New Castle Weather in August

What's the weather like in New Castle (Indiana) in August 2025?

The climate in New Castle during August can be summarized as warm, humid and a little damp.

August is in the summer in New Castle and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 15°C (59°F) is normal.

New Castle weather averages (imperial / metric)
Daytime temperature 27.8°C 82°F
Nightly temperature 14.9°C 58.7°F
Average temperature 21.3°C 70.3°F
Daily sunshine 9.8 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 9 days
Sea temperature 23.9°C 75°F
Humidity 73%
Windspeed 12.2kph 8 mph

On average August is the 6th wettest month of the year in New Castle with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.8 hours of sunshine per day.

August temperatures in New Castle

New Castle average temperature in August

August rainfall

New Castle average rain in August

August hourly sunshine

New Castle average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in New Castle in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

New Castle weather stats

New Castle weather statistics
Hottest month: July 28.4°C 83.1°F
Driest month: February 61mm 2.4ins
Sunniest month: July 10.5hrs
Coldest month: January -0°C 32°F
Wettest month: May 114mm 4.5ins
Map showing location of New Castle (39.92894, -85.37025) New Castle map pin © Google

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