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As of 06:10 CDT

Weather in Williamson, IL

50°Current weather

Williamson, Friday, 9 October, 06:10

Overcast. Feels like 49°. High 89°, low 50°.

Pressure30.09 inHg
Wind6.2 mph S
Humidity83%
Visibility6.2 mi
Dew point45°
Sat, 1080° / 55°0Overcast
80 °Overcast

Williamson, Saturday, 10 October

Overcast. High 80°, low 55°.

Pressure30.06 inHg
Wind6.4 mph SE
Humidity36%
Visibility6.2 mi
Dew point47°
Sun, 1183° / 60°0Clear
83 °Clear

Williamson, Sunday, 11 October

Clear. High 83°, low 60°.

Pressure29.94 inHg
Wind5.6 mph NW
Humidity49%
Visibility6.2 mi
Dew point55°
Mon, 1292° / 66°0Clear
92 °Clear

Williamson, Monday, 12 October

Clear. High 92°, low 66°.

Pressure29.88 inHg
Wind9.7 mph SW
Humidity38%
Visibility6.2 mi
Dew point58°
Tue, 1392° / 71°0Clear
92 °Clear

Williamson, Tuesday, 13 October

Clear. High 92°, low 71°.

Pressure29.83 inHg
Wind10.6 mph SW
Humidity43%
Visibility—
Dew point62°
Wed, 1481° / 67°1.04Rain
81 °Rain

Williamson, Wednesday, 14 October

Rain. High 81°, low 67°.

Pressure29.85 inHg
Wind10.9 mph SE
Humidity69%
Visibility—
Dew point68°
Thu, 1589° / 63°0.35Rain
89 °Rain

Williamson, Thursday, 15 October

Rain. High 89°, low 63°.

Pressure29.77 inHg
Wind18.7 mph S
Humidity49%
Visibility—
Dew point63°
Fri, 1662° / 49°0.01Light rain
62 °Light rain

Williamson, Friday, 16 October

Light rain. High 62°, low 49°.

Pressure30.18 inHg
Wind20.6 mph NW
Humidity35%
Visibility—
Dew point29°
Sat, 1751° / 41°0Partly cloudy
51 °Partly cloudy

Williamson, Saturday, 17 October

Partly cloudy. High 51°, low 41°.

Pressure30.33 inHg
Wind14 mph NW
Humidity48%
Visibility—
Dew point28°
Sun, 1858° / 37°0Clear
58 °Clear

Williamson, Sunday, 18 October

Clear. High 58°, low 37°.

Pressure30.33 inHg
Wind5.6 mph NE
Humidity41%
Visibility—
Dew point30°
Mon, 1965° / 42°0Partly cloudy
65 °Partly cloudy

Williamson, Monday, 19 October

Partly cloudy. High 65°, low 42°.

Pressure30.33 inHg
Wind7.1 mph E
Humidity39%
Visibility—
Dew point34°
Tue, 2067° / 45°0Clear
67 °Clear

Williamson, Tuesday, 20 October

Clear. High 67°, low 45°.

Pressure30.33 inHg
Wind7.6 mph E
Humidity34%
Visibility—
Dew point33°
Wed, 2170° / 47°0Clear
70 °Clear

Williamson, Wednesday, 21 October

Clear. High 70°, low 47°.

Pressure30.27 inHg
Wind6.5 mph E
Humidity33%
Visibility—
Dew point35°
Thu, 2271° / 50°0Clear
71 °Clear

Williamson, Thursday, 22 October

Clear. High 71°, low 50°.

Pressure30.21 inHg
Wind7.4 mph NE
Humidity32%
Visibility—
Dew point36°
Fri, 2372° / 50°0Clear
72 °Clear

Williamson, Friday, 23 October

Clear. High 72°, low 50°.

Pressure30.15 inHg
Wind7.7 mph N
Humidity43%
Visibility—
Dew point44°
Sat, 2472° / 51°0Clear
72 °Clear

Williamson, Saturday, 24 October

Clear. High 72°, low 51°.

Pressure30.06 inHg
Wind6 mph NE
Humidity40%
Visibility—
Dew point42°

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.