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As of 09:08 CDT

Weather in Williamson, IL

59°Current weather

Williamson, Thursday, 8 October, 09:08

Clear. Feels like 59°. High 83°, low 54°.

Pressure30.09 inHg
Wind1.6 mph SW
Humidity82%
Visibility6.2 mi
Dew point54°
Fri, 0986° / 55°0Clear
86 °Clear

Williamson, Friday, 9 October

Clear. High 86°, low 55°.

Pressure30.12 inHg
Wind8.4 mph S
Humidity27%
Visibility6.2 mi
Dew point44°
Sat, 1082° / 57°0Light rain
82 °Light rain

Williamson, Saturday, 10 October

Light rain. High 82°, low 57°.

Pressure30.09 inHg
Wind5.7 mph SE
Humidity44%
Visibility6.2 mi
Dew point55°
Sun, 1179° / 60°0Clear
79 °Clear

Williamson, Sunday, 11 October

Clear. High 79°, low 60°.

Pressure29.94 inHg
Wind7.3 mph N
Humidity53%
Visibility6.2 mi
Dew point57°
Mon, 1291° / 61°0Mostly clear
91 °Mostly clear

Williamson, Monday, 12 October

Mostly clear. High 91°, low 61°.

Pressure29.88 inHg
Wind9.8 mph SW
Humidity36%
Visibility—
Dew point54°
Tue, 1389° / 69°0Overcast
89 °Overcast

Williamson, Tuesday, 13 October

Overcast. High 89°, low 69°.

Pressure29.85 inHg
Wind10.2 mph SW
Humidity44%
Visibility—
Dew point61°
Wed, 1491° / 63°0Overcast
91 °Overcast

Williamson, Wednesday, 14 October

Overcast. High 91°, low 63°.

Pressure29.91 inHg
Wind12.8 mph S
Humidity47%
Visibility—
Dew point58°
Thu, 1594° / 76°0.02Light rain
94 °Light rain

Williamson, Thursday, 15 October

Light rain. High 94°, low 76°.

Pressure29.91 inHg
Wind18.1 mph SW
Humidity37%
Visibility—
Dew point61°
Fri, 1677° / 55°0.52Rain
77 °Rain

Williamson, Friday, 16 October

Rain. High 77°, low 55°.

Pressure30.24 inHg
Wind14.1 mph N
Humidity67%
Visibility—
Dew point54°
Sat, 1764° / 48°0Overcast
64 °Overcast

Williamson, Saturday, 17 October

Overcast. High 64°, low 48°.

Pressure30.53 inHg
Wind14.5 mph NE
Humidity45%
Visibility—
Dew point39°
Sun, 1866° / 43°0Overcast
66 °Overcast

Williamson, Sunday, 18 October

Overcast. High 66°, low 43°.

Pressure30.39 inHg
Wind9.6 mph E
Humidity32%
Visibility—
Dew point30°
Mon, 1972° / 53°0.07Light rain
72 °Light rain

Williamson, Monday, 19 October

Light rain. High 72°, low 53°.

Pressure30.21 inHg
Wind14.8 mph S
Humidity63%
Visibility—
Dew point57°
Tue, 2076° / 60°0.09Light rain
76 °Light rain

Williamson, Tuesday, 20 October

Light rain. High 76°, low 60°.

Pressure30.18 inHg
Wind10.4 mph S
Humidity63%
Visibility—
Dew point59°
Wed, 2177° / 58°0.07Light rain
77 °Light rain

Williamson, Wednesday, 21 October

Light rain. High 77°, low 58°.

Pressure30.09 inHg
Wind7.6 mph SW
Humidity60%
Visibility—
Dew point58°
Thu, 2272° / 52°0.04Light rain
72 °Light rain

Williamson, Thursday, 22 October

Light rain. High 72°, low 52°.

Pressure29.94 inHg
Wind18 mph W
Humidity63%
Visibility—
Dew point57°
Fri, 2365° / 44°0Clear
65 °Clear

Williamson, Friday, 23 October

Clear. High 65°, low 44°.

Pressure30.18 inHg
Wind9.7 mph SE
Humidity35%
Visibility—
Dew point32°

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.