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As of 20:46 CDT

Weather in Vandalia, IL

80°Current weather

Vandalia, Saturday, 8 August, 20:46

Clear. Feels like 85°. High 89°, low 71°.

Pressure30.00 inHg
Wind3.6 mph SE
Humidity80%
Visibility6.2 mi
Dew point73°
Sun, 0994° / 73°0Overcast
94 °Overcast

Vandalia, Sunday, 9 August

Overcast. High 94°, low 73°.

Pressure30.00 inHg
Wind13.7 mph S
Humidity64%
Visibility6.2 mi
Dew point72°
Mon, 1094° / 74°0Overcast
94 °Overcast

Vandalia, Monday, 10 August

Overcast. High 94°, low 74°.

Pressure29.97 inHg
Wind14.1 mph SW
Humidity64%
Visibility6.2 mi
Dew point74°
Tue, 1196° / 76°0.01Light rain
96 °Light rain

Vandalia, Tuesday, 11 August

Light rain. High 96°, low 76°.

Pressure29.88 inHg
Wind12.2 mph SW
Humidity57%
Visibility6.2 mi
Dew point73°
Wed, 1287° / 71°0.19Light rain
87 °Light rain

Vandalia, Wednesday, 12 August

Light rain. High 87°, low 71°.

Pressure29.85 inHg
Wind4.9 mph W
Humidity63%
Visibility6.2 mi
Dew point71°
Thu, 1382° / 65°1.41Heavy rain
82 °Heavy rain

Vandalia, Thursday, 13 August

Heavy rain. High 82°, low 65°.

Pressure29.94 inHg
Wind13.2 mph E
Humidity73%
Visibility—
Dew point71°
Fri, 1474° / 66°0.7Rain
74 °Rain

Vandalia, Friday, 14 August

Rain. High 74°, low 66°.

Pressure30.06 inHg
Wind10.1 mph E
Humidity95%
Visibility—
Dew point67°
Sat, 1574° / 66°0.13Light rain
74 °Light rain

Vandalia, Saturday, 15 August

Light rain. High 74°, low 66°.

Pressure30.21 inHg
Wind14.5 mph E
Humidity79%
Visibility—
Dew point64°
Sun, 1678° / 64°0.24Light rain
78 °Light rain

Vandalia, Sunday, 16 August

Light rain. High 78°, low 64°.

Pressure30.06 inHg
Wind8.9 mph E
Humidity80%
Visibility—
Dew point69°
Mon, 1780° / 67°0.19Light rain
80 °Light rain

Vandalia, Monday, 17 August

Light rain. High 80°, low 67°.

Pressure30.03 inHg
Wind7 mph NE
Humidity85%
Visibility—
Dew point70°
Tue, 1882° / 67°0.02Light rain
82 °Light rain

Vandalia, Tuesday, 18 August

Light rain. High 82°, low 67°.

Pressure30.03 inHg
Wind6.4 mph E
Humidity75%
Visibility—
Dew point71°
Wed, 1984° / 69°0Overcast
84 °Overcast

Vandalia, Wednesday, 19 August

Overcast. High 84°, low 69°.

Pressure29.91 inHg
Wind13.4 mph N
Humidity70%
Visibility—
Dew point71°
Thu, 2075° / 56°0Mostly clear
75 °Mostly clear

Vandalia, Thursday, 20 August

Mostly clear. High 75°, low 56°.

Pressure30.03 inHg
Wind13.9 mph NE
Humidity62%
Visibility—
Dew point57°
Fri, 2174° / 55°0.02Light rain
74 °Light rain

Vandalia, Friday, 21 August

Light rain. High 74°, low 55°.

Pressure30.03 inHg
Wind11.1 mph E
Humidity59%
Visibility—
Dew point55°
Sat, 2283° / 60°0.11Light rain
83 °Light rain

Vandalia, Saturday, 22 August

Light rain. High 83°, low 60°.

Pressure29.85 inHg
Wind12.1 mph SE
Humidity68%
Visibility—
Dew point67°
Sun, 2389° / 70°0Clear
89 °Clear

Vandalia, Sunday, 23 August

Clear. High 89°, low 70°.

Pressure29.94 inHg
Wind6 mph W
Humidity60%
Visibility—
Dew point69°

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.