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Mountain, IL Weather Forecast

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Mountain, IL Weather Forecast

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Mountain IL weather - Lightning Observed - 80°F
Lightning Observed
80°F
Updated 3:45 pm
Feels Like 74°F
Humidity 39%
Wind N 12 mph
Barometer  30.11 in
Dew Point 53°F
Mountain IL weather - Lightning Observed - 27°C
Lightning Observed
27°C
Updated 3:45 pm
Feels Like 23°C
Humidity 39%
Wind N 19 km/h
Barometer  102 kPa
Dew Point 12°C
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Mountain Weather Forecast

THIS AFTERNOON TONIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT
Mountain, IL Weather - This Afternoon Mostly Sunny Mountain, IL Weather - Tonight Mostly Cloudy Mountain, IL Weather - Monday Chance Of T-Storm Mountain, IL Weather - Monday Night Mostly Clear Mountain, IL Weather - Tuesday Chance Of T-Storm Mountain, IL Weather - Tuesday Night Thunderstorms Mountain, IL Weather - Wednesday Thunderstorms Mountain, IL Weather - Wednesday Night Chance Of T-Storm Mountain, IL Weather - Thursday Chance Of T-Storm Mountain, IL Weather - Thursday Night Chance Of Showers Mountain, IL Weather - Friday Chance Of T-Storm Mountain, IL Weather - Friday Night Chance Of T-Storm
Mostly Sunny Mostly Cloudy Chance of T-Storm Mostly Clear Chance of T-Storm Thunderstorms Thunderstorms Chance of T-Storm Chance of T-Storm Chance of Showers Chance of T-Storm Chance of T-Storm
Hi: 79°FHi: 26°C
 Lo: 60°FLo: 16°C Hi: 81°FHi: 27°C
 Lo: 71°FLo: 22°C Hi: 89°FHi: 32°C
 Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C		 Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C		 Lo: 70°FLo: 21°C Hi: 85°FHi: 29°C
 Lo: 69°FLo: 21°C Hi: 81°FHi: 27°C
Lo: 69°FLo: 21°C		 Hi: 81°FHi: 27°C
Lo: 69°FLo: 21°C
POP: 30% POP: 50% POP: 70% POP: 70% POP: 50% POP: 50% POP: 20% POP: 40% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 222 PM CDT Sun Sep 13 2026 Mountain, IL Weather - WeatherWorld.com

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Issued: 230 PM CDT Sun Sep 13 2026

Key Messages

  • Summertime heat and humidity returns Tuesday.
  • Chances of showers and thunderstorms each day are mainly confined to northeast Missouri and west-central Illinois.

Aviation

/18Z TAFS THROUGH 00Z TUESDAY/... Issued at 1212 PM CDT Sun Sep 13 2026

A few showers and thunderstorms are possible this afternoon in southeast Missouri, though south of the terminals. A better chance exists mid-late Monday morning in northeast Missouri and west-central Illinois. Have therefore added a PROB30 group at ...