Dense Fog, Scattered Showers: Illinois Halloween Forecast

ILLINOIS — Halloween morning has dawned with some fitting fog and possible scattered showers, according to the National Weather Service.

A dense fog advisory will end for the area at 10 a.m. Monday, but there could be hazardous driving conditions due to the low visibility. Patchy fog could even persist through noon.

The high for Monday is 65 degrees, so trick-or-treaters shouldn't have to bundle up too much, but an umbrella may be necessary.

Scattered showers will stick around into the afternoon in towns east of Interstate 55, the weather service said. Once rain moves out of the area, weather will be dry and warm through mid-week.

On Monday afternoon, AccuWeather called for a "few showers" and gave a 60 percent chance of precipitation.

Although it will be in the mid-60s today, it is not the warmest Halloween on record. According to the weather service, the warmest Halloween for Chicago was in 1950, when it was 84 degrees.

The coldest Halloween was over a century ago, when lows hit 23 degrees on Halloween 1873, the weather service said.

Precipitation isn't too rare on Halloween, with measurable precipitation happening 35 percent of the time, according to the weather service. The wettest Halloween came in 1994, when it rained 2.26 inches.

Rain may be more common, but it has also snowed on a few Halloweens, too. Two Halloweens have seen measurable snow, with five other Halloween seeing trace amounts. The snowiest Halloween was just a few years ago in 2019, when it snowed 3.4 inches.