Weather World
Mermet, IL 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Mermet, IL Weather Forecast
Mermet, IL Weather Forecast Date: 127 PM CDT Mon Sep 21 2026
The area/counties/county of: Johnson, including the city of Vienna.or toggle through each period.
This Afternoon... Mostly cloudy with a slight chance of showers and thunderstorms. Highs in the mid 80s. North winds around 5 mph. Chance of rain 20%.
Tonight... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. North winds around 5 mph.
Tuesday... Partly sunny. Highs in the upper 70s. North winds 5 to 10 mph.
Tuesday Night... Mostly cloudy. Lows in the upper 50s. North winds 5 to 10 mph.
Wednesday... Partly sunny. Highs in the upper 70s. North winds 5 to 10 mph.
Wednesday Night... Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.
Thursday... Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.
Thursday Night... Mostly clear. Lows in the upper 50s.
Friday... Partly cloudy. Highs in the upper 70s. Lows in the mid 50s.
Friday Night... Partly cloudy. Highs in the upper 70s. Lows in the mid 50s.
Saturday... Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.
Saturday Night... Mostly cloudy. Highs in the upper 70s. Lows in the mid 50s.
POP = Probability of Precipitation
Mermet Radar Loop
Use the map search tool if you want to place a location marker on the radar map...