New Castle weather
Best months for weather: May–Oct. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for New Castle, Pennsylvania, United States.
Best Time to Visit
Peak season May–OctOff season Nov–Mar
New Castle weather by month
When is the best time to visit New Castle?
Based on weather alone, the best time to visit New Castle is May–Oct, according to NASA's 2001–2025 climate averages. Nov–Mar tends to be the least pleasant. Average highs run from 0°C (33°F) in January to 29°C (85°F) in July.
What is the rainiest month in New Castle?
June is the wettest month, with about 102 mm (4.0 in) of rain on average. February is the driest, with about 63 mm (2.5 in).
What is the hottest month in New Castle?
July is the warmest, with average highs of 29°C (85°F) and lows of 17°C (62°F). January is the coolest, with highs of 0°C (33°F) and lows of -7°C (19°F).
Does New Castle have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is June at about 102 mm (4.0 in).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months