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As of 18:00 CDT

Weather in Vandalia, IL

68°Current weather

Vandalia, Tuesday, 20 October, 18:00

Clear. Feels like 67°. High 72°, low 45°.

Pressure30.27 inHg
Wind0.8 mph E
Humidity43%
Visibility6.2 mi
Dew point46°
Wed, 2174° / 46°0Partly cloudy
74 °Partly cloudy

Vandalia, Wednesday, 21 October

Partly cloudy. High 74°, low 46°.

Pressure30.27 inHg
Wind0.4 mph W
Humidity46%
Visibility6.2 mi
Dew point47°
Thu, 2272° / 49°0Clear
72 °Clear

Vandalia, Thursday, 22 October

Clear. High 72°, low 49°.

Pressure30.27 inHg
Wind3.3 mph NE
Humidity48%
Visibility6.2 mi
Dew point50°
Fri, 2370° / 51°0Clear
70 °Clear

Vandalia, Friday, 23 October

Clear. High 70°, low 51°.

Pressure30.33 inHg
Wind7.4 mph SE
Humidity47%
Visibility6.2 mi
Dew point48°
Sat, 2471° / 49°0Overcast
71 °Overcast

Vandalia, Saturday, 24 October

Overcast. High 71°, low 49°.

Pressure30.36 inHg
Wind5.4 mph SE
Humidity54%
Visibility6.2 mi
Dew point49°
Sun, 2574° / 53°0Overcast
74 °Overcast

Vandalia, Sunday, 25 October

Overcast. High 74°, low 53°.

Pressure30.36 inHg
Wind6.6 mph SW
Humidity43%
Visibility—
Dew point47°
Mon, 2675° / 54°0Overcast
75 °Overcast

Vandalia, Monday, 26 October

Overcast. High 75°, low 54°.

Pressure30.21 inHg
Wind9.8 mph SW
Humidity35%
Visibility—
Dew point42°
Tue, 2765° / 53°0Overcast
65 °Overcast

Vandalia, Tuesday, 27 October

Overcast. High 65°, low 53°.

Pressure30.21 inHg
Wind10.6 mph NW
Humidity57%
Visibility—
Dew point47°
Wed, 2851° / 40°0.02Light rain
51 °Light rain

Vandalia, Wednesday, 28 October

Light rain. High 51°, low 40°.

Pressure30.24 inHg
Wind20.8 mph NW
Humidity47%
Visibility—
Dew point28°
Thu, 2957° / 35°0Clear
57 °Clear

Vandalia, Thursday, 29 October

Clear. High 57°, low 35°.

Pressure30.27 inHg
Wind12.5 mph NW
Humidity32%
Visibility—
Dew point23°
Fri, 3056° / 32°0Clear
56 °Clear

Vandalia, Friday, 30 October

Clear. High 56°, low 32°.

Pressure30.27 inHg
Wind8.2 mph SE
Humidity25%
Visibility—
Dew point15°
Sat, 3160° / 38°0.01Light rain
60 °Light rain

Vandalia, Saturday, 31 October

Light rain. High 60°, low 38°.

Pressure30.00 inHg
Wind15.4 mph S
Humidity34%
Visibility—
Dew point29°
Sun, 0166° / 55°0.07Light rain
66 °Light rain

Vandalia, Sunday, 1 November

Light rain. High 66°, low 55°.

Pressure29.88 inHg
Wind20.1 mph S
Humidity77%
Visibility—
Dew point57°
Mon, 0268° / 48°0.24Rain
68 °Rain

Vandalia, Monday, 2 November

Rain. High 68°, low 48°.

Pressure30.09 inHg
Wind18.7 mph N
Humidity46%
Visibility—
Dew point46°
Tue, 0357° / 38°0Clear
57 °Clear

Vandalia, Tuesday, 3 November

Clear. High 57°, low 38°.

Pressure30.47 inHg
Wind10.2 mph N
Humidity21%
Visibility—
Dew point14°
Wed, 0457° / 41°0.03Light rain
57 °Light rain

Vandalia, Wednesday, 4 November

Light rain. High 57°, low 41°.

Pressure30.33 inHg
Wind11.7 mph SW
Humidity28%
Visibility—
Dew point22°

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 Vandalia, 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 Vandalia, 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.