New Castle Weather in September

September in New Castle averages 26°C (79°F) during the day and 16°C (61°F) at night. Quite a bit of rainfall is typical this month, with around 106 mm (4.2 in) on average. An umbrella is a good idea.

Rainfall in New Castle in September

Expect around 8 days of rain based on historical data, with 106 mm (4.2 in) average. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in New Castle in September

In September, New Castle gets high temperatures, with highs of 26°C (79°F). Nights cool to around 16°C (61°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 16°C (61°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in New Castle in September

There are approximately 218 hours of sunshine this month, resulting in mostly clear days.

Should you favor a climate that's both dry and comfortably warm, May typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.