New Castle, IL Weather Forecast

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New Castle, IL Weather Forecast

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New Castle IL weather  - Overcast - 54°F
Overcast
54°F
Updated 7:52 am
Feels Like 47°F
Humidity 92%
Wind NW 7 mph
Barometer  30.14 in
Dew Point 52°F
New Castle IL weather  - Overcast - 12°C
Overcast
12°C
Updated 7:52 am
Feels Like 9°C
Humidity 92%
Wind NW 11 km/h
Barometer  102 kPa
Dew Point 11°C

New Castle Weather Forecast

TODAY TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY TUESDAY WEDNESDAY THURSDAY
New Castle, IL Weather - Today Mostly Cloudy New Castle, IL Weather - Tonight Mostly Cloudy New Castle, IL Weather - Saturday Sunny New Castle, IL Weather - Saturday Night Clear New Castle, IL Weather - Sunday Sunny New Castle, IL Weather - Sunday Night Mostly Clear New Castle, IL Weather - Monday Mostly Clear New Castle, IL Weather - Tuesday Mostly Clear New Castle, IL Weather - Wednesday Mostly Clear New Castle, IL Weather - Thursday Mostly Clear
Mostly Cloudy Mostly Cloudy Sunny Clear Sunny Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear
Hi: 55°FHi: 13°C
Lo: 41°FLo: 5°C Hi: 60°FHi: 16°C
Lo: 35°FLo: 2°C Hi: 65°FHi: 18°C
Hi: 71°FHi: 22°C
Lo: 41°FLo: 5°C
Hi: 71°FHi: 22°C
Lo: 41°FLo: 5°C
Hi: 71°FHi: 22°C
Lo: 41°FLo: 5°C
Hi: 79°FHi: 26°C
Lo: 49°FLo: 9°C
Hi: 79°FHi: 26°C
Lo: 49°FLo: 9°C
POP = Probability of Precipitation.
Weather Outlook Updated: 432 AM CDT Fri Oct 16 2026 New Castle, IL Weather - WeatherWorld.com

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Issued: 617 AM CDT Fri Oct 16 2026

Key Messages

  • Dramatically cooler today as a strong cold front sweeps through. Highs are forecast 27 to 32 degrees colder than yesterday.
  • Saturday night still looks to have a high potential for a first frost across most of the CWA with overnight lows in the 30s.
  • Sunday kicks off a warming trend with highs returning back to around or slightly above normal by mid week amid dry and settled weather with warm days and cool nights.

Discussion

... Issued at 1257 AM CDT Fri Oct 16 2026

A very strong cold fro...