As of 20:20 CDT

Weather in Vandalia, IL

52°

Vandalia, Friday, 16 October, 20:20

Partly cloudy. Feels like 51°. High 62°, low 51°.

Pressure30.27 inHg

Wind1 mph E

Humidity83%

Visibility6.2 mi

Dew point47°

See detailed hourly forecast

Sat, 1762° / 42°

62 °

Vandalia, Saturday, 17 October

Clear. High 62°, low 42°.

Pressure30.56 inHg

Wind3.2 mph NE

Humidity54%

Visibility6.2 mi

Dew point38°

Sun, 1863° / 41°

63 °

Vandalia, Sunday, 18 October

Clear. High 63°, low 41°.

Pressure30.50 inHg

Wind7.4 mph S

Humidity40%

Visibility6.2 mi

Dew point35°

Mon, 1967° / 42°

67 °

Vandalia, Monday, 19 October

Clear. High 67°, low 42°.

Pressure30.42 inHg

Wind2.7 mph S

Humidity46%

Visibility6.2 mi

Dew point43°

Tue, 2069° / 45°

69 °

Vandalia, Tuesday, 20 October

Clear. High 69°, low 45°.

Pressure30.36 inHg

Wind1.5 mph E

Humidity49%

Visibility6.2 mi

Dew point45°

Wed, 2171° / 47°

71 °

Vandalia, Wednesday, 21 October

Overcast. High 71°, low 47°.

Pressure30.27 inHg

Wind3 mph E

Humidity42%

Visibility—

Dew point43°

Thu, 2275° / 52°

75 °

Vandalia, Thursday, 22 October

Partly cloudy. High 75°, low 52°.

Pressure30.18 inHg

Wind5.4 mph E

Humidity36%

Visibility—

Dew point41°

Fri, 2377° / 54°

77 °

Vandalia, Friday, 23 October

Partly cloudy. High 77°, low 54°.

Pressure30.21 inHg

Wind7.7 mph SE

Humidity26%

Visibility—

Dew point36°

Sat, 2478° / 55°

78 °

Vandalia, Saturday, 24 October

Overcast. High 78°, low 55°.

Pressure30.21 inHg

Wind7.7 mph S

Humidity23%

Visibility—

Dew point33°

Sun, 2571° / 56°

71 °

Vandalia, Sunday, 25 October

Overcast. High 71°, low 56°.

Pressure30.27 inHg

Wind11.2 mph N

Humidity40%

Visibility—

Dew point44°

Mon, 2672° / 53°

72 °

Vandalia, Monday, 26 October

Overcast. High 72°, low 53°.

Pressure30.27 inHg

Wind10.8 mph NE

Humidity41%

Visibility—

Dew point42°

Tue, 2779° / 58°

79 °

Vandalia, Tuesday, 27 October

Light rain. High 79°, low 58°.

Pressure30.12 inHg

Wind10 mph SW

Humidity32%

Visibility—

Dew point43°

Wed, 2864° / 52°

0.19

64 °

Vandalia, Wednesday, 28 October

Light rain. High 64°, low 52°.

Pressure30.09 inHg

Wind9.1 mph NE

Humidity85%

Visibility—

Dew point55°

Thu, 2960° / 48°

0.73

60 °

Vandalia, Thursday, 29 October

Rain. High 60°, low 48°.

Pressure29.94 inHg

Wind14.3 mph SE

Humidity91%

Visibility—

Dew point47°

Fri, 3072° / 53°

0.04

72 °

Vandalia, Friday, 30 October

Light rain. High 72°, low 53°.

Pressure29.62 inHg

Wind19.4 mph W

Humidity51%

Visibility—

Dew point52°

Sat, 3158° / 47°

58 °

Vandalia, Saturday, 31 October

Partly cloudy. High 58°, low 47°.

Pressure30.12 inHg

Wind16.6 mph N

Humidity45%

Visibility—

Dew point36°

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.