Weather forecast for todayMount Vernon, IL

Weather forecast for today

Current condition 2:56 am CDT

  • 37°F
  • Feels like:
    37°F
Fog
Fog
  • Precipitation: 0"
  • Wind: 0mphWNW 290°
  • Humidity: 94%
  • Dewpoint: 36°F
  • Pressure: 30.49"Hg
  • Visibility: 1mi
  • UV index: 0
  • ▼
In Mount Vernon, at the moment, humid conditions have led to the formation of dense fog across the area.
The temperature is a wintry 37.4°F. The current temperature is almost at the minimum-predicted 35.6°F for today.

Sunday Oct 18, 2026

  • 66°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 7mphSE 144°
  • Humidity: 51%
  • UV index: 5
  • Sunrise: 7:07 am CDT
  • Sunset: 6:13 pm CDT
  • ▼
On Sunday, in Mount Vernon, bright and sunny weather is expected.
The day's temperature scale will range from a significant high of a breezy 66.2°F to a minimum of a cold 35.6°F.
The expected peak temperature will reflect the average October high of 66.4°F.
Sunrise will be at 7:07 am and sunset at 6:13 pm; the daylight will last for 11h and 6min.

Hourly overview

Hourly temperatures

Warmest hour: 3 pm 66°C.
Coldest hour: 6 am 36°C.

Chance of precipitation

Highest chance: 3 am 15%.

Hourly weather forecast

  • 4 am
  • 36°F
  • Feels like:
    36°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 0mphS 180°
  • Humidity: 95%
  • Pressure: 30.47"Hg
  • Visibility: 8mi
  • UV index: 0
  • ▼
  • 6 am
  • 36°F
  • Feels like:
    36°F
Clear
Clear
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphESE 121°
  • Humidity: 91%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunrise: 7:07 am
  • 8 am
  • 39°F
  • Feels like:
    39°F
Sunny
Sunny
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphSE 133°
  • Humidity: 90%
  • Pressure: 30.5"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 am
  • 54°F
  • Feels like:
    52°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSE 146°
  • Humidity: 57%
  • Pressure: 30.5"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 12 pm
  • 61°F
  • Feels like:
    59°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphSSE 149°
  • Humidity: 42%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 5
  • ▼
  • 2 pm
  • 64°F
  • Feels like:
    64°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSSE 148°
  • Humidity: 35%
  • Pressure: 30.42"Hg
  • Visibility: 10mi
  • UV index: 4
  • ▼
  • 4 pm
  • 66°F
  • Feels like:
    66°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSE 146°
  • Humidity: 33%
  • Pressure: 30.36"Hg
  • Visibility: 10mi
  • UV index: 1
  • ▼
  • 6 pm
  • 61°F
  • Feels like:
    61°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphSE 138°
  • Humidity: 43%
  • Pressure: 30.36"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:13 pm
  • 8 pm
  • 50°F
  • Feels like:
    50°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 2mphESE 114°
  • Humidity: 69%
  • Pressure: 30.39"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 46°F
  • Feels like:
    46°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphESE 116°
  • Humidity: 81%
  • Pressure: 30.39"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Today, primarily mostly clear and occasionally cloudy weather is anticipated.
The temperature will be between the highest temperature of 66.2°F and the lowest temperature of 35.6°F. The warmest part of the day will be at 3 pm and 4 pm.
The temperature today will be alike with the average high in October. Forecast models suggest a low more close to November's typical minimum of 37.9°F than October's usual 49.1°F.
Updated: Oct 18, 2026 @ 07:56:59 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Currently (2:56 am CDT) it is 37.4°F in Mount Vernon.

Today, sunny skies and pleasant visibility are expected.

Today, the highest temperature will be 66.2°F, while the lowest temperature will be 35.6°F.
Today, the maximum temperature will be in line with the average highest temperature in October. Today, the lowest temperature will be significantly lower than the average low of 49.1°F.

On Sunday, in Mount Vernon, sunrise will be at 7:07 am and sunset at 6:13 pm (CDT).

In Mount Vernon, today, there will be 11h and 6min of daylight.