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United StatesThe weather in September in Delaware
It's warm in September in Delaware with an average temperature of 23°C. Temperatures this month range from a low of 17°C to a high of 26°C. At night, you can expect temperatures between 10°C and 15°C.
Looking for sun? September isn’t a good month to be in Delaware. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Delaware, New York. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 33°C in 2018, Delaware reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 11°C in 2016. The extreme nighttime temperatures ranged from a lowest recorded value of -1°C to a highest value of 22°C.
Rainfall amount
In September, there is an average of 142 mm of precipitation, spread over 17 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for Delaware
Click on any day in September to get detailed info about the usual weather on that day in Delaware. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Delaware | New York | |
|---|---|---|
| Average temperature | 23°C | 27°C |
| Max. temperature | 26°C | 31°C |
| Min. temperature | 10°C | -5°C |
| Total precipitation | 142 mm | 57 mm |
| Rainy days | 17 days | 9 days |
Start of September
The month of September starts in Delaware with warm temps, averaging around 25°C during the day and nights around 14°C.
Mid September
By mid-September, daytime temps drop to around 23°C, with nights around 12°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Delaware is around 22°C, while nighttime temps are about 11°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Delaware for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Delaware, New York. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Delaware
Temperature in September in Delaware over the years
Precipitation charts
These charts show the average amount of precipitation in September in Delaware, New York. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Delaware
Total precipitation in September in Delaware over the years
Daily UV index in September in Delaware
This chart shows the average daily UV index in September in Delaware, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Delaware
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Average weather in Delaware by month
Click on a month below to see detailed weather info for Delaware. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.