As of 20:03 CDT

Weather in Mount Vernon, IL

46°

Mount Vernon, Saturday, 17 October, 20:03

Clear. Feels like 44°. High 59°, low 42°.

Pressure30.47 inHg

Wind3.7 mph NE

Humidity72%

Visibility6.2 mi

Dew point38°

See detailed hourly forecast

Sun, 1863° / 38°

63 °

Mount Vernon, Sunday, 18 October

Clear. High 63°, low 38°.

Pressure30.47 inHg

Wind7 mph SE

Humidity47%

Visibility6.2 mi

Dew point39°

Mon, 1967° / 44°

67 °

Mount Vernon, Monday, 19 October

Clear. High 67°, low 44°.

Pressure30.39 inHg

Wind1.1 mph SW

Humidity44%

Visibility6.2 mi

Dew point43°

Tue, 2069° / 46°

69 °

Mount Vernon, Tuesday, 20 October

Partly cloudy. High 69°, low 46°.

Pressure30.36 inHg

Wind2.8 mph NE

Humidity44%

Visibility6.2 mi

Dew point44°

Wed, 2171° / 51°

71 °

Mount Vernon, Wednesday, 21 October

Mostly clear. High 71°, low 51°.

Pressure30.27 inHg

Wind1.6 mph NE

Humidity50%

Visibility6.2 mi

Dew point48°

Thu, 2272° / 48°

72 °

Mount Vernon, Thursday, 22 October

Clear. High 72°, low 48°.

Pressure30.24 inHg

Wind5 mph NE

Humidity42%

Visibility—

Dew point44°

Fri, 2374° / 51°

74 °

Mount Vernon, Friday, 23 October

Clear. High 74°, low 51°.

Pressure30.24 inHg

Wind6.9 mph E

Humidity33%

Visibility—

Dew point38°

Sat, 2477° / 52°

77 °

Mount Vernon, Saturday, 24 October

Overcast. High 77°, low 52°.

Pressure30.30 inHg

Wind6.6 mph S

Humidity24%

Visibility—

Dew point32°

Sun, 2577° / 57°

77 °

Mount Vernon, Sunday, 25 October

Overcast. High 77°, low 57°.

Pressure30.24 inHg

Wind14.6 mph SW

Humidity31%

Visibility—

Dew point41°

Mon, 2680° / 59°

80 °

Mount Vernon, Monday, 26 October

Overcast. High 80°, low 59°.

Pressure30.15 inHg

Wind11.2 mph SW

Humidity30%

Visibility—

Dew point42°

Tue, 2768° / 55°

68 °

Mount Vernon, Tuesday, 27 October

Overcast. High 68°, low 55°.

Pressure30.21 inHg

Wind14.5 mph NE

Humidity64%

Visibility—

Dew point54°

Wed, 2867° / 46°

67 °

Mount Vernon, Wednesday, 28 October

Mostly clear. High 67°, low 46°.

Pressure30.24 inHg

Wind12.3 mph E

Humidity40%

Visibility—

Dew point37°

Thu, 2977° / 55°

0.04

77 °

Mount Vernon, Thursday, 29 October

Light rain. High 77°, low 55°.

Pressure30.00 inHg

Wind17.8 mph SW

Humidity53%

Visibility—

Dew point50°

Fri, 3079° / 64°

79 °

Mount Vernon, Friday, 30 October

Overcast. High 79°, low 64°.

Pressure29.91 inHg

Wind21.5 mph S

Humidity47%

Visibility—

Dew point55°

Sat, 3174° / 64°

0.3

74 °

Mount Vernon, Saturday, 31 October

Rain. High 74°, low 64°.

Pressure29.94 inHg

Wind23.7 mph SW

Humidity82%

Visibility—

Dew point66°

Sun, 0176° / 61°

0.07

76 °

Mount Vernon, Sunday, 1 November

Light rain. High 76°, low 61°.

Pressure30.12 inHg

Wind13.3 mph S

Humidity76%

Visibility—

Dew point65°

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.