Weather World
Newcastle, IL 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Newcastle Weather Forecast
Newcastle, IL Weather Forecast Date: 917 PM CDT Thu Sep 17 2026
Weather forecast for Newcastle, IL
Tonight Lo: 75°F Lo: 24°C |
Tonight... Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph this evening, becoming light and variable. |
Fri Hi: 99°FHi: 37°C Lo: 71°F Lo: 22°C |
Friday... Sunny, hot with highs in the upper 90s. Calm winds, becoming northwest around 5 mph in the afternoon. |
| Sat Hi: 99°FHi: 37°C Lo: 70°F Lo: 21°C |
Saturday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. |
Sun Hi: 99°FHi: 37°C Lo: 70°F Lo: 21°C |
Sunday... Partly cloudy. Hot. Highs in the upper 90s. Lows around 70. |
| Mon Hi: 91°FHi: 33°C Lo: 65°F Lo: 18°C |
Monday... Mostly sunny. Highs in the lower 90s. |
| Tue Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Tuesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Wed Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Wednesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
| Thu Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Thursday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s. |
Newcastle Radar Loop
Use the map search tool if you want to place a location marker on the radar map...