As of 13:44 CDT

Weather in Mount Vernon, IL

62°

Mount Vernon, Sunday, 18 October, 13:44

Clear. Feels like 60°. High 62°, low 38°.

Pressure30.45 inHg

Wind6.9 mph E

Humidity43%

Visibility6.2 mi

Dew point39°

See detailed hourly forecast

Mon, 1967° / 40°

67 °

Mount Vernon, Monday, 19 October

Partly cloudy. High 67°, low 40°.

Pressure30.39 inHg

Wind2 mph SW

Humidity51%

Visibility6.2 mi

Dew point46°

Tue, 2069° / 46°

69 °

Mount Vernon, Tuesday, 20 October

Clear. High 69°, low 46°.

Pressure30.36 inHg

Wind2.3 mph NE

Humidity50%

Visibility6.2 mi

Dew point47°

Wed, 2170° / 46°

70 °

Mount Vernon, Wednesday, 21 October

Clear. High 70°, low 46°.

Pressure30.30 inHg

Wind1.5 mph E

Humidity47%

Visibility6.2 mi

Dew point48°

Thu, 2271° / 47°

71 °

Mount Vernon, Thursday, 22 October

Clear. High 71°, low 47°.

Pressure30.27 inHg

Wind2.7 mph NE

Humidity50%

Visibility6.2 mi

Dew point48°

Fri, 2369° / 49°

69 °

Mount Vernon, Friday, 23 October

Clear. High 69°, low 49°.

Pressure30.30 inHg

Wind7.8 mph SE

Humidity47%

Visibility—

Dew point45°

Sat, 2480° / 54°

80 °

Mount Vernon, Saturday, 24 October

Overcast. High 80°, low 54°.

Pressure30.33 inHg

Wind10.8 mph S

Humidity29%

Visibility—

Dew point40°

Sun, 2577° / 57°

77 °

Mount Vernon, Sunday, 25 October

Overcast. High 77°, low 57°.

Pressure30.36 inHg

Wind14.5 mph SW

Humidity32%

Visibility—

Dew point41°

Mon, 2674° / 55°

74 °

Mount Vernon, Monday, 26 October

Overcast. High 74°, low 55°.

Pressure30.27 inHg

Wind8.4 mph SW

Humidity30%

Visibility—

Dew point37°

Tue, 2777° / 56°

77 °

Mount Vernon, Tuesday, 27 October

Overcast. High 77°, low 56°.

Pressure30.21 inHg

Wind10 mph SE

Humidity28%

Visibility—

Dew point38°

Wed, 2874° / 62°

0.17

74 °

Mount Vernon, Wednesday, 28 October

Rain. High 74°, low 62°.

Pressure30.00 inHg

Wind16.7 mph S

Humidity75%

Visibility—

Dew point59°

Thu, 2983° / 65°

0.08

83 °

Mount Vernon, Thursday, 29 October

Light rain. High 83°, low 65°.

Pressure29.80 inHg

Wind13.6 mph SW

Humidity64%

Visibility—

Dew point62°

Fri, 3084° / 63°

0.04

84 °

Mount Vernon, Friday, 30 October

Light rain. High 84°, low 63°.

Pressure29.74 inHg

Wind20.2 mph SE

Humidity46%

Visibility—

Dew point58°

Sat, 3170° / 51°

0.46

70 °

Mount Vernon, Saturday, 31 October

Rain. High 70°, low 51°.

Pressure29.83 inHg

Wind18.1 mph W

Humidity39%

Visibility—

Dew point36°

Sun, 0157° / 41°

57 °

Mount Vernon, Sunday, 1 November

Clear. High 57°, low 41°.

Pressure30.24 inHg

Wind10.7 mph W

Humidity28%

Visibility—

Dew point22°

Mon, 0261° / 39°

61 °

Mount Vernon, Monday, 2 November

Clear. High 61°, low 39°.

Pressure30.42 inHg

Wind7.4 mph SE

Humidity28%

Visibility—

Dew point23°

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.