Delaware Weather in September

September in Delaware brings high temperatures, with highs of 25°C (77°F) and nights dropping to 12°C (54°F). Rainfall is on the higher side this month, averaging around 84 mm (3.3 in), so keep a rain jacket handy.

Rainfall in Delaware in September

Past climate data indicates that roughly 10 days will see rain, totalling around 84 mm (3.3 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Delaware in September

September is a perfect month in Delaware, with 25°C (77°F) during the day and 12°C (54°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Delaware in September

The days are predominantly sunny, with an estimated total of around 212 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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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 Delaware's climate page.

Delaware Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 33%  

Precipitation 84 mm (3.3 in)  

Rainy days 10 days  

Humidity 69% *  

Sunshine 212 hours *  

Percentage Sunshine 57% *  

* Data from: Columbus, the United States of America (37 KM, 23 Miles).

What to Wear in Delaware in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Delaware in September

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

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

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 Delaware's climate page.

More climate data for Delaware

Temperature Rainfall Sunshine Humidity

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