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As of 16:51 CDT

Weather in Williamson, IL

89°Current weather

Williamson, Saturday, 8 August, 16:51

Clear. Feels like 99°. High 89°, low 70°.

Pressure30.00 inHg
Wind3.1 mph S
Humidity63%
Visibility6.2 mi
Dew point75°
Sun, 0994° / 73°0Overcast
94 °Overcast

Williamson, Sunday, 9 August

Overcast. High 94°, low 73°.

Pressure29.97 inHg
Wind14.2 mph S
Humidity70%
Visibility6.2 mi
Dew point75°
Mon, 1095° / 73°0Clear
95 °Clear

Williamson, Monday, 10 August

Clear. High 95°, low 73°.

Pressure29.94 inHg
Wind10.9 mph SW
Humidity61%
Visibility6.2 mi
Dew point75°
Tue, 1189° / 74°0.07Rain
89 °Rain

Williamson, Tuesday, 11 August

Rain. High 89°, low 74°.

Pressure29.88 inHg
Wind11.6 mph SW
Humidity64%
Visibility6.2 mi
Dew point74°
Wed, 1284° / 72°0.04Light rain
84 °Light rain

Williamson, Wednesday, 12 August

Light rain. High 84°, low 72°.

Pressure29.85 inHg
Wind3.9 mph W
Humidity63%
Visibility6.2 mi
Dew point72°
Thu, 1377° / 70°0.64Rain
77 °Rain

Williamson, Thursday, 13 August

Rain. High 77°, low 70°.

Pressure29.88 inHg
Wind9.7 mph SE
Humidity87%
Visibility—
Dew point72°
Fri, 1475° / 62°0Mostly clear
75 °Mostly clear

Williamson, Friday, 14 August

Mostly clear. High 75°, low 62°.

Pressure30.15 inHg
Wind10.8 mph NE
Humidity55%
Visibility—
Dew point55°
Sat, 1575° / 56°0Partly cloudy
75 °Partly cloudy

Williamson, Saturday, 15 August

Partly cloudy. High 75°, low 56°.

Pressure30.30 inHg
Wind8.7 mph E
Humidity57%
Visibility—
Dew point55°
Sun, 1674° / 59°0.04Light rain
74 °Light rain

Williamson, Sunday, 16 August

Light rain. High 74°, low 59°.

Pressure30.18 inHg
Wind10.9 mph SE
Humidity74%
Visibility—
Dew point63°
Mon, 1792° / 69°0.19Light rain
92 °Light rain

Williamson, Monday, 17 August

Light rain. High 92°, low 69°.

Pressure29.94 inHg
Wind16.7 mph S
Humidity64%
Visibility—
Dew point71°
Tue, 1885° / 72°0Overcast
85 °Overcast

Williamson, Tuesday, 18 August

Overcast. High 85°, low 72°.

Pressure30.00 inHg
Wind10.3 mph NE
Humidity68%
Visibility—
Dew point71°
Wed, 1988° / 70°0Overcast
88 °Overcast

Williamson, Wednesday, 19 August

Overcast. High 88°, low 70°.

Pressure29.91 inHg
Wind7.8 mph S
Humidity68%
Visibility—
Dew point72°
Thu, 2083° / 72°2.01Heavy rain
83 °Heavy rain

Williamson, Thursday, 20 August

Heavy rain. High 83°, low 72°.

Pressure29.88 inHg
Wind9.3 mph N
Humidity74%
Visibility—
Dew point72°
Fri, 2181° / 69°0.06Light rain
81 °Light rain

Williamson, Friday, 21 August

Light rain. High 81°, low 69°.

Pressure29.94 inHg
Wind7.7 mph NE
Humidity76%
Visibility—
Dew point67°
Sat, 2283° / 64°0Overcast
83 °Overcast

Williamson, Saturday, 22 August

Overcast. High 83°, low 64°.

Pressure29.94 inHg
Wind17.1 mph NE
Humidity58%
Visibility—
Dew point63°
Sun, 2371° / 60°0.04Light rain
71 °Light rain

Williamson, Sunday, 23 August

Light rain. High 71°, low 60°.

Pressure30.15 inHg
Wind13.8 mph NE
Humidity77%
Visibility—
Dew point55°

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 Williamson, 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 Williamson, 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.