Measurements:
°C
°F
CURRENT WEATHER
13:18
New Castle
76°F
SE 7 mph
Feels like: 76°F
Precip: 0%
World Resorts USA New Castle Weather

7 Day Weather Forecast

04.23
thu
DAY
76°F
SE 7 mph
precip
0%
NIGHT
60°F
SW 4 mph
precip
0%
04.24
fri
DAY
66°F
SW 3 mph
precip
0%
NIGHT
54°F
NW 6 mph
precip
0%
04.25
sat
DAY
52°F
NW 12 mph
precip
100%
NIGHT
46°F
W 7 mph
precip
100%
04.26
sun
DAY
48°F
SW 11 mph
precip
60%
NIGHT
42°F
W 4 mph
precip
0%
04.27
mon
DAY
60°F
NW 7 mph
precip
0%
NIGHT
46°F
NW 6 mph
precip
0%
04.28
tue
DAY
60°F
N 12 mph
precip
18%
NIGHT
56°F
NW 8 mph
precip
58%
04.29
wed
DAY
62°F
NE 6 mph
precip
100%
NIGHT
54°F
SE 9 mph
precip
0%

New Castle Sea Water Temperature in April, °F

Select Year: 2026 2025 2024

The average sea surface temperature in April 2026 for New Castle was 13.0°F. The maximum and minimum values were 9.7°F and 16.3°F respectively.

New Castle on the Weather Map

Best Time to Visit New Castle
The most sunny months:
November 17 days
October 16 days
September 15 days
The most warm months:
July 89.5 °F
August 86.0 °F
June 83.1 °F
Warmest sea temperature:
July 84.2 °F
August 83.3 °F
September 77.2 °F
The most cold months:
January 37.3 °F
February 40.7 °F
December 42.3 °F
The most rainy months:
July 3 days
August 3 days
April 3 days
The most windy months:
March 9 mph
April 9 mph
January 8 mph
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