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As of 16:38 CDT

Weather in Mount Vernon, IL

80°Current weather

Mount Vernon, Thursday, 15 October, 16:38

Overcast. Feels like 80°. High 80°, low 68°.

Pressure29.91 inHg
Wind6.9 mph W
Humidity85%
Visibility4.9 mi
Dew point75°
Fri, 1670° / 51°0.01Light rain
70 °Light rain

Mount Vernon, Friday, 16 October

Light rain. High 70°, low 51°.

Pressure30.18 inHg
Wind17.6 mph NW
Humidity45%
Visibility6.2 mi
Dew point37°
Sat, 1758° / 45°0Clear
58 °Clear

Mount Vernon, Saturday, 17 October

Clear. High 58°, low 45°.

Pressure30.56 inHg
Wind6.6 mph NE
Humidity51%
Visibility6.2 mi
Dew point38°
Sun, 1863° / 41°0Clear
63 °Clear

Mount Vernon, Sunday, 18 October

Clear. High 63°, low 41°.

Pressure30.50 inHg
Wind7.4 mph SE
Humidity48%
Visibility6.2 mi
Dew point39°
Mon, 1968° / 43°0Clear
68 °Clear

Mount Vernon, Monday, 19 October

Clear. High 68°, low 43°.

Pressure30.39 inHg
Wind4 mph S
Humidity47%
Visibility6.2 mi
Dew point43°
Tue, 2070° / 45°0Partly cloudy
70 °Partly cloudy

Mount Vernon, Tuesday, 20 October

Partly cloudy. High 70°, low 45°.

Pressure30.33 inHg
Wind3.1 mph E
Humidity38%
Visibility—
Dew point39°
Wed, 2173° / 48°0Clear
73 °Clear

Mount Vernon, Wednesday, 21 October

Clear. High 73°, low 48°.

Pressure30.30 inHg
Wind6.4 mph E
Humidity37%
Visibility—
Dew point41°
Thu, 2276° / 53°0Clear
76 °Clear

Mount Vernon, Thursday, 22 October

Clear. High 76°, low 53°.

Pressure30.24 inHg
Wind7.4 mph SE
Humidity29%
Visibility—
Dew point37°
Fri, 2378° / 54°0Overcast
78 °Overcast

Mount Vernon, Friday, 23 October

Overcast. High 78°, low 54°.

Pressure30.18 inHg
Wind9.9 mph SE
Humidity30%
Visibility—
Dew point40°
Sat, 2480° / 60°0Overcast
80 °Overcast

Mount Vernon, Saturday, 24 October

Overcast. High 80°, low 60°.

Pressure30.21 inHg
Wind10.1 mph S
Humidity31%
Visibility—
Dew point43°
Sun, 2580° / 62°0Overcast
80 °Overcast

Mount Vernon, Sunday, 25 October

Overcast. High 80°, low 62°.

Pressure30.36 inHg
Wind7.4 mph E
Humidity33%
Visibility—
Dew point45°
Mon, 2679° / 57°0Mostly clear
79 °Mostly clear

Mount Vernon, Monday, 26 October

Mostly clear. High 79°, low 57°.

Pressure30.36 inHg
Wind10 mph E
Humidity35%
Visibility—
Dew point45°
Tue, 2775° / 55°0Overcast
75 °Overcast

Mount Vernon, Tuesday, 27 October

Overcast. High 75°, low 55°.

Pressure30.27 inHg
Wind10.9 mph S
Humidity27%
Visibility—
Dew point36°
Wed, 2878° / 56°0Overcast
78 °Overcast

Mount Vernon, Wednesday, 28 October

Overcast. High 78°, low 56°.

Pressure30.27 inHg
Wind11 mph S
Humidity31%
Visibility—
Dew point41°
Thu, 2978° / 53°0Partly cloudy
78 °Partly cloudy

Mount Vernon, Thursday, 29 October

Partly cloudy. High 78°, low 53°.

Pressure30.12 inHg
Wind13.3 mph SW
Humidity37%
Visibility—
Dew point46°
Fri, 3066° / 53°0.07Light rain
66 °Light rain

Mount Vernon, Friday, 30 October

Light rain. High 66°, low 53°.

Pressure30.21 inHg
Wind15.8 mph N
Humidity85%
Visibility—
Dew point55°

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.