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St. John Weather Warning NWS WEATHER ALERT FOR THE SAINT JOHN, IN AREA - Issued: 1012 PM CDT Fri Sep 18 2026 St. John Weather Warning

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St. John, IN 7-Day Night Weather Forecast

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St. John, IN 7-Day Night Weather Forecast

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St. John IN weather - Clear - 65°F
Clear
65°F
Updated 3:21 am
Feels Like 62°F
Humidity 76%
Wind SE 9 mph
Barometer  30.01 in
Dew Point 58°F
St. John IN weather - Clear - 18°C
Clear
18°C
Updated 3:21 am
Feels Like 17°C
Humidity 76%
Wind SE 14 km/h
Barometer  101.6 kPa
Dew Point 14°C
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St. John IN Weather - 4:21 am
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St. John, IN Weather Forecast

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St. John, IN Weather Forecast Date: 120 AM CDT Sat Sep 19 2026

The area/counties/county of: Lake County In, including the cities of: Gary, Hammond, and Merrillville.
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Rest of Tonight... Cloudy. A chance of showers and thunderstorms late. Some thunderstorms May produce heavy rainfall late. Near steady temperature in the mid 60s. Southeast winds around 10 mph. Chance of precipitation 50%.

Saturday... Showers with thunderstorms likely in the morning, then a chance of showers and thunderstorms in the afternoon. Some thunderstorms May produce heavy rainfall in the morning. Humid with highs in the upper 70s. East winds 5 to 10 mph, becoming south in the afternoon. Chance of precipitation near 100%.

Saturday Night... Showers with thunderstorms likely. Humid with lows in the mid 60s. Southeast winds around 5 mph, becoming northwest after midnight. Chance of precipitation near 100%.

Sunday... A chance of thunderstorms in the morning. Showers likely. A slight chance of thunderstorms in the afternoon. Highs in the lower 70s. North winds 10 to 15 mph. Chance of precipitation 70%.

Sunday Night... Mostly cloudy. A chance of showers. Lows in the mid 50s. Northeast winds 10 to 15 mph. Chance of precipitation 40%.

Monday... Mostly cloudy with a 50% chance of showers. Highs in the mid 60s.

Monday Night... Mostly cloudy. Lows in the lower 50s.

Tuesday... Mostly cloudy with a 20% chance of showers. Highs in the mid 60s.

Tuesday Night... Mostly cloudy. Lows in the lower 50s.

Wednesday... Mostly cloudy. Highs in the mid 60s.

Wednesday Night... Mostly cloudy. Lows in the lower 50s.

Thursday... Mostly cloudy. Highs in the upper 60s.

Thursday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 50s.

POP = Probability of Precipitation

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