As of 00:03 CDT

Weather in Mount Vernon, IL

45°

Mount Vernon, Monday, 19 October, 00:03

Clear. Feels like 43°. High 69°, low 40°.

Pressure30.39 inHg

Wind4.3 mph SE

Humidity85%

Visibility6.2 mi

Dew point40°

See detailed hourly forecast

Tue, 2070° / 43°

70 °

Mount Vernon, Tuesday, 20 October

Clear. High 70°, low 43°.

Pressure30.36 inHg

Wind2 mph E

Humidity47%

Visibility6.2 mi

Dew point47°

Wed, 2171° / 46°

71 °

Mount Vernon, Wednesday, 21 October

Clear. High 71°, low 46°.

Pressure30.30 inHg

Wind2 mph N

Humidity45%

Visibility6.2 mi

Dew point47°

Thu, 2270° / 47°

70 °

Mount Vernon, Thursday, 22 October

Clear. High 70°, low 47°.

Pressure30.30 inHg

Wind4.2 mph NE

Humidity50%

Visibility6.2 mi

Dew point48°

Fri, 2368° / 48°

68 °

Mount Vernon, Friday, 23 October

Clear. High 68°, low 48°.

Pressure30.33 inHg

Wind7.1 mph E

Humidity47%

Visibility—

Dew point44°

Sat, 2474° / 48°

74 °

Mount Vernon, Saturday, 24 October

Overcast. High 74°, low 48°.

Pressure30.36 inHg

Wind9 mph S

Humidity43%

Visibility—

Dew point44°

Sun, 2567° / 57°

67 °

Mount Vernon, Sunday, 25 October

Overcast. High 67°, low 57°.

Pressure30.33 inHg

Wind11.8 mph S

Humidity64%

Visibility—

Dew point51°

Mon, 2674° / 53°

74 °

Mount Vernon, Monday, 26 October

Overcast. High 74°, low 53°.

Pressure30.21 inHg

Wind10.6 mph S

Humidity39%

Visibility—

Dew point41°

Tue, 2765° / 54°

65 °

Mount Vernon, Tuesday, 27 October

Light rain. High 65°, low 54°.

Pressure30.12 inHg

Wind8.9 mph SW

Humidity36%

Visibility—

Dew point36°

Wed, 2869° / 56°

0.02

69 °

Mount Vernon, Wednesday, 28 October

Light rain. High 69°, low 56°.

Pressure30.12 inHg

Wind7.3 mph NE

Humidity60%

Visibility—

Dew point47°

Thu, 2973° / 58°

0.02

73 °

Mount Vernon, Thursday, 29 October

Light rain. High 73°, low 58°.

Pressure30.00 inHg

Wind13.1 mph SE

Humidity65%

Visibility—

Dew point59°

Fri, 3071° / 66°

0.26

71 °

Mount Vernon, Friday, 30 October

Light rain. High 71°, low 66°.

Pressure29.91 inHg

Wind16.2 mph S

Humidity82%

Visibility—

Dew point65°

Sat, 3167° / 61°

2.61

67 °

Mount Vernon, Saturday, 31 October

Heavy rain. High 67°, low 61°.

Pressure30.00 inHg

Wind14.6 mph SE

Humidity97%

Visibility—

Dew point63°

Sun, 0166° / 49°

0.68

66 °

Mount Vernon, Sunday, 1 November

Heavy rain. High 66°, low 49°.

Pressure29.97 inHg

Wind24.7 mph W

Humidity57%

Visibility—

Dew point40°

Mon, 0263° / 45°

63 °

Mount Vernon, Monday, 2 November

Clear. High 63°, low 45°.

Pressure30.06 inHg

Wind8.7 mph W

Humidity39%

Visibility—

Dew point34°

Tue, 0365° / 48°

65 °

Mount Vernon, Tuesday, 3 November

Overcast. High 65°, low 48°.

Pressure29.97 inHg

Wind13.1 mph S

Humidity39%

Visibility—

Dew point38°

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.