As of 06:23 CDT

Weather in Mount Vernon, IL

68°

Mount Vernon, Thursday, 15 October, 06:23

Overcast. Feels like 69°. High 82°, low 68°.

Pressure30.03 inHg

Wind0 mph N

Humidity97%

Visibility6.2 mi

Dew point68°

See detailed hourly forecast

Fri, 1669° / 51°

0.06

69 °

Mount Vernon, Friday, 16 October

Light rain. High 69°, low 51°.

Pressure30.15 inHg

Wind18 mph NW

Humidity46%

Visibility6.2 mi

Dew point37°

Sat, 1758° / 44°

58 °

Mount Vernon, Saturday, 17 October

Clear. High 58°, low 44°.

Pressure30.56 inHg

Wind6.5 mph N

Humidity52%

Visibility6.2 mi

Dew point38°

Sun, 1862° / 41°

62 °

Mount Vernon, Sunday, 18 October

Clear. High 62°, low 41°.

Pressure30.53 inHg

Wind6.9 mph SE

Humidity47%

Visibility6.2 mi

Dew point38°

Mon, 1967° / 42°

67 °

Mount Vernon, Monday, 19 October

Overcast. High 67°, low 42°.

Pressure30.39 inHg

Wind4 mph SE

Humidity40%

Visibility—

Dew point38°

Tue, 2070° / 47°

0.02

70 °

Mount Vernon, Tuesday, 20 October

Light rain. High 70°, low 47°.

Pressure30.30 inHg

Wind4 mph E

Humidity40%

Visibility—

Dew point41°

Wed, 2173° / 53°

73 °

Mount Vernon, Wednesday, 21 October

Clear. High 73°, low 53°.

Pressure30.30 inHg

Wind7.4 mph NE

Humidity34%

Visibility—

Dew point40°

Thu, 2274° / 51°

74 °

Mount Vernon, Thursday, 22 October

Partly cloudy. High 74°, low 51°.

Pressure30.27 inHg

Wind7.8 mph SE

Humidity28%

Visibility—

Dew point35°

Fri, 2377° / 54°

77 °

Mount Vernon, Friday, 23 October

Overcast. High 77°, low 54°.

Pressure30.15 inHg

Wind14 mph S

Humidity33%

Visibility—

Dew point41°

Sat, 2471° / 55°

0.03

71 °

Mount Vernon, Saturday, 24 October

Light rain. High 71°, low 55°.

Pressure30.15 inHg

Wind14.8 mph S

Humidity53%

Visibility—

Dew point51°

Sun, 2563° / 48°

0.28

63 °

Mount Vernon, Sunday, 25 October

Rain. High 63°, low 48°.

Pressure30.18 inHg

Wind17.2 mph NW

Humidity54%

Visibility—

Dew point44°

Mon, 2659° / 40°

59 °

Mount Vernon, Monday, 26 October

Clear. High 59°, low 40°.

Pressure30.39 inHg

Wind8 mph NW

Humidity25%

Visibility—

Dew point20°

Tue, 2763° / 42°

63 °

Mount Vernon, Tuesday, 27 October

Overcast. High 63°, low 42°.

Pressure30.21 inHg

Wind14.8 mph NW

Humidity29%

Visibility—

Dew point27°

Wed, 2862° / 38°

62 °

Mount Vernon, Wednesday, 28 October

Clear. High 62°, low 38°.

Pressure30.21 inHg

Wind8.4 mph SW

Humidity36%

Visibility—

Dew point29°

Thu, 2971° / 45°

71 °

Mount Vernon, Thursday, 29 October

Clear. High 71°, low 45°.

Pressure30.06 inHg

Wind11.7 mph W

Humidity31%

Visibility—

Dew point34°

Fri, 3051° / 40°

51 °

Mount Vernon, Friday, 30 October

Clear. High 51°, low 40°.

Pressure30.42 inHg

Wind17.7 mph N

Humidity28%

Visibility—

Dew point18°

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 Mount Vernon, 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 Mount Vernon, 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.