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St. John Weather Warning NWS WEATHER ALERT FOR THE SAINT JOHN, IN AREA - Issued: 339 AM CDT Mon Sep 14 2026 St. John Weather Warning

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St. John, IN Weather Forecast

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St. John, IN Weather Forecast

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St. John IN weather - Clear - 69°F
Clear
69°F
Updated 11:40 am
Feels Like 60°F
Humidity 41%
Wind SE 12 mph
Barometer  30.27 in
Dew Point 45°F
St. John IN weather - Clear - 21°C
Clear
21°C
Updated 11:40 am
Feels Like 16°C
Humidity 41%
Wind SE 19 km/h
Barometer  102.5 kPa
Dew Point 7°C
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St. John Weather Forecast

REST OF TODAY TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT
St. John, IN Weather - Rest Of Today Partly Cloudy St. John, IN Weather - Tonight Partly Cloudy St. John, IN Weather - Tuesday Chance Of T-Storm St. John, IN Weather - Tuesday Night Chance Of T-Storm St. John, IN Weather - Wednesday Chance Of T-Storm St. John, IN Weather - Wednesday Night Chance Of T-Storm St. John, IN Weather - Thursday Chance Of T-Storm St. John, IN Weather - Thursday Night Chance Of Showers St. John, IN Weather - Friday Mostly Cloudy St. John, IN Weather - Friday Night Chance Of Showers St. John, IN Weather - Saturday Chance Of Showers St. John, IN Weather - Saturday Night Chance Of Showers
Partly Cloudy Partly Cloudy Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of Showers Mostly Cloudy Chance of Showers Chance of Showers Chance of Showers
Hi: 75°FHi: 24°C
 Lo: 65°FLo: 18°C Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C Hi: 79°FHi: 26°C
 Lo: 70°FLo: 21°C Hi: 81°FHi: 27°C
 Lo: 65°FLo: 18°C Hi: 80°FHi: 27°C
 Lo: 65°FLo: 18°C Hi: 79°FHi: 26°C
 Lo: 61°FLo: 16°C
POP: 60% POP: 70% POP: 70% POP: 50% POP: 50% POP: 20% POP: 50% POP: 50% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 1005 AM CDT Mon Sep 14 2026 St. John, IN Weather - WeatherWorld.com

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Issued: 647 AM CDT Mon Sep 14 2026

Key Messages

  • Waves of heavy rain producing thunderstorms possible in the general region Tuesday through Thursday.

Discussion

... Issued at 322 AM CDT Mon Sep 14 2026

The core of a 1020 mb surface high pressure system is shifting across the western Great Lakes early this morning. Light winds, clear skies, and a drier air mass beneath the high have allowed temperatures to drop into the 40s, especially west of the Fox Valley in northern Illinois. Shallow ground fog has developed in places and will like...