78°, low 60°.

Pressure29.85 inHg
Wind14.4 mph S
Humidity69%
Visibility—
Dew point65°
Sun, 2387° / 67°0Mostly clear
87 °Mostly clear

Harristown, Sunday, 23 August

Mostly clear. High 87°, low 67°.

Pressure29.94 inHg
Wind8.1 mph W
Humidity60%
Visibility—
Dew point67°

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 Harristown, 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 Harristown, 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.