Measurements:
°C
°F
CURRENT WEATHER
10:28
New Castle
64°F
SW 6 mph
Feels like: 64°F
Precip: 5%
World Resorts USA New Castle Weather

7 Day Weather Forecast

09.15
tue
DAY
74°F
NW 5 mph
precip
1%
NIGHT
62°F
NW 5 mph
precip
16%
09.16
wed
DAY
78°F
N 6 mph
precip
3%
NIGHT
70°F
N 3 mph
precip
9%
09.17
thu
DAY
84°F
NE 8 mph
precip
3%
NIGHT
74°F
N 7 mph
precip
6%
09.18
fri
DAY
84°F
S 9 mph
precip
5%
NIGHT
70°F
SW 7 mph
precip
5%
09.19
sat
DAY
74°F
W 11 mph
precip
15%
NIGHT
70°F
N 11 mph
precip
16%
09.20
sun
DAY
78°F
E 8 mph
precip
27%
NIGHT
72°F
SW 6 mph
precip
47%
09.21
mon
DAY
66°F
W 9 mph
precip
24%
NIGHT
66°F
W 8 mph
precip
27%

New Castle Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for New Castle was 25.7°F. The maximum and minimum values were 24.3°F and 26.6°F respectively.

New Castle on the Weather Map

Best Time to Visit New Castle
The most sunny months:
November 17 days
October 16 days
June 15 days
The most warm months:
July 89.9 °F
August 86.4 °F
June 83.9 °F
Warmest sea temperature:
July 84.1 °F
August 83.4 °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
June 2 days
The most windy months:
March 9 mph
April 9 mph
January 8 mph
more details