As of 21:34 CDT

Weather in Mount Vernon, IL

51°

Mount Vernon, Friday, 16 October, 21:34

Clear. Feels like 49°. High 65°, low 51°.

Pressure30.36 inHg

Wind3.4 mph N

Humidity83%

Visibility6.2 mi

Dew point46°

See detailed hourly forecast

Sat, 1759° / 43°

59 °

Mount Vernon, Saturday, 17 October

Clear. High 59°, low 43°.

Pressure30.53 inHg

Wind5.4 mph NE

Humidity51%

Visibility6.2 mi

Dew point38°

Sun, 1863° / 41°

63 °

Mount Vernon, Sunday, 18 October

Clear. High 63°, low 41°.

Pressure30.50 inHg

Wind7.2 mph SE

Humidity45%

Visibility6.2 mi

Dew point38°

Mon, 1969° / 43°

69 °

Mount Vernon, Monday, 19 October

Clear. High 69°, low 43°.

Pressure30.42 inHg

Wind2.2 mph S

Humidity42%

Visibility6.2 mi

Dew point42°

Tue, 2071° / 45°

71 °

Mount Vernon, Tuesday, 20 October

Clear. High 71°, low 45°.

Pressure30.36 inHg

Wind1.9 mph NE

Humidity43%

Visibility6.2 mi

Dew point44°

Wed, 2173° / 47°

73 °

Mount Vernon, Wednesday, 21 October

Clear. High 73°, low 47°.

Pressure30.27 inHg

Wind3.7 mph E

Humidity35%

Visibility—

Dew point39°

Thu, 2275° / 51°

75 °

Mount Vernon, Thursday, 22 October

Partly cloudy. High 75°, low 51°.

Pressure30.18 inHg

Wind5.2 mph E

Humidity30%

Visibility—

Dew point37°

Fri, 2377° / 54°

77 °

Mount Vernon, Friday, 23 October

Clear. High 77°, low 54°.

Pressure30.21 inHg

Wind7.5 mph E

Humidity25%

Visibility—

Dew point35°

Sat, 2478° / 54°

78 °

Mount Vernon, Saturday, 24 October

Overcast. High 78°, low 54°.

Pressure30.21 inHg

Wind6.4 mph S

Humidity21%

Visibility—

Dew point30°

Sun, 2576° / 57°

76 °

Mount Vernon, Sunday, 25 October

Overcast. High 76°, low 57°.

Pressure30.24 inHg

Wind9.9 mph N

Humidity30%

Visibility—

Dew point40°

Mon, 2674° / 55°

74 °

Mount Vernon, Monday, 26 October

Overcast. High 74°, low 55°.

Pressure30.27 inHg

Wind9.6 mph NE

Humidity40%

Visibility—

Dew point44°

Tue, 2780° / 57°

80 °

Mount Vernon, Tuesday, 27 October

Overcast. High 80°, low 57°.

Pressure30.15 inHg

Wind9.1 mph SW

Humidity34%

Visibility—

Dew point43°

Wed, 2868° / 56°

68 °

Mount Vernon, Wednesday, 28 October

Light rain. High 68°, low 56°.

Pressure30.06 inHg

Wind9.8 mph NE

Humidity73%

Visibility—

Dew point57°

Thu, 2961° / 51°

0.92

61 °

Mount Vernon, Thursday, 29 October

Heavy rain. High 61°, low 51°.

Pressure29.94 inHg

Wind15.8 mph S

Humidity92%

Visibility—

Dew point51°

Fri, 3076° / 54°

0.1

76 °

Mount Vernon, Friday, 30 October

Light rain. High 76°, low 54°.

Pressure29.62 inHg

Wind20.6 mph W

Humidity51%

Visibility—

Dew point55°

Sat, 3160° / 47°

60 °

Mount Vernon, Saturday, 31 October

Partly cloudy. High 60°, low 47°.

Pressure30.12 inHg

Wind17.7 mph NW

Humidity44%

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 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.