The temperatures in New Castle in May are quite cold with temperatures between 9°C and 22°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in New Castle. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in New Castle in May 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
22° / 9°
Rainy Days
10
Snowy Days
0
Dry Days
21
Rainfall
172
mm
Sun Hours
5.7
Hrs
