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.

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For a detailed overview over the year and the best time to visit the United States of America, check out our New Castle's climate page.

New Castle Temperature in September

Min Temperature 16°C (61°F)  

Max Temperature 26°C (79°F)  

Chance of Rain 27%  

Precipitation 106 mm (4.2 in)  

Rainy days 8 days  

Humidity 72% *  

Sunshine 218 hours *  

Percentage Sunshine 59% *  

* Data from: Philadelphia, the United States of America (47 KM, 29 Miles).

What to Wear in New Castle in September

Warm but pleasant conditions in New Castle in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in New Castle in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our New Castle's climate page.

More climate data for New Castle

Temperature Rainfall Sunshine Humidity

See the full New Castle climate overview or explore weather in the United States of America.