The temperatures in New Castle in September are comfortable with low of 12°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in New Castle during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in New Castle in September 2025.
If you’re planning to visit New Castle in the near future, we highly recommend that you review the 14 day weather forecast for New Castle before you arrive.
Temperatures
24° / 12°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
130
mm
Sun Hours
6.7
Hrs
