The highest day temperature in July 2025 was 104°F. The lowest night temperature was 66°F. The average values for day and night temperatures during July were 92.8°F и 75.2°F respectivly.

The average sea surface temperature in July 2025 for New Castle was 84.6°F. The maximum and minimum values were 81.6°F and 87.4°F respectively.

Most of the days in July are cloudy but you can also expect sunny or gloomy days.

Precipitation total in July for New Castle is 1.5 in. It makes july the most rainy month of the year.

The average wind speed in July is 5.7 mph. It makes July the most windless month 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 July is 8.7 hours.