The highest day temperature in August 2025 was 96°F. The lowest night temperature was 59°F. The average values for day and night temperatures during August were 85.3°F и 68.0°F respectivly.

The average sea surface temperature in August 2025 for New Castle was 82.9°F. The maximum and minimum values were 78.8°F and 87.8°F respectively.

You can expect various weather conditions during August. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in August for New Castle is 1.3 in. It makes august one of the most rainy months of the year.

The average wind speed in August is 6.0 mph. It makes August one of the most windless months of the year for New Castle.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for New Castle in August is 7.8 hours.