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City of New Castle, INNew Castle, IN Weather Forecast
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New Castle Weather Forecast
| REST OF TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | 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 | Mostly Cloudy | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C |
| POP: 70% | POP: 20% | POP: 70% | POP: 50% | POP: 60% | POP: 40% | POP: 20% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1001 AM EDT Sat Sep 19 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1001 AM EDT Sat Sep 19 2026
Key Messages
- Hot temperatures will continue across parts of central Indiana again today, with afternoon heat indices near 100 far south.
- Scattered to numerous showers and storms will be around at times this weekend.
- An isolated severe storm with damaging winds is possible this afternoon and Sunday afternoon.
- Shower and storm chances persist for much of the time into early next week, with temperatures turning cooler next week
Discussion
(Today through Friday)... Issued at 252 AM EDT Sat Sep 19 2026
E...